Publications (95)
The Leggett-Garg inequality in electron interferometers
Clive Emary, Neill Lambert, Franco Nori
We consider the violation of the Leggett-Garg inequality in electronic Mach-Zehnder inteferometers. This set-up has two distinct advantages over earlier quantum-transport proposals…
Photon-energy-programmable subnanometric electron birth-site control
Hirofumi Yanagisawa, Abhisek Sinha, Ravi Kumar +2
Optical control of electron-generation sites has broadly enabled ultrafast nanoscale imaging, spectroscopy, and functional control. Existing approaches achieve nanoscale site selec…
The Closed and Open Unbalanced Dicke Trimer Model: Critical Properties and Nonlinear Semiclassical Dynamics
Cheng Zhang, Pengfei Liang, Neill Lambert +1
We study a generalization of a recently introduced Dicke trimer model [Phys. Rev. Lett. 128, 163601, Phys. Rev. Research 5, L042016], which allows for cavity losses and unbalanced…
Temporal Steering in Four Dimensions with applications to coupled qubits and magnetoreception
Huan-Yu Ku, Shin-Liang Chen, Hong-Bin Chen +3
Einstein-Podolsky-Rosen (EPR) steering allows Alice to remotely prepare a state in some specific bases for Bob through her choice of measurements. The temporal analogue of EPR stee…
Exact description of fermionic reservoirs via purified damped ancillary fermions
Pengfei Liang, Neill Lambert, Mauro Cirio
We present a method for the modeling of fermionic reservoirs using a new class of ancillary damped fermions, dubbed purified pseudofermions, which exhibit unusual free correlations…
Experimental simulation of postselected closed timelike curves for decoding scrambled quantum information
Yi-Te Huang, Hsiang-Wei Huang, Jhen-Dong Lin +5
Quantum information scrambling (QIS) describes the rapid spread of initially localized information across an entire quantum many-body system through entanglement generation. Once s…
Radical-pair model of magnetoreception with spin-orbit coupling
Neill Lambert, Simone De Liberato, Clive Emary +1
The mechanism used by migratory birds to orientate themselves using the geomagnetic field is still a mystery in many species. The radical pair mechanism, in which very weak magneti…
Energy transfer in structured and unstructured environments: master equations beyond the Born-Markov approximations
Jake Iles-Smith, Arend G. Dijkstra, Neill Lambert +1
We explore excitonic energy transfer dynamics in a molecular dimer system coupled to both structured and unstructured oscillator environments. By extending the reaction coordinate…
Distinguishing quantum and classical transport through nanostructures
Neill Lambert, Clive Emary, Yueh-Nan Chen +1
We consider the question of how to distinguish quantum from classical transport through nanostructures. To address this issue we have derived two inequalities for temporal correlat…
Strongly-coupled non-Markovian waveguide QED with input-output HEOM
Neill Lambert, Yi-Te Huang, Yueh-Nan Chen +2
We consider the problem of modeling a single qubit in contact with a one-dimensional waveguide beyond the standard perturbative and Markovian approximations. Using the recently dev…
Quantum simulation of photosynthetic energy transfer
Bi-Xue Wang, Ming-Jie Tao, Qing Ai +7
Near-unity energy transfer efficiency has been widely observed in natural photosynthetic complexes. This phenomenon has attracted broad interest from different fields, such as phys…
Nonclassical Preparation of Quantum Remote States
Shih-Hsuan Chen, Yu-Chien Kao, Neill Lambert +2
Remote state preparation (RSP) enables a sender to remotely prepare the quantum state of a receiver without sending the state itself. Recently, it has been recognized that quantum…
Quantifying Quantumness of Channels Without Entanglement
Huan-Yu Ku, Josef Kadlec, AntonÃn Äernoch +8
Quantum channels breaking entanglement, incompatibility, or nonlocality are defined as such because they are not useful for entanglement-based, one-sided device-independent, or dev…
No-cloning of quantum steering
Ching-Yi Chiu, Neill Lambert, Teh-Lu Liao +2
Einstein-Podolsky-Rosen (EPR) steering allows two parties to verify their entanglement, even if one party's measurements are untrusted. This concept has not only provided new insig…
