Publications (60)
Coherence as a measure for non-Markovianity and its applications to color centers in diamond
Ariel Norambuena, Jerónimo R. Maze, Peter Rabl +1
The degree of non-Markovianity of a continuous bath can be quantified by means of the coherence. This simple measure is experimentally accessible through Ramsey spectroscopy, but i…
Emergence of PT-symmetry breaking in open quantum systems
Julian Huber, Peter Kirton, Stefan Rotter +1
The effect of PT-symmetry breaking in coupled systems with balanced gain and loss has recently attracted considerable attention and has been demonstrated in various photonic, elect…
The photon blockade effect in optomechanical systems
Peter Rabl
We analyze the photon statistics of a weakly driven optomechanical system and discuss the effect of photon blockade under single photon strong coupling conditions. We present an in…
Implementation of the Dicke lattice model in hybrid quantum system arrays
Liujun Zou, David Marcos, Sebastian Diehl +4
Generalized Dicke models can be implemented in hybrid quantum systems built from ensembles of nitrogen-vacancy (NV) centers in diamond coupled to superconducting microwave cavities…
Dynamically encircling exceptional points in a waveguide: asymmetric mode switching from the breakdown of adiabaticity
Jörg Doppler, Alexei A. Mailybaev, Julian Böhm +7
Physical systems with loss or gain feature resonant modes that are decaying or growing exponentially with time. Whenever two such modes coalesce both in their resonant frequency an…
Dynamical cluster-based strategy for improving tensor network algorithms in quantum circuit simulations
Andrea De Girolamo, Paolo Facchi, Peter Rabl +3
We optimize matrix-product state-based algorithms for simulating quantum circuits with finite fidelity, specifically the time-evolving block decimation (TEBD) and the density-matri…
Entangling microwaves with optical light
Rishabh Sahu, Liu Qiu, William Hease +4
Entanglement is a genuine quantum mechanical property and the key resource in currently developed quantum technologies. Sharing this fragile property between superconducting microw…
The Vacua of Dipolar Cavity Quantum Electrodynamics
Michael Schuler, Daniele De Bernardis, Andreas M. Läuchli +1
The structure of solids and their phases is mainly determined by static Coulomb forces while the coupling of charges to the dynamical, i.e., quantized degrees of freedom of the ele…
Hybrid quantum device with nitrogen-vacancy centers in diamond coupled to carbon nanotubes
Peng-Bo Li, Ze-Liang Xiang, Peter Rabl +1
We show that nitrogen-vacancy (NV) centers in diamond interfaced with a suspended carbon nanotube carrying a dc current can facilitate a spin-nanomechanical hybrid device. We demon…
Robust Superradiance and Spontaneous Spin Ordering in Disordered Waveguide Quantum Electrodynamics
Xin H. H. Zhang, Daniel Malz, Peter Rabl
We study the collective emission of a disordered array of excited two-level atoms into a one-dimensional photonic waveguide. In the perfectly ordered case, where atoms are spac…
Light-matter interactions in synthetic magnetic fields: Landau-photon polaritons
Daniele De Bernardis, Ze-Pei Cian, Iacopo Carusotto +2
We study light-matter interactions in two dimensional photonic systems in the presence of a spatially homogeneous synthetic magnetic field for light. Specifically, we consider one…
Boundary-induced Phases in the Dissipative Dicke Lattice Model
Peng-Fei Wei, Yilun Xu, Fengxiao Sun +3
The superradiant phase transition in the dissipative Dicke lattice model, driven by on-site collective atom-photon interactions and inter-site photon hopping, is a cornerstone of n…
Theory of Multi-photon Processes for Applications in Quantum Control
Longxiang Huang, Jacquelin Luneau, Johannes Schirk +5
We present a general theoretical framework for evaluating multi-photon processes in periodically driven quantum systems, which have been identified as a versatile tool for engineer…
Can we observe non-perturbative vacuum shifts in cavity QED?
