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Nonlinear quantum evolution of a dissipative superconducting qubit
Orion Lee, Qian Cao, Yogesh N. Joglekar +1
Unitary and dissipative models of quantum dynamics are linear maps on the space of states or density matrices. This linearity encodes the superposition principle, a key feature of…
Exploring the topology of a non-Hermitian superconducting qubit using shortcuts to adiabaticity
Serra Erdamar, Maryam Abbasi, Weijian Chen +3
Open quantum systems described by a non-Hermitian Hamiltonian exhibit rich dynamics due to the topology of their complex energy spectrum. By encircling an exceptional point degener…
Exploring the Accuracy of Interferometric Quantum Measurements under Conservation Laws
Nicolò Piccione, Maria Maffei, Andrew N. Jordan +2
A (target) quantum system is often measured through observations performed on a second (meter) system to which the target is coupled. In the presence of global conservation laws ho…
Experimental Realization of Discrete Time Quasi-Crystals
Guanghui He, Bingtian Ye, Ruotian Gong +5
Floquet (periodically driven) systems can give rise to unique non-equilibrium phases of matter without equilibrium analogs. The most prominent example is the realization of discret…
Engineering nonequilibrium steady states through Floquet Liouvillians
Weijian Chen, Maryam Abbasi, Serra Erdamar +3
We experimentally study the transient dynamics of a dissipative superconducting qubit under periodic drive towards its nonequilibrium steady states. The corresponding stroboscopic…
Agnostic Phase Estimation
Xingrui Song, Flavio Salvati, Chandrashekhar Gaikwad +3
The goal of quantum metrology is to improve measurements' sensitivities by harnessing quantum resources. Metrologists often aim to maximize the quantum Fisher information, which bo…
Optically-Trapped Nanodiamond-Relaxometry Detection of Nanomolar Paramagnetic Spins in Aqueous Environments
Shiva Iyer, Changyu Yao, Olivia Lazorik +10
Probing electrical and magnetic properties in aqueous environments remains a frontier challenge in nanoscale sensing. Our inability to do so with quantitative accuracy imposes seve…
Entanglement assisted probe of the non-Markovian to Markovian transition in open quantum system dynamics
Chandrashekhar Gaikwad, Daria Kowsari, Carson Brame +8
We utilize a superconducting qubit processor to experimentally probe non-Markovian dynamics of an entangled qubit pair. We prepare an entangled state between two qubits and monitor…
Quantum energetics of a non-commuting measurement
Xiayu Linpeng, Nicolò Piccione, Maria Maffei +5
When a measurement observable does not commute with a quantum system's Hamiltonian, the energy of the measured system is typically not conserved during the measurement. Instead, en…
Fundamental mechanisms of energy exchanges in autonomous measurements based on dispersive qubit-light interaction
Nicolò Piccione, Maria Maffei, Xiayu Linpeng +3
Measuring an observable which does not commute with the Hamiltonian of a quantum system usually modifies the mean energy of this system. In an autonomous measurement scheme, coupli…
On-demand driven dissipation for cavity reset and cooling
Vivek Maurya, Haimeng Zhang, Daria Kowsari +9
We present a superconducting circuit device that provides active, on-demand, tunable dissipation on a target mode of the electromagnetic field. Our device is based on a tunable "di…
Chiral Bell-state transfer via dissipative Liouvillian dynamics
Shishir Khandelwal, Weijian Chen, Kater W. Murch +1
Chiral state transfer along closed loops in the vicinity of an exceptional point is one of the many counter-intuitive observations in non-Hermitian physics. The application of this…
Constraining work fluctuations of non-Hermitian dynamics across the exceptional point of a superconducting qubit
Serra Erdamar, Maryam Abbasi, Byung Ha +4
Thermodynamics constrains changes to the energy of a system, both deliberate and random, via its first and second laws. When the system is not in equilibrium, fluctuation theorems…
Superconducting Non-Reciprocity Based on Time-Modulated Coupled-Resonator Systems
Yi Zhuang, Chandrashekhar Gaikwad, Daria Kowsari +2
We present a unified approach for designing a diverse range of superconducting non-reciprocal components, including circulators, isolators, and uni-directional amplifiers, based on…
Observing Parity Time Symmetry Breaking in a Josephson Parametric Amplifier
Chandrashekhar Gaikwad, Daria Kowsari, Weijian Chen +1
A coupled two-mode system with balanced gain and loss is a paradigmatic example of an open quantum system that can exhibit real spectra despite being described by a non-Hermitian H…
Dissipative preparation and stabilization of many-body quantum states in a superconducting qutrit array
Yunzhao Wang, Kyrylo Snizhko, Alessandro Romito +2
We present and analyze a protocol for driven-dissipatively preparing and stabilizing a manifold of quantum manybody entangled states with symmetry-protected topological order. Spec…
Quantum acoustic Fano interference of surface phonons
J. M. Kitzman, J. R. Lane, C. Undershute +4
Quantum acoustic systems, which integrate surface or bulk phonons with superconducting qubits, offer a unique opportunity to investigate phononic and pr…
Quasi-Floquet prethermalization in a disordered dipolar spin ensemble in diamond
Guanghui He, Bingtian Ye, Ruotian Gong +4
Floquet (periodic) driving has recently emerged as a powerful technique for engineering quantum systems and realizing non-equilibrium phases of matter. A central challenge to stabi…
Parity-time symmetric holographic principle
Xingrui Song, Kater Murch
Originating from the Hamiltonian of a single qubit system, the phenomenon of the avoided level crossing is ubiquitous in multiple branches of physics, including the Landau-Zener tr…
Speeding up entanglement generation by proximity to higher-order exceptional points
Zeng-Zhao Li, Weijian Chen, Maryam Abbasi +2
Entanglement is a key resource for quantum information technologies ranging from quantum sensing to quantum computing. Conventionally, the entanglement between two coupled qubits i…
Phononic bath engineering of a superconducting qubit
J. M. Kitzman, J. R. Lane, C. Undershute +5
Phonons, the ubiquitous quanta of vibrational energy, play a vital role in the performance of quantum technologies. Conversely, unintended coupling to phonons degrades qubit perfor…
Many-body quantum vacuum fluctuation engines
Étienne Jussiau, Léa Bresque, Alexia Auffèves +2
We propose a many-body quantum engine powered by the energy difference between the entangled ground state of the interacting system and local separable states. Performing local ene…
Energetic cost of measurements using quantum, coherent, and thermal light
Xiayu Linpeng, Léa Bresque, Maria Maffei +3
Quantum measurements are basic operations that play a critical role in the study and application of quantum information. We study how the use of quantum, coherent, and classical th…
Engineered Dissipation for Quantum Information Science
Patrick M. Harrington, Erich Mueller, Kater Murch
Quantum information processing relies on precise control of non-classical states in the presence of many uncontrolled environmental degrees of freedom -- requiring careful orchestr…