General bound on the performance of counter-diabatic driving acting on dissipative spin systems
Ken Funo, Neill Lambert, Franco Nori
Counter-diabatic driving (CD) is a technique in quantum control theory designed to counteract nonadiabatic excitations and guide the system to follow its instantaneous energy eigen…
Open quantum systems with local and collective incoherent processes: Efficient numerical simulation using permutational invariance
Nathan Shammah, Shahnawaz Ahmed, Neill Lambert +2
The permutational invariance of identical two-level systems allows for an exponential reduction in the computational resources required to study the Lindblad dynamics of coupled sp…
Quantifying Non-Markovianity with Temporal Steering
Shin-Liang Chen, Neill Lambert, Che-Ming Li +3
Einstein-Podolsky-Rosen (EPR) steering is a type of quantum correlation which allows one to remotely prepare, or steer, the state of a distant quantum system. While EPR steering ca…
Quantum transport in Cooper pair splitters using hierarchical equations of motion
Riya Baruah, Neill Lambert, Franco Nori +1
We investigate charge transport in Cooper pair splitters beyond the weak-coupling and Markovian limits. To this end, we employ hierarchical equations of motion (HEOM), which can ca…
A quantum-classical decomposition of Gaussian quantum environments: a stochastic pseudomode model
Si Luo, Neill Lambert, Pengfei Liang +1
We show that the effect of a Gaussian Bosonic environment linearly coupled to a quantum system can be simulated by a stochastic Lindblad master equation characterized by a set of a…
Superradiance with an ensemble of superconducting flux qubits
Neill Lambert, Yuichiro Matsuzaki, Kosuke Kakuyanagi +3
Superconducting flux qubits are a promising candidate for realizing quantum information processing and quantum simulations. Such devices behave like artificial atoms, with the adva…
HierarchicalEOM.jl: An efficient Julia framework for hierarchical equations of motion in open quantum systems
Yi-Te Huang, Po-Chen Kuo, Neill Lambert +5
The hierarchical equations of motion (HEOM) approach can describe the reduced dynamics of a system simultaneously coupled to multiple bosonic and fermionic environments. The comple…
Detecting Bose-Einstein condensation of exciton-polaritons via electron transport
Yueh-Nan Chen, Neill Lambert, Franco Nori
We examine the Bose-Einstein condensation of exciton-polaritons in a semiconductor microcavity via an electrical current. We propose that by embedding a quantum dot p-i-n junction…
Entanglement swapping and testing quantum steering into the past via collective decay
Yueh-Nan Chen, Shin-Liang Chen, Neill Lambert +3
We propose a scheme to realize entanglement swapping via superradiance, entangling two distant cavities without a direct interaction. The successful Bell-state-measurement outcomes…
A pseudo-fermion method for the exact description of fermionic environments: from single-molecule electronics to Kondo resonance
Mauro Cirio, Neill Lambert, Pengfei Liang +5
We develop a discrete fermion approach for modelling the strong interaction of an arbitrary system interacting with continuum electronic reservoirs. The approach is based on a pseu…
Dynamics of an ultra-strongly-coupled system interacting with a driven nonlinear resonator
Suguru Endo, Yuichiro Matsuzaki, Kosuke Kakuyanagi +3
In the ultra-strong coupling regime of a light-matter system, the ground state exhibits non-trivial entanglement between the atom and photons. For the purposes of exploring the mea…
Hierarchy in temporal quantum correlations
Huan-Yu Ku, Shin-Liang Chen, Neill Lambert +2
Einstein-Podolsky-Rosen (EPR) steering is an intermediate quantum correlation that lies in between entanglement and Bell non-locality. Its temporal analogue, temporal steering, has…
Revealing non-Markovian Kondo transport with waiting time distributions
Feng-Jui Chan, Po-Chen Kuo, Neill Lambert +2
We investigate non-Markovian transport dynamics and signatures of the Kondo effect in a single impurity Anderson model. The model consists of a quantum dot (QD) with ultra-strong c…