RocÃo Sáez-Blázquez, Daniele de Bernardis, Johannes Feist +1
We address the fundamental question whether or not it is possible to achieve conditions under which the coupling of a single dipole to a strongly confined electromagnetic vacuum ca…
Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams
Joan AgustÃ, Yuri Minoguchi, Johannes M. Fink +1
We investigate the deterministic generation and distribution of entanglement in large quantum networks by driving distant qubits with the output fields of a non-degenerate parametr…
Theory of cavity-assisted microwave cooling of polar molecules
Margareta Wallquist, Peter Rabl, Mikhail D. Lukin +1
We analyze cavity-assisted cooling schemes for polar molecules in the microwave domain, where molecules are excited on a rotational transition and energy is dissipated via strong i…
Realistic simulations of spin squeezing and cooperative coupling effects in large ensembles of interacting two-level systems
Julian Huber, Ana Maria Rey, Peter Rabl
We describe an efficient numerical method for simulating the dynamics of interacting spin ensembles in the presence of dephasing and decay. The method builds on the discrete trunca…
Non-equilibrium magnetic phases in spin lattices with gain and loss
Julian Huber, Peter Kirton, Peter Rabl
We study the magnetic phases of a non-equilibrium spin chain, where coherent interactions between neighboring lattice sites compete with alternating gain and loss processes. This c…
Enabling Deterministic Passive Quantum State Transfer with Giant Atoms
Oliver Diekmann, Enrico Di Benedetto, Nicolas Jungwirth +7
Achieving quantum state transfer in passive ways can become a powerful asset for scalable quantum networks. Here, we demonstrate how giant atoms coupled to 1D waveguides provide a…
Breakdown of gauge invariance in ultrastrong-coupling cavity QED
Daniele De Bernardis, Philipp Pilar, Tuomas Jaako +2
We revisit the derivation of Rabi- and Dicke-type models, which are commonly used for the study of quantum light-matter interactions in cavity and circuit QED. We demonstrate that…
Driven two-level systems as a minimal resource for remote entanglement stabilization
Philippe Gigon, Adrian Parra-Rodriguez, Joan Agustà +1
We analyze the autonomous stabilization of remote entanglement by driving two distant qubits with the output of a correlated photon source. By treating the qubits as idealized enta…
Unraveling superradiance: Entanglement and mutual information in collective decay
Xin H. H. Zhang, Daniel Malz, Peter Rabl
We study the collective decay of an initially inverted ensemble of two-level emitters in two distinct scenarios: when coupled to a squeezed photonic reservoir and when interacting…
Universal time-dependent control scheme for realizing arbitrary linear bosonic transformations
Ze-Liang Xiang, Diego González Olivares, Juan José GarcÃa-Ripoll +1
We study the implementation of arbitrary excitation-conserving linear transformations between two sets of stationary bosonic modes, which are connected through a photonic quant…
Thermodynamics of ultrastrongly coupled light-matter systems
Philipp Pilar, Daniele De Bernardis, Peter Rabl
We study the thermodynamic properties of a system of two-level dipoles that are coupled ultrastrongly to a single cavity mode. By using exact numerical and approximate analytical m…
Contextuality in phase space
Ali Asadian, Costantino Budroni, Frank E. S. Steinhoff +2
We present a general framework for contextuality tests in phase space using displacement operators. First, we derive a general condition that a single-mode displacement operator sh…
Hybrid quantum devices and quantum engineering
Margareta Wallquist, Klemens Hammerer, Peter Rabl +2
We discuss prospects of building hybrid quantum devices involving elements of atomic and molecular physics, quantum optics and solid state elements with the attempt to combine adva…
Non-classicality tests and entanglement witnesses for macroscopic mechanical superposition states
Oleg Gittsovich, Tobias Moroder, Ali Asadian +2
We describe a set of measurement protocols for performing non-classicality tests and the verification of entangled superposition states of macroscopic continuous variable systems,…
Mapping of a many-qubit state onto an oscillator using controlled displacements
Anders J. E. Bjerrum, Ulrik L. Andersen, Peter Rabl
We extend the controlled displacement interaction between a qubit and a harmonic oscillator to the multi-qubit (qudit) case. We define discrete quadratures of the qudit and show ho…
Refrigeration of a 1D gas of microwave photons
Lukas SchamriÃ, Lukas Schamriß, Louis Garbe +1
