Slowing Quantum Decoherence by Squeezing in Phase Space

Jeannic, Hanna Le; Cavaillès, Adrien; Huang, Kun; Filip, Radim; Laurat, Julien

doi:10.1103/physrevlett.120.073603

Cited by 51 publications

(58 citation statements)

References 49 publications

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“…Another potential application of a fast, coherent squeezer is the preservation of fragile quantum states, such as Schrödinger cats [46]. Cats formed by the superposition of coherent states exhibit strong Wigner negativity and are an important resource for continuous variable quantum communication [47].…”

Section: Application: Preservation Of Schrödinger Cat Statesmentioning

confidence: 99%

Rapid mechanical squeezing with pulsed optomechanics

Bennett

Bowen

2018

New J. Phys.

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Macroscopic mechanical oscillators can be prepared in quantum states and coherently manipulated using the optomechanical interaction. This has recently been used to prepare squeezed mechanical states. However, the scheme used in these experiments relies on slow, dissipative evolution that destroys the system's memory of its initial state. In this paper we propose a protocol based on a sequence of four pulsed optomechanical interactions. In addition to being coherent, our scheme executes in a time much shorter than a mechanical period. We analyse applications in impulsive force sensing and preservation of Schrödinger cat states, which are useful in continuous-variable quantum information protocols.

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Section: Application: Preservation Of Schrödinger Cat Statesmentioning

confidence: 99%

Rapid mechanical squeezing with pulsed optomechanics

Bennett

Bowen

2018

New J. Phys.

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“…where | ± iα is a coherent state with purely imaginary amplitude ±iα; N ± ≡ 2(1 ± e −2|α| 2 ). We note that appropriately squeezing a bosonic state can also improve the tolerance of encoded quantum information against channel loss [41,42]. Apart from choosing another encoding, the logical fidelity can also be improved by using noiseless subsystems (NS) [43][44][45].…”

Section: Methodsmentioning

confidence: 99%

“…[9] and a more general strategy in [40].) Furthermore, we show in Methods that by using squeezed versions of existing encodings of logical qubits [41,42], or by using noiseless subsystems [43][44][45][46][47], the effects of single-quadrature transduction noise can also be mitigated without conducting active error correction.…”

mentioning

confidence: 93%

High-fidelity bosonic quantum state transfer using imperfect transducers and interference

Lau

Clerk

2019

npj Quantum Inf

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We consider imperfect two-mode bosonic quantum transducers that cannot completely transfer an initial source-system quantum state due to insufficient coupling strength or other Hamiltonian non-idealities. We show that such transducers can generically be made perfect by using interference and phase-sensitive amplification. Our approach is based on the realization that a particular kind of imperfect transducer (one which implements a swapped quantum non-demolition (QND) gate) can be made into a perfect one-way transducer using feed-forward and/or injected squeezing. We show that a generic imperfect transducer can be reduced to this case by repeating the imperfect transduction operation twice, interspersed with amplification. Crucially, our scheme only requires the ability to implement squeezing operations and/or homodyne measurement on one of the two modes involved. It is thus ideally suited to schemes where there is an asymmetry in the ability to control the two coupled systems (e.g. microwave-to-optics quantum state transfer). We also discuss a correction protocol that requires no injected squeezing and/or feed-forward operation.

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“…Applying an initial control operation is equivalent to optimally encoding information before the action of a noisy channel, an idea that has been proposed to preserve the multipartite entanglement and the QFI of multiqubit systems [61,62] and recently tested experimentally [63]. In a continuous variables setting, one may, along similar lines, use squeezing to minimise the decoherence of non-Gaussian states evolving in a Gaussian environment, which is formally equivalent to squeezing the state of the environment [64][65][66][67].…”

Section: Introductionmentioning

confidence: 99%

Time-local optimal control for parameter estimation in the Gaussian regime

2020

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Information about a classical parameter encoded in a quantum state can only decrease if the state undergoes a non-unitary evolution, arising from the interaction with an environment. However, instantaneous control unitaries may be used to mitigate the decrease of information caused by an open dynamics. A possible, locally optimal (in time) choice for such controls is the one that maximises the time-derivative of the quantum Fisher information (QFI) associated with a parameter encoded in an initial state. In this study, we focus on a single bosonic mode subject to a Markovian, thermal master equation, and determine analytically the optimal time-local control of the QFI for its initial squeezing angle (optical phase) and strength. We show that a single initial control operation is already optimal for such cases and quantitatively investigate situations where the optimal control is applied after the open dynamical evolution has begun.

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Slowing Quantum Decoherence by Squeezing in Phase Space

Cited by 51 publications

References 49 publications

Rapid mechanical squeezing with pulsed optomechanics

Rapid mechanical squeezing with pulsed optomechanics

High-fidelity bosonic quantum state transfer using imperfect transducers and interference

Time-local optimal control for parameter estimation in the Gaussian regime

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