The Experts below are selected from a list of 18144 Experts worldwide ranked by ideXlab platform
Aashish A Clerk - One of the best experts on this subject based on the ideXlab platform.
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Reservoir Engineering with localized dissipation dynamics and prethermalization
Physical Review Research, 2020Co-Authors: Yariv Yanay, Aashish A ClerkAbstract:This paper analyzes the dynamics of a large quantum lattice of non-interacting bosons when it is locally coupled to a Reservoir of squeezed light. The authors find that the medium term evolution of the lattice shows ballistic behavior, with a quasi-stationary state on the inside of an expanding light-cone. In the long term, the system's approach to a final steady state is dictated by a dissipative spectrum that shows complex, non-monotonous dependence on the strength of the coupling to the Reservoir.
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Reservoir Engineering with localized dissipation dynamics and pre thermalization
arXiv: Quantum Physics, 2020Co-Authors: Yariv Yanay, Aashish A ClerkAbstract:Reservoir Engineering lattice states using only localized engineered dissipation is extremely attractive from a resource point of view, but can suffer from long relaxation times. Here, we study the relaxation dynamics of bosonic lattice systems locally coupled to a single squeezed Reservoir. Such systems can relax into a highly non-trivial pure states with long-range entanglement. In the limit of large system size, analytic expressions for the dissipation spectrum can be found by making an analogy to scattering from a localized impurity. This allows us to study the cross-over from perturbative relaxation to a slow, quantum-Zeno regime. We also find the possibility of regimes of accelerated relaxation due to a surprising impedance matching phenomena. We also study intermediate time behaviors, identifying a long-lived "prethermalized" state associated that exists within a light cone like area. This intermediate state can be quasi-stationary, and can very different entanglement properties from the ultimate dissipative steady state.
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Reservoir Engineering of bosonic lattices using chiral symmetry and localized dissipation
Physical Review A, 2018Co-Authors: Yariv Yanay, Aashish A ClerkAbstract:We show how a generalized kind of chiral symmetry can be used to construct highly efficient Reservoir Engineering protocols for bosonic lattices. These protocols exploit only a single squeezed Reservoir coupled to a single lattice site; this is enough to stabilize the entire system in a pure, entangled steady state. Our approach is applicable to lattices in any dimension and does not rely on translational invariance. We show how the relevant symmetry operation directly determines the real-space correlation structure in the steady state and give several examples that are within reach in several one- and two-dimensional quantum photonic platforms.
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nonreciprocal photon transmission and amplification via Reservoir Engineering
Physical Review X, 2015Co-Authors: A Metelmann, Aashish A ClerkAbstract:Nonreciprocal photonic systems allow for the unidirectional transmission and amplification of photons, which enables a host of applications. A new and general approach for realizing nonreciprocal interactions shows how they can be used to construct quantum-limited amplifiers and isolators.
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nonreciprocal photon transmission and amplification via Reservoir Engineering
arXiv: Quantum Physics, 2015Co-Authors: A Metelmann, Aashish A ClerkAbstract:We discuss a general method for constructing nonreciprocal, cavity-based photonic devices, based on matching a given coherent interaction with its corresponding dissipative counterpart; our method generalizes the basic structure used in the theory of cascaded quantum systems, and can render an extremely wide class of interactions directional. In contrast to standard interference-based schemes, our approach allows directional behavior over a wide bandwidth. We show how it can be used to devise isolators and directional, quantum-limited amplifiers. We discuss in detail how this general method allows the construction of a directional, noise-free phase-sensitive amplifier that is not limited by any fundamental gain-bandwidth constraint. Our approach is particularly well-suited to implementations using superconducting microwave circuits and optomechanical systems.
Mazyar Mirrahimi - One of the best experts on this subject based on the ideXlab platform.
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Remote entanglement stabilization and concentration by quantum Reservoir Engineering
Physical Review A, 2018Co-Authors: Nicolas Didier, Jérémie Guillaud, Shyam Shankar, Mazyar MirrahimiAbstract:Quantum information processing in a modular architecture requires the distribution, stabilization, and distillation of entanglement in a qubit network. We present autonomous entanglement stabilization protocols between two superconducting qubits that are coupled to distant cavities. The coupling between cavities is mediated and controlled via a three-wave mixing device that generates either a two-mode squeezed state or a delocalized mode between the remote cavities depending on the pump applied to the mixer. Local drives on the qubits and the cavities steer and maintain the system to the desired qubit Bell state. Most spectacularly, even a weakly squeezed state can stabilize a maximally entangled Bell state of two distant qubits through an autonomous entanglement concentration process. Moreover, we show that such Reservoir-Engineering-based protocols can stabilize entanglement in the presence of qubit-cavity asymmetries and losses.