Securing quantum networking tasks with multipartite Einstein-Podolsky-Rosen steering
Chien-Ying Huang, Neill Lambert, Che-Ming Li +2
Einstein-Podolsky-Rosen (EPR) steering is the explicit demonstration of the fact that the measurements of one party can in influence the quantum state held by another, distant, par…
Hidden nonmacrorealism: reviving the Leggett-Garg inequality with stochastic operations
Huan-Yu Ku, Hao-Cheng Weng, Yen-An Shih +5
The Leggett-Garg inequality (LGI) distinguishes nonmacrorealistic channels from macrorealistic ones by constraining the experimental outcomes of the underlying system. In this work…
Bistable Photon Emission from a Solid-State Single-Atom Laser
Neill Lambert, Franco Nori, Christian Flindt
We predict a bistability in the photon emission from a solid-state single-atom laser comprising a microwave cavity coupled to a voltage-biased double quantum dot. To demonstrate th…
Superradiance with local phase-breaking effects
Nathan Shammah, Neill Lambert, Franco Nori +1
We study the superradiant evolution of a set of two-level systems spontaneously radiating under the effect of phase-breaking mechanisms. We investigate the dynamics generated b…
Tunable multiphonon blockade in coupled nanomechanical resonators
Adam Miranowicz, Jiri Bajer, Neill Lambert +2
A single phonon in a nonlinear nanomechanical resonator (NAMR) can block the excitation of a second phonon [Phys. Rev. A 82, 032101 (2010)]. This intrinsically quantum effect is ca…
Quantum limit of photothermal cooling
Simone De Liberato, Neill Lambert, Franco Nori
We study the problem of cooling a mechanical oscillator using the photothermal (bolometric) force. Contrary to previous attempts to model this system, we take into account the nois…
Surface plasmons in a metal nanowire coupled to colloidal quantum dots: Scattering properties and quantum entanglement
Guang-Yin Chen, Neill Lambert, Chung-Hsien Chou +2
We investigate coherent single surface-plasmon transport in a metal nanowire strongly coupled to two colloidal quantum dots. Analytical expressions are obtained for the transmissio…
Resource efficient certification of system environment entanglement solely from reduced system dynamics
Jhen-Dong Lin, Pao-Wen Tu, Kuan-Yi Lee +4
Certifying nonclassical correlations typically requires access to all subsystems, presenting a major challenge in open quantum systems coupled to inaccessible environments. Recent…
Unified single-photon and single-electron counting statistics: from cavity-QED to electron transport
Neill Lambert, Yueh-Nan Chen, Franco Nori
A key ingredient of cavity quantum-electrodynamics (QED) is the coupling between the discrete energy levels of an atom and photons in a single-mode cavity. The addition of periodic…
Rerouting Excitation Transfer in the Fenna-Matthews-Olson Complex
Guang-Yin Chen, Neill Lambert, Che-Ming Li +2
We investigate, using the Hierarchy method, the entanglement and the excitation transfer efficiency of the Fenna-Matthews-Olson complex under two different local modifications: the…
Pulse-level noisy quantum circuits with QuTiP
Boxi Li, Shahnawaz Ahmed, Sidhant Saraogi +4
The study of the impact of noise on quantum circuits is especially relevant to guide the progress of Noisy Intermediate-Scale Quantum (NISQ) computing. In this paper, we address th…
Electrical current and coupled electron-nuclear spin dynamics in double quantum dots
G. Giavaras, Neill Lambert, Franco Nori
We examine electronic transport in a spin-blockaded double quantum dot. We show that by tuning the strength of the spin-orbit interaction the current flowing through the double dot…
Modeling the unphysical pseudomode model with physical ensembles: simulation, mitigation, and restructuring of non-Markovian quantum noise
Mauro Cirio, Si Luo, Pengfei Liang +2
The influence of a Gaussian environment on a quantum system can be described by effectively replacing the continuum with a discrete set of ancillary quantum and classical degrees o…
Entangled-state generation and Bell inequality violations in nanomechanical resonators
J. Robert Johansson, Neill Lambert, Imran Mahboob +2