We discuss a conceptually simple scheme for cooling a one dimensional gas of microwave photons in a superconducting transmission line. By shunting one end of the transmission line…
Hybrid Mechanical Systems
Philipp Treutlein, Claudiu Genes, Klemens Hammerer +2
We discuss hybrid systems in which a mechanical oscillator is coupled to another (microscopic) quantum system, such as trapped atoms or ions, solid-state spin qubits, or supercondu…
Chiral quantum optics in the bulk of photonic quantum Hall systems
Daniele De Bernardis, Francesco Piccioli, Peter Rabl +1
We study light-matter interactions in the bulk of a two-dimensional photonic lattice system, where photons are subject to the combined effect of a synthetic magnetic field and an o…
Hybrid quantum device based on NV centers in diamond nanomechanical resonators plus superconducting waveguide cavities
Peng-Bo Li, Yong-Chun Liu, S. -Y. Gao +4
We propose and analyze a hybrid device by integrating a microscale diamond beam with a single built-in nitrogen-vacancy (NV) center spin to a superconducting coplanar waveguide (CP…
Ultrastrong coupling phenomena beyond the Dicke model
Tuomas Jaako, Ze-Liang Xiang, Juan José Garcia-Ripoll +1
We study effective light-matter interactions in a circuit QED system consisting of a single resonator, which is coupled symmetrically to multiple superconducting qubits. Start…
Atom-field dressed states in slow-light waveguide QED
Giuseppe Calajo, Francesco Ciccarello, Darrick Chang +1
We discuss the properties of atom-photon bound states in waveguide QED systems consisting of single or multiple atoms coupled strongly to a finite-bandwidth photonic channel. Such…
Universal deterministic quantum operations in microwave quantum links
Guillermo F. Peñas, Ricardo Puebla, Tomás Ramos +2
We propose a realistic setup, inspired by already existing experiments, within which we develop a general formalism for the implementation of distributed quantum gates. Mediated by…
Quantum Simulation of Non-perturbative Cavity QED with Trapped Ions
Tuomas Jaako, Juan José Garcia-Ripoll, Peter Rabl
We discuss the simulation of non-perturbative cavity-QED effects using systems of trapped ions. Specifically, we address the implementation of extended Dicke models with both colle…
Dissipative Phase Transition in the Open Quantum Rabi Model
Myung-Joong Hwang, Peter Rabl, Martin B. Plenio
We demonstrate that the open quantum Rabi model (QRM) exhibits a second-order dissipative phase transition (DPT) and propose a method to observe this transition with trapped ions.…
Quantum limited velocity readout and quantum feedback cooling of a trapped ion via electromagnetically induced transparency
Peter Rabl, Viktor Steixner, Peter Zoller
We discuss continuous observation of the momentum of a single atom by employing the high velocity sensitivity of the index of refraction in a driven -system based on electromag…
Optomechanically induced non-reciprocity in microring resonators
Mohammad Hafezi, Peter Rabl
We describe a new approach for on-chip optical non-reciprocity which makes use of strong optomechanical interaction in microring resonators. By optically pumping the ring resonator…
Electric-Field Noise above a Thin Dielectric Layer on Metal Electrodes
Muir Kumph, Carsten Henkel, Peter Rabl +2
The electric-field noise above a layered structure composed of a planar metal electrode covered by a thin dielectric is evaluated and it is found that the dielectric film considera…
Quantum state transfer via acoustic edge states in a 2D optomechanical array
Marc-Antoine Lemonde, Vittorio Peano, Peter Rabl +1
We propose a novel hybrid platform where solid-state spin qubits are coupled to the acoustic modes of a two-dimensional array of optomechanical nano cavities. Previous studies of c…
Nonreciprocity in Quantum Technology
Shabir Barzanjeh, André Xuereb, Andrea Alù +4
Nonreciprocity-the ability to transmit signals in one direction while blocking them in the reverse-has become a powerful resource in quantum technologies, enabling directional ampl…
Cavity quantum electrodynamics in the non-perturbative regime
Daniele De Bernardis, Tuomas Jaako, Peter Rabl
We study a generic cavity-QED system where a set of (artificial) two-level dipoles is coupled to the electric field of a single-mode LC resonator. This setup is used to derive a mi…
Quantum optical impurity models in interacting waveguide QED
Adrian Paul Misselwitz, Jacquelin Luneau, Peter Rabl
We consider a generic model for interacting waveguide QED systems, where photons in a coupled-cavity array localize around atomic impurities while simultaneously interacting throug…
Harvesting Multiqubit Entanglement from Ultrastrong Interactions in Circuit Quantum Electrodynamics
