Quantum State Preparation and Protection by Measurement-Based Feedback Control Against Decoherence

Yan, Yan; Zou, Jian; Wang, Lu; Xu, Bao-Ming; Wang, Chao-Quan; Shao, Bin

doi:10.1088/0253-6102/63/2/06

Cited by 9 publications

(3 citation statements)

References 41 publications

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“…In all the above approaches, Kraus operators are used to stand for noise and the feedback control is described by a control map. In [61,62], the QFBC is considered for an open quantum system where a master equation is derived in the Lindblad form describing the evolution of the open quantum system subjected to a QFBC. The initial states are known mixed states composed of two nonorthogonal states.…”

Section: Quantum Feedback Controlmentioning

confidence: 99%

Comparison of quantum state protection against decoherence via weak measurement, a survey

Harraz¹,

Cong²,

Nieto³

2021

Preprint

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One of the crucial tasks in quantum systems is to reduce the effects of decoherence due to the unavoidable interactions between a system and its environment. Many protection schemes have been proposed recently, among them the weak measurement quantum measurement reversal (WMQMR), weak measurementbased quantum feedback control (QFBC) and quantum feed-forward control (QFFC) are reviewed in this paper. By considering weak measurement, the aim is to find a balance between information gain and disturbance of the system caused by the measurement. We classify different types of measurement and give the definition of noise sources and their effects on the state of the system. Finally, we compare and analyze the performance of the discussed protection schemes for different noise sources by numerical simulations.

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Section: Quantum Feedback Controlmentioning

confidence: 99%

Comparison of quantum state protection against decoherence via weak measurement, a survey

Harraz¹,

Cong²,

Nieto³

2021

Preprint

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“…Measurement-based state preparation has been discussed and demonstrated for spin-squeezed states ( [34,35]). Only limited investigations have been carried out for more general state preparation protocols (for examples see [36,37]).…”

Section: Introductionmentioning

confidence: 99%

Generating GHZ states with squeezing and post-selection

Alexander,

Uys,

Bollinger

2019

Preprint

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Many quantum state preparation methods rely on a combination of dissipative quantum state initialization, followed by unitary evolution to a desired target state. Here we demonstrate the usefulness of quantum measurement as an additional tool for quantum state preparation. Starting from a pure separable multipartite state, a control sequence, which includes rotation, spin squeezing via one-axis twisting, quantum measurement and post-selection, generates a highly entangled multipartite state, which we refer to as Projected Squeezed states (or P S states). Through an optimization method, we then identify parameters required to maximize the overlap fidelity of the P S states with the maximally entangled Greenberger-Horne-Zeilinger states (or GHZ states). The method leads to an appreciable decrease in state preparation time of GHZ states when compared to preparation through unitary evolution with one-axis twisting only.

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“…[25] can not only bring the conception of CV quantum voting but also offer us more opportunities to study more efficient voting schemes. Considering the voting efficiency, we suggest anonymous communications [26] and two quantum anonymous voting protocols (QAVP) based on a quantum cryptosystem with multidimensional CV, in which CV-based GHZ-like states [27][28][29][30] are applied as information carriers. The GHZ-like states employed as voting states in this paper consist of momentum-squeezed and position-squeezed modes.…”

Section: Introductionmentioning

confidence: 99%

Anonymous voting for multi-dimensional CV quantum system

et al. 2016

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We investigate the design of anonymous voting protocols, CV-based binary-valued ballot and CV-based multi-valued ballot with continuous variables (CV) in a multi-dimensional quantum cryptosystem to ensure the security of voting procedure and data privacy. The quantum entangled states are employed in the continuous variable quantum system to carry the voting information and assist information transmission, which takes the advantage of the GHZ-like states in terms of improving the utilization of quantum states by decreasing the number of required quantum states. It provides a potential approach to achieve the efficient quantum anonymous voting with high transmission security, especially in large-scale votes.

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Quantum State Preparation and Protection by Measurement-Based Feedback Control Against Decoherence

Cited by 9 publications

References 41 publications

Comparison of quantum state protection against decoherence via weak measurement, a survey

Comparison of quantum state protection against decoherence via weak measurement, a survey

Generating GHZ states with squeezing and post-selection

Anonymous voting for multi-dimensional CV quantum system

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