We investigate theoretically the conditions under which a multi-mode nanomechanical resonator, operated as a purely mechanical parametric oscillator, can be driven into highly nonc…
Vibrationally-mediated molecular transistors
D. H. Santamore, Neill Lambert, Franco Nori
We investigate the steady-state electronic transport through a suspended dimer molecule coupled to leads. When strongly coupled to a vibrational mode, the electron transport is enh…
Quantum chaos and critical behavior on a chip
Neill Lambert, Yueh-nan Chen, Robert Johannsson +1
The Dicke model describes N qubits (or two-level atoms) homogenously coupled to a bosonic mode. Here we examine an open-system realization of the Dicke model, which contains critic…
Shortcuts to Adiabatic Pumping in Classical Stochastic Systems
Ken Funo, Neill Lambert, Franco Nori +1
Adiabatic pumping is characterized by a geometric contribution to the pumped charge, which can be non-zero even in the absence of a bias. However, as the driving speed is increased…
Speeding-up a quantum refrigerator via counter-diabatic driving
Ken Funo, Neill Lambert, Bayan Karimi +3
We study the application of a counter-diabatic driving (CD) technique to enhance the thermodynamic efficiency and power of a quantum Otto refrigerator based on a superconducting qu…
Observation of a superradiant phase transition with emergent cat states
Ri-Hua Zheng, Wen Ning, Ye-Hong Chen +15
Superradiant phase transitions (SPTs) are important for understanding light-matter interactions at the quantum level, and play a central role in criticality-enhanced quantum sensin…
Collectively induced exceptional points of quantum emitters coupled to nanoparticle surface plasmons
Po-Chen Kuo, Neill Lambert, Adam Miranowicz +4
Exceptional points, resulting from non-Hermitian degeneracies, have the potential to enhance the capabilities of quantum sensing. Thus, finding exceptional points in different quan…
When do weak-coupling approaches accurately capture the dynamics of complex quantum systems?
Amir Fruchtman, Neill Lambert, Erik M. Gauger
Understanding the dynamics of higher-dimensional quantum systems embedded in a complex environment remains a significant theoretical challenge. While several approaches yielding nu…
Environmental dynamics, correlations, and the emergence of noncanonical equilibrium states in open quantum systems
Jake Iles-Smith, Neill Lambert, Ahsan Nazir
Quantum systems are invariably open, evolving under surrounding influences rather than in isolation. Standard open quantum system methods eliminate all information on the environme…
Non-Hermitian Pseudomodes for Strongly Coupled Open Quantum Systems: Unravelings, Correlations and Thermodynamics
Paul Menczel, Ken Funo, Mauro Cirio +2
The pseudomode framework provides an exact description of the dynamics of an open quantum system coupled to a non-Markovian environment. Using this framework, the influence of the…
Space-time dual quantum Zeno effect: Interferometric engineering of open quantum system dynamics
Jhen-Dong Lin, Ching-Yu Huang, Neill Lambert +3
Superposition of trajectories, which modify quantum evolutions by superposing paths through interferometry, has been utilized to enhance various quantum communication tasks. Howeve…
Kondo QED: The Kondo effect and photon trapping in a two-impurity Anderson model ultra-strongly coupled to light
Po-Chen Kuo, Neill Lambert, Mauro Cirio +3
The Kondo effect is one of the most studied examples of strongly correlated quantum many-body physics. Another type of strongly correlated physics that has only recently been explo…
QuTiP-BoFiN: A bosonic and fermionic numerical hierarchical-equations-of-motion library with applications in light-harvesting, quantum control, and single-molecule electronics
Neill Lambert, Tarun Raheja, Simon Cross +5
The "hierarchical equations of motion" (HEOM) method is a powerful exact numerical approach to solve the dynamics and find the steady-state of a quantum system coupled to a non-Mar…
RC-HEOM Hybrid Method for Non-Perturbative Open System Dynamics
Po-Rong Lai, Jhen-Dong Lin, Yi-Te Huang +3
The Hierarchical equations of motion (HEOM) method is an important non-perturbative technique, allowing numerically exact treatment of open quantum systems with strong coupling and…