Federico Armata, Giuseppe Calajo, Tuomas Jaako +2
We analyze a multiqubit circuit QED system in the regime where the qubit-photon coupling dominates over the system's bare energy scales. Under such conditions a manifold of low-ene…
Autonomous Distribution of Programmable Multiqubit Entanglement in a Dual-Rail Quantum Network
Joan AgustÃ, Xin H. H. Zhang, Yuri Minoguchi +1
We propose and analyze a scalable and fully autonomous scheme for preparing spatially distributed multiqubit entangled states in a dual-rail waveguide QED setup. In this approach,…
Phase-Space Methods for Simulating the Dissipative Many-Body Dynamics of Collective Spin Systems
Julian Huber, Peter Kirton, Peter Rabl
We describe an efficient numerical method for simulating the dynamics and steady states of collective spin systems in the presence of dephasing and decay. The method is based on th…
All-mechanical coherence protection and fast control of a spin qubit
Eliza Cornell, Zhujing Xu, Zhaoyou Wang +9
In a phononic quantum network, quantum information is stored and processed within stationary nodes defined by solid-state spins, and the information is routed between nodes by phon…
Active energy transport and the role of symmetry breaking in microscopic power grid
Julian Huber, Peter Rabl
We study the transfer of energy through a network of coupled oscillators, which represents a minimalmicroscopic power grid connecting multiple active quantum machines. We evaluate…
General description of quasi-adiabatic dynamical phenomena near exceptional points
Thomas J. Milburn, Jörg Doppler, Catherine A. Holmes +3
The appearance of so-called exceptional points in the complex spectra of non-Hermitian systems is often associated with phenomena that contradict our physical intuition. One exampl…
Feedback cooling of a single trapped ion
Pavel Bushev, Daniel Rotter, Alex Wilson +7
Based on a real-time measurement of the motion of a single ion in a Paul trap, we demonstrate its electro-mechanical cooling below the Doppler limit by homodyne feedback control (c…
Strong coupling between moving atoms and slow-light Cherenkov photons
Giuseppe Calajo, Peter Rabl
We describe the coupling of moving atoms to a one dimensional photonic waveguide in the regime where the atomic velocities are comparable to the effective speed of light. Such cond…
PT-symmetry breaking in the steady state of microscopic gain-loss systems
Kosmas V. Kepesidis, Thomas J. Milburn, Julian Huber +3
The phenomenon of PT (parity- and time-reversal) symmetry breaking is conventionally associated with a change in the complex mode spectrum of a non-Hermitian system that marks a tr…
Non-Markovian thermal reservoirs for autonomous entanglement distribution
Joan AgustÃ, Christian M. F. Schneider, Kirill G. Fedorov +2
We describe a novel scheme for the generation of stationary entanglement between two separated qubits that are driven by a purely thermal photon source. While in this scenario the…
The bosonic skin effect: boundary condensation in asymmetric transport
Louis Garbe, Yuri Minoguchi, Julian Huber +1
We study the incoherent transport of bosonic particles through a one dimensional lattice with different left and right hopping rates, as modelled by the asymmetric simple inclusion…
Electrostatics-induced breakdown of the integer quantum Hall effect in cavity QED
Gian Marcello Andolina, Zeno Bacciconi, Alberto Nardin +4
We address the prevailing theoretical explanation of the recently observed breakdown of the integer quantum Hall effect in a two-dimensional electron gas embedded in a metallic spl…
Super-correlated radiance in nonlinear photonic waveguides
Zhihai Wang, Tuomas Jaako, Peter Kirton +1
We study the collective decay of two-level emitters coupled to a nonlinear waveguide, for example, a nanophotonic lattice or a superconducting resonator array with strong photon-ph…
Quantum computing with superconducting circuits in the picosecond regime
Daoquan Zhu, Tuomas Jaako, Qiongyi He +1
We discuss the realization of a universal set of ultrafast single- and two-qubit operations with superconducting quantum circuits and investigate the most relevant physical and tec…
Excitable quantum systems: the bosonic avalanche laser
Louis Garbe, Peter Rabl
We investigate the dynamics of a lasing system driven by a current of bosonic (quasi-)particles via a dissipative three-mode mixing process. A semi-classical analysis of this syste…
Intracity quantum communication via thermal microwave networks
Ze-Liang Xiang, Mengzhen Zhang, Liang Jiang +1
Communication over proven-secure quantum channels is potentially one of the most wide-ranging applications of currently developed quantum technologies. It is generally envisioned t…