Observation of a Dissipation-Induced Classical to Quantum Transition

Raftery, James J.; Sadri, Darius; Schmidt, Sebastian; Türeci, Hakan E.; Houck, Andrew

doi:10.1103/physrevx.4.031043

Cited by 173 publications

(269 citation statements)

References 57 publications

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“…Realizations of quantum nonlinear media as ultracold atoms in optical lattices [1], ion traps [2] or superconducting circuits [3,4] are interesting candidates for future quantum information processors. Apart from this challenging goal, they are also testbeds to explore new many-body states of matter both in the classical and quantum regime [5].…”

Section: Introductionmentioning

confidence: 99%

Stationary discrete solitons in a driven dissipative Bose-Hubbard chain

et al. 2015

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We demonstrate that stationary localized solutions (discrete solitons) exist in one-dimensional Bose-Hubbard lattices with gain and loss in a semiclassical regime. Stationary solutions, by definition, are robust and do not demand state preparation. Losses, unavoidable in experiments, are not a drawback, but a necessary ingredient for these modes to exist. The semiclassical calculations are complemented with their classical limit and dynamics based on a Gutzwiller ansatz. We argue that circuit quantum electrodynamic architectures are ideal platforms for realizing the physics developed here. Finally, within the input-output formalism, we explain how to experimentally access the different phases, including the solitons, of the chain.

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Section: Introductionmentioning

confidence: 99%

Stationary discrete solitons in a driven dissipative Bose-Hubbard chain

et al. 2015

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“…This means that topological defects -vortices -in this field are possible. 23 Proliferation of vortices would lead to an even faster, simple exponential decay of spatial correlations. The present analysis does not take the possible presence of vortices into account.…”

Section: Absence Of Algebraic Order In 2dmentioning

confidence: 99%

Keldysh field theory for driven open quantum systems

2016

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Recent experimental developments in diverse areas -ranging from cold atomic gases to light-driven semiconductors to microcavity arrays -move systems into the focus which are located on the interface of quantum optics, many-body physics and statistical mechanics. They share in common that coherent and driven-dissipative quantum dynamics occur on an equal footing, creating genuine non-equilibrium scenarios without immediate counterpart in equilibrium condensed matter physics. This concerns both their non-thermal stationary states, as well as their many-body time evolution. It is a challenge to theory to identify novel instances of universal emergent macroscopic phenomena, which are tied unambiguously and in an observable way to the microscopic drive conditions. In this review, we discuss some recent results in this direction. Moreover, we provide a systematic introduction to the open system Keldysh functional integral approach, which is the proper technical tool to accomplish a merger of quantum optics and many-body physics, and leverages the power of modern quantum field theory to driven open quantum systems. CONTENTS

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“…From an experimental standpoint, our protocol is motivated by the rapid development of quantum simulation and information technology in recent years, such as cavity quantum electrodynamics (QED) [15][16][17][18], circuit-QED [19][20][21][22][23][24][25][26][27][28], Rydberg atoms [29][30][31][32], and trapped ions [33]; it is within current technology to engineer an ancilla qubit coupled to a manybody system globally. The ancilla qubit can be either the cavity photon mode or the internal state of an atom.…”

Section: Introductionmentioning

confidence: 99%

Measurement of many-body chaos using a quantum clock

2016

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There has been recent progress in understanding chaotic features in many-body quantum systems. Motivated by the scrambling of information in black holes, it has been suggested that the time dependence of out-of-timeordered (OTO) correlation functions such as O 2 (t)O 1 (0)O 2 (t)O 1 (0) is a faithful measure of quantum chaos. Experimentally, these correlators are challenging to access since they apparently require access to both forward and backward time evolution with the system Hamiltonian. Here, we propose a protocol to measure such OTO correlators using an ancilla which controls the direction of time. Specifically, by coupling the state of ancilla to the system Hamiltonian of interest, we can emulate the forward and backward time propagation, where the ancilla plays the role of a 'quantum clock'. Within this scheme, the continuous evolution of the entire system (the system of interest and the ancilla) is governed by a time-independent Hamiltonian. Our protocol is immune to errors that could occur when the direction of time evolution is externally controlled by a classical switch.

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Observation of a Dissipation-Induced Classical to Quantum Transition

Cited by 173 publications

References 57 publications

Stationary discrete solitons in a driven dissipative Bose-Hubbard chain

Stationary discrete solitons in a driven dissipative Bose-Hubbard chain

Keldysh field theory for driven open quantum systems

Measurement of many-body chaos using a quantum clock

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