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Single-Photon-Resolved Cross-Kerr Interaction for Autonomous Stabilization of Photon-Number States
Physical Review Letters, 2015Co-Authors: Eric Holland, Zaki Leghtas, Brian Vlastakis, Reinier Heeres, Matthew Reagor, Uri Vool, Luigi Frunzio, Gerhard Kirchmair, Michel H. Devoret, Mazyar MirrahimiAbstract:Quantum states can be stabilized in the presence of intrinsic and environmental losses by either applying an active feedback condition on an ancillary system or through Reservoir Engineering. Reservoir Engineering maintains a desired quantum state through a combination of drives and designed entropy evacuation. We propose and implement a quantum-Reservoir Engineering protocol that stabilizes Fock states in a microwave cavity. This protocol is realized with a circuit quantum electrodynamics platform where a Josephson junction provides direct, nonlinear coupling between two superconducting waveguide cavities. The nonlinear coupling results in a single-photon-resolved cross-Kerr effect between the two cavities enabling a photon-number-dependent coupling to a lossy environment. The quantum state of the microwave cavity is discussed in terms of a net polarization and is analyzed by a measurement of its steady state Wigner function.
Sabrina Maniscalco - One of the best experts on this subject based on the ideXlab platform.
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Reservoir Engineering using quantum optimal control for qubit reset
New Journal of Physics, 2019Co-Authors: Daniel Basilewitsch, Sabrina Maniscalco, Francesco Cosco, Nicola Lo Gullo, Mikko Mottonen, Tapio Alanissila, Christiane P KochAbstract:We determine how to optimally reset a superconducting qubit which interacts with a thermal environment in such a way that the coupling strength is tunable. Describing the system in terms of a time-local master equation with time-dependent decay rates and using quantum optimal control theory, we identify temporal shapes of tunable level splittings which maximize the efficiency of the reset protocol in terms of duration and error. Time-dependent level splittings imply a modification of the system-environment coupling, varying the decay rates as well as the Lindblad operators. Our approach thus demonstrates efficient Reservoir Engineering employing quantum optimal control. We find the optimized reset strategy to consist in maximizing the decay rate from one state and driving non-adiabatic population transfer into this strongly decaying state.
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entanglement control via Reservoir Engineering in ultracold atomic gases
EPL, 2013Co-Authors: Suzanne Mcendoo, Pinja Haikka, G De Chiara, G M Palma, Sabrina ManiscalcoAbstract:We study the entanglement of two impurity qubits immersed in a Bose-Einstein condensate (BEC) Reservoir. This open quantum system model allows for interpolation between a common dephasing scenario and an independent dephasing scenario by modifying the wavelength of the superlattice superposed to the BEC, and how this influences the dynamical properties of the impurities. We demonstrate the existence of rich dynamics corresponding to different values of Reservoir parameters, including phenomena such as entanglement trapping, revivals of entanglement, and entanglement generation. In the spirit of Reservoir Engineering, we present the optimal BEC parameters for entanglement generation and trapping, showing the key role of the ultracold-gas interactions.
Rosario Fazio - One of the best experts on this subject based on the ideXlab platform.
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persistent currents by Reservoir Engineering
Physical Review A, 2018Co-Authors: Maximilian Keck, Davide Rossini, Rosario FazioAbstract:We demonstrate that persistent currents can be induced in a quantum system in contact with a structured Reservoir, without the need of any applied gauge field. The working principle of the mechanism leading to their presence is based on the extension to the many-body scenario of nonreciprocal Lindblad dynamics, recently put forward by Metelmann and Clerk, Phys. Rev. X 5, 021025 (2015): Nonreciprocity can be generated by suitably balancing coherent interactions with their corresponding dissipative version, induced by the coupling to a common structured environment, so as to make the total interactions directional. Specifically, we consider an interacting spin- (or boson-) model in a ring-shaped one-dimensional lattice coupled to an external bath. By employing a combination of cluster mean-field, exact diagonalization, and matrix-product-operator techniques, we show that solely dissipative effects suffice to engineer steady states with a persistent current that survives in the limit of large systems. We also verify the robustness of such current in the presence of additional dissipative or Hamiltonian perturbation terms.
J Casanova - One of the best experts on this subject based on the ideXlab platform.
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quantum simulation of dissipative processes without Reservoir Engineering
Scientific Reports, 2015Co-Authors: R Di Candia, J S Pedernales, A Del Campo, E Solano, J CasanovaAbstract:We present a quantum algorithm to simulate general finite dimensional Lindblad master equations without the requirement of Engineering the system-environment interactions. The proposed method is able to simulate both Markovian and non-Markovian quantum dynamics. It consists in the quantum computation of the dissipative corrections to the unitary evolution of the system of interest, via the reconstruction of the response functions associated with the Lindblad operators. Our approach is equally applicable to dynamics generated by effectively non-Hermitian Hamiltonians. We confirm the quality of our method providing specific error bounds that quantify its accuracy.