Purified pseudomode model for nonlinear system-bath interactions
Cheng Zhang, Neill Lambert, Xin-Qi Li +2
The theory of purified pseudomodes [arXiv:2412.04264 (2024)] was recently developed to provide a numerical tool for the analysis of the properties of a quantum system and the envir…
Quantum steering as a witness of quantum scrambling
Jhen-Dong Lin, Wei-Yu Lin, Huan-Yu Ku +3
Quantum information scrambling describes the delocalization of local information to global information in the form of entanglement throughout all possible degrees of freedom. A nat…
Optimizing co-operative multi-environment dynamics in a dark-state-enhanced photosynthetic heat engine
Melina Wertnik, Alex Chin, Franco Nori +1
We analyze the role of coherent, non-perturbative system-bath interactions in a photosynthetic heat engine. Using the reaction-coordinate formalism to describe the vibrational phon…
Photon-mediated electron transport in hybrid circuit-QED
Neill Lambert, Christian Flindt, Franco Nori
We investigate photon-mediated transport processes in a hybrid circuit-QED structure consisting of two double quantum dots coupled to a common microwave cavity. Under suitable reso…
Detecting quantum-coherent nanomechanical oscillations using the current-noise spectrum of a double quantum dot
Neill Lambert, Franco Nori
We consider a nanomechanical resonator coupled to a double quantum dot. We demonstrate how the finite-frequency current noise spectrum through the double quantum dot can be used to…
Virtual excitations in the ultra-strongly-coupled spin-boson model: physical results from unphysical modes
Neill Lambert, Shahnawaz Ahmed, Mauro Cirio +1
Here we show how, in the ultra-strongly-coupled spin-boson model, apparently unphysical "Matsubara modes" are required not only to regulate detailed balance, but also to arrive at…
A temporal steering inequality
Yueh-Nan Chen, Che-Ming Li, Neill Lambert +4
Quantum steering is the ability to remotely prepare different quantum states by using entangled pairs as a resource. Very recently, the concept of steering has been quantified with…
Ground State Electroluminescence
Mauro Cirio, Simone De Liberato, Neill Lambert +1
Electroluminescence, the emission of light in the presence of an electric current, provides information on the allowed electronic transitions of a given system. It is commonly used…
Functional quantum biology in photosynthesis and magnetoreception
Neill Lambert, Yueh-Nan Chen, Yuan-Chung Cheng +3
Is there a functional role for quantum mechanics or coherent quantum effects in biological processes? While this question is as old as quantum theory, only recently have measuremen…
Certifying single-system steering for quantum information processing
Che-Ming Li, Yueh-Nan Chen, Neill Lambert +2
Einstein-Podolsky-Rosen (EPR) steering describes how different ensembles of quantum states can be remotely prepared by measuring one particle of an entangled pair. Here, we investi…
Witnessing Quantum Coherence: from solid-state to biological systems
Che-Ming Li, Neill Lambert, Yueh-Nan Chen +2
Quantum coherence is one of the primary non-classical features of quantum systems. While protocols such as the Leggett-Garg inequality (LGI) and quantum tomography can be used to t…
A purified input-output pseudomode model for structured open quantum systems
Pengfei Liang, Neill Lambert, Si Luo +2
A full understanding of open quantum systems requires the characterization of both system and environmental properties. However, the complexity of the environmental statistics in t…
Using non-Markovian measures to evaluate quantum master equations for photosynthesis
Hong-Bin Chen, Neill Lambert, Yuan-Chung Cheng +2
When dealing with system-reservoir interactions in an open quantum system, such as a photosynthetic light-harvesting complex, approximations are usually made to obtain the dynamics…
Entanglement in quantum catastrophes
Clive Emary, Neill Lambert, Tobias Brandes
We classify entanglement singularities for various two-mode bosonic systems in terms of catastrophe theory. Employing an abstract phase-space representation, we obtain exact result…
