Stabilization of multi-mode Schrodinger cat states via normal-mode dissipation engineering

• URL: http://arxiv.org/abs/2103.12457v2
• Date: Tue, 16 Nov 2021 14:43:47 GMT
• Title: Stabilization of multi-mode Schrodinger cat states via normal-mode dissipation engineering
• Authors: Petr Zapletal, Andreas Nunnenkamp, Matteo Brunelli
• Abstract summary: Non-Gaussian quantum states have been deterministically prepared and autonomously stabilized in single- and two-mode circuit quantum electrodynamics architectures. We upgrade dissipation engineering to collective (normal) modes of nonlinear resonator arrays and show how to stabilize multi-mode Schrodinger cat states.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Non-Gaussian quantum states have been deterministically prepared and autonomously stabilized in single- and two-mode circuit quantum electrodynamics architectures via engineered dissipation. However, it is currently unknown how to scale up this technique to multi-mode non-Gaussian systems. Here, we upgrade dissipation engineering to collective (normal) modes of nonlinear resonator arrays and show how to stabilize multi-mode Schrodinger cat states. These states are multi-photon and multi-mode quantum superpositions of coherent states in a single normal mode delocalized over an arbitrary number of cavities. We consider tailored dissipative coupling between resonators that are parametrically driven and feature an on-site nonlinearity, which is either a Kerr-type nonlinearity or an engineered two-photon loss. For both types of nonlinearity, we find the same exact closed-form solutions for the two-dimensional steady-state manifold spanned by superpositions of multi-mode Schrodinger cat states. We further show that, in the Zeno limit of strong dissipative coupling, the even parity multi-mode cat state can be deterministically prepared from the vacuum. Remarkably, engineered two-photon loss gives rise to a fast relaxation towards the steady state, protecting the state preparation against decoherence due to intrinsic single-photon losses and imperfections in tailored dissipative coupling, which sets in at longer times. The relaxation time is independent of system size making the state preparation scalable. Multi-mode cat states are naturally endowed with a noise bias that increases exponentially with system size and can thus be exploited for enhanced robust encoding of quantum information.

Related papers

• Dissipative preparation and stabilization of many-body quantum states in a superconducting qutrit array [55.41644538483948]
  We present and analyze a protocol for driven-dissipatively preparing and stabilizing a manifold of quantum manybody entangled states. We perform theoretical modeling of this platform via pulse-level simulations based on physical features of real devices. Our work shows the capacity of driven-dissipative superconducting cQED systems to host robust and self-corrected quantum manybody states.
  arXiv  Detail & Related papers  (2023-03-21T18:02:47Z)
• Unconditional Wigner-negative mechanical entanglement with linear-and-quadratic optomechanical interactions [62.997667081978825]
  We propose two schemes for generating Wigner-negative entangled states unconditionally in mechanical resonators. We show analytically that both schemes stabilize a Wigner-negative entangled state that combines the entanglement of a two-mode squeezed vacuum with a cubic nonlinearity. We then perform extensive numerical simulations to test the robustness of Wigner-negative entanglement attained by approximate CPE states stabilized in the presence of thermal decoherence.
  arXiv  Detail & Related papers  (2023-02-07T19:00:08Z)
• Spontaneous symmetry breaking in non-steady modes of open quantum many-body systems [0.0]
  We consider spontaneous symmetry breaking in non-steady modes of an open quantum many-body system. For a dissipative spin model, it is shown that the most coherent mode exhibits a transition from a disordered phase to a symmetry-broken ordered phase.
  arXiv  Detail & Related papers  (2022-12-19T09:45:44Z)
• Quantum emulation of the transient dynamics in the multistate Landau-Zener model [50.591267188664666]
  We study the transient dynamics in the multistate Landau-Zener model as a function of the Landau-Zener velocity. Our experiments pave the way for more complex simulations with qubits coupled to an engineered bosonic mode spectrum.
  arXiv  Detail & Related papers  (2022-11-26T15:04:11Z)
• Remotely preparing optical Schr\"odinger cat states via homodyne detection in nondegenerate triple-photon spontaneous downconversion [0.0]
  We consider the generation of nonclassical optical quantum superpositions and investigate nonlinear quantum steering effects in NTPSD. We find that large-size Schr"odinger cat states of one downconverted mode can be achieved when the other two modes are subjected to homodyne detection.
  arXiv  Detail & Related papers  (2022-09-06T08:35:48Z)
• A critical Schr\"odinger cat qubit [0.0]
  In cat qubits, an engineered dissipation scheme combining two-photon drive and loss has been used to stabilize this manifold. In Kerr cat qubits, where highly-performing gates can be engineered, two-photon drive and Kerr nonlinearity cooperate to confine the system. We show that large detunings and small, but non-negligible, two-photon loss rates are fundamental to achieve optimal performance.
  arXiv  Detail & Related papers  (2022-08-09T17:44:00Z)
• Generating and detecting entangled cat states in dissipatively coupled degenerate optical parametric oscillators [1.238954119278917]
  "Cat states" embody quantum coherence in an accessible way and can be harnessed for fundamental tests and quantum information tasks alike. We show that a dissipative coupling between degenerate optical parametric oscillators extends this to two-mode entangled cat states. We numerically explore the parameter regime for the successful generation of transient two-mode entangled cat states.
  arXiv  Detail & Related papers  (2021-03-30T05:46:44Z)
• Superposition of two-mode squeezed states for quantum information processing and quantum sensing [55.41644538483948]
  We investigate superpositions of two-mode squeezed states (TMSSs) TMSSs have potential applications to quantum information processing and quantum sensing.
  arXiv  Detail & Related papers  (2021-02-01T18:09:01Z)
• Bose-Einstein condensate soliton qubit states for metrological applications [58.720142291102135]
  We propose novel quantum metrology applications with two soliton qubit states. Phase space analysis, in terms of population imbalance - phase difference variables, is also performed to demonstrate macroscopic quantum self-trapping regimes.
  arXiv  Detail & Related papers  (2020-11-26T09:05:06Z)
• Atomic self-organization emerging from tunable quadrature coupling [5.624813092014403]
  We propose a novel scheme to couple two density-wave degrees of freedom of a BEC to two quadratures of the cavity field. We unravel a dynamically unstable state induced by the cavity dissipation. Our work enriches the quantum simulation toolbox in the cavity-quantum-electrodynamics system.
  arXiv  Detail & Related papers  (2020-04-07T13:25:44Z)
• Parallel dark soliton pair in a bistable 2D exciton-polariton superfluid [47.187609203210705]
  2D dark solitons are unstable and collapse into vortices due to snake instabilities. We demonstrate that a pair of dark solitons can be formed in the wake of an obstacle in a polariton flow resonantly supported by a homogeneous laser beam.
  arXiv  Detail & Related papers  (2020-03-25T13:52:22Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.