Delocalized single-photon Dicke states and the Leggett- Garg inequality in solid state systems
Guang-Yin Chen, Neill Lambert, Che-Ming Li +2
We show how to realize a single-photon Dicke state in a large one-dimensional array of two- level systems, and discuss how to test its quantum properties. Realization of single-pho…
Exact and efficient quantum simulation of open quantum dynamics for various of Hamiltonians and spectral densities
Na-Na Zhang, Ming-Jie Tao, Wan-Ting He +6
Recently, we have theoretically proposed and experimentally demonstrated an exact and efficient quantum simulation of photosynthetic light harvesting in nuclear magnetic resonance…
Amplified opto-mechanical transduction of virtual radiation pressure
Mauro Cirio, Kamanasish Debnath, Neill Lambert +1
Here we describe how, utilizing a time-dependent opto-mechanical interaction, a mechanical probe can provide an amplified measurement of the virtual photons dressing the quantum gr…
Plasmonic bio-sensing for the Fenna-Matthews-Olson complex
Guang-Yin Chen, Neill Lambert, Yen-An Shih +3
We study theoretically the bio-sensing capabilities of metal nanowire surface plasmons. As a specific example, we couple the nanowire to specific sites (bacteriochlorophyll) of the…
Increasing relative nonclassicality quantified by standard entanglement potentials by dissipation and unbalanced beam splitting
Adam Miranowicz, Karol Bartkiewicz, Neill Lambert +2
If a single-mode nonclassical light is combined with the vacuum on a beam splitter, then the output state is entangled. As proposed in [Phys. Rev. Lett. 94, 173602 (2005)], by meas…
Fixing detailed balance in ancilla-based dissipative state engineering
Neill Lambert, Mauro Cirio, Jhen-dong Lin +3
Dissipative state engineering is a general term for a protocol which prepares the ground state of a complex many-body Hamiltonian using engineered dissipation or engineered environ…
Multielectron Ground State Electroluminescence
Mauro Cirio, Nathan Shammah, Neill Lambert +2
The ground state of a cavity-electron system in the ultrastrong coupling regime is characterized by the presence of virtual photons. If an electric current flows through this syste…
Sudden change of the photon output field marks phase transitions in the quantum Rabi model
Ye-Hong Chen, Yuan Qiu, Adam Miranowicz +6
The experimental observation of quantum phase transitions predicted by the quantum Rabi model in quantum critical systems is usually challenging due to the lack of signature experi…
Amplified and tunable transverse and longitudinal spin-photon coupling in hybrid circuit-QED
Neill Lambert, Mauro Cirio, Matthieu Delbecq +4
We describe a method to tune, in-situ, between transverse and longitudinal light-matter coupling in a hybrid circuit-QED device composed of an electron spin degree of freedom coupl…
Nonequilibrium thermodynamics in the strong coupling and non-Markovian regime based on a reaction coordinate mapping
Philipp Strasberg, Gernot Schaller, Neill Lambert +1
We propose a method to study the thermodynamic behaviour of small systems beyond the weak coupling and Markovian approximation, which is different in spirit from conventional appro…
Non-Markovian skin effect
Po-Chen Kuo, Shen-Liang Yang, Neill Lambert +4
The Liouvillian skin effect and the non-Hermitian skin effect have both been used to explain the localization of eigenmodes near system boundaries, though the former is arguably mo…
Confidence and Backaction in the Quantum Filter Equation
Wei Cui, Neill Lambert, Yukihiro Ota +4
We study the confidence and backaction of state reconstruction based on a continuous weak measurement and the quantum filter equation. As a physical example we use the traditional…
Leggett-Garg Inequalities
Clive Emary, Neill Lambert, Franco Nori
In contrast to the spatial Bell's inequalities, which probe entanglement between spatially-separated systems, the Leggett-Garg inequalities test the correlations of a single system…
A macro-realism inequality for opto-electro-mechanical systems
Neill Lambert, Robert Johansson, Franco Nori
We show how to apply the Leggett-Garg inequality to opto-electro-mechanical systems near their quantum ground state. We find that by using a dichotomic quantum non-demolition measu…
Nonequilibrium heat transport and work with a single artificial atom coupled to a waveguide: emission without external driving
Yong Lu, Neill Lambert, Anton Frisk Kockum +5
We observe the continuous emission of photons into a waveguide from a superconducting qubit without the application of an external drive. To explain this observation, we build a tw…
Beyond Marcus theory and the Landauer-Buttiker approach in molecular junctions. II. A self-consistent Born approach
Jakub K. Sowa, Neill Lambert, Tamar Seideman +1
Marcus and Landauer-Buttiker approaches to charge transport through molecular junctions describe two contrasting mechanisms of electronic conduction. In previous work, we have show…
Leggett--Garg inequality violations with a large ensemble of qubits
Neill Lambert, Kamanasish Debnath, Anton Frisk Kockum +3
We investigate how discrete internal degrees of freedom in a quasi-macroscopic system affect the violation of the Leggett--Garg inequality, a test of macroscopic-realism based on t…
Unveiling and veiling a Schrödinger cat state from the vacuum
Roberto Stassi, Mauro Cirio, Ken Funo +3
Deep in the ultrastrong light-matter coupling regime, it has been predicted that the ground state of a two-level atom interacting with a cavity mode takes the form of a "virtual" S…
Lee-Yang theory of the superradiant phase transition in the open Dicke model
Fredrik Brange, Neill Lambert, Franco Nori +1
The Dicke model describes an ensemble of two-level atoms that are coupled to a confined light mode of an optical cavity. Above a critical coupling, the cavity becomes macroscopical…
The Fermionic influence superoperator: a canonical derivation for the development of methods to simulate the influence of a Fermionic environment on a quantum system with arbitrary parity symmetry
Mauro Cirio, Po-Chen Kuo, Yueh-Nan Chen +2
We present a canonical derivation of an influence superoperator which generates the reduced dynamics of a Fermionic quantum system linearly coupled to a Fermionic environment initi…
Detecting non-Markovian plasmonic band gaps in quantum dots using electron transport
Yueh-Nan Chen, Guang-Yin Chen, Ying-Yen Liao +2
Placing a quantum dot close to a metal nanowire leads to drastic changes in its radiative decay behavior because of evanescent couplings to surface plasmons. We show how two non-Ma…
Experimental test of non-macrorealistic cat-states in the cloud
Huan-Yu Ku, Neill Lambert, Fong-Ruei Jhan +3
The Leggett-Garg inequality attempts to classify experimental outcomes as arising from one of two possible classes of physical theories: those described by macrorealism (which obey…
QuTiP 5: The Quantum Toolbox in Python
Neill Lambert, Eric Giguère, Paul Menczel +15
QuTiP, the Quantum Toolbox in Python, has been at the forefront of open-source quantum software for the past 13 years. It is used as a research, teaching, and industrial tool, and…
Entanglement and the Phase Transition in Single Mode Superradiance
Neill Lambert, Clive Emary, Tobias Brandes
We consider the entanglement properties of the quantum phase transition in the single-mode superradiance model, involving the interaction of a boson mode and an ensemble of atoms.…
Spatio-Temporal Steering for Testing Nonclassical Correlations in Quantum Networks
Shin-Liang Chen, Neill Lambert, Che-Ming Li +4
We introduce the concept of spatio-temporal steering (STS), which reduces, in special cases, to Einstein-Podolsky-Rosen steering and the recently-introduced temporal steering. We d…
Non-Markovian Quantum Exceptional Points
Jhen-Dong Lin, Po-Chen Kuo, Neill Lambert +3
Exceptional points (EPs) are singularities in the spectra of non-Hermitian operators, where eigenvalues and eigenvectors coalesce. Recently, open quantum systems have been increasi…
Input-Output Hierarchical Equations Of Motion
Mauro Cirio, Pengfei Liang, Neill Lambert
We derive an extended version of the hierarchical equations of motion (HEOM) to compute output physical properties of a bosonic environment, which is allowed to be initially prepar…