Quantum state protection from finite-temperature thermal noise with application to controlled quantum teleportation

doi:10.1088/1674-1056/acbd2a

Abstract We propose a quantum state protection scheme via quantum feedforward control combined with environment-assisted measurement to protect arbitrary unknown initial states from the finite-temperature thermal noise (FTTN). The main strategy is to transfer the quantum system to a noise-robust state by weak measurement and feedforward control before the noise channel. Then we apply the environment-assisted measurement on the noise channel to select our desired damped states that are invertible to the initial state. After the noise channel, the reversal operations are applied to restore the initial state. We consider the protection of a single-qubit system, derive the analytical expressions of the success probability and the fidelity, and analyze the influence of key parameters on the performance of the proposed scheme. Unlike previous studies, there is no trade-off between the fidelity and the success probability in the proposed scheme; hence one could maximize them separately. Simulation results show that the proposed scheme can greatly improve the fidelity of the quantum state with a certain success probability. Moreover, the proposed scheme is successfully applied to improving the fidelity of controlled quantum teleportation through two independent FTTN channels from the perspective of protecting the shared entanglement.

Keywords: quantum feedforward control environment-assisted measurement weak measurement quantum teleportation

Received: 11 November 2022
Revised: 07 February 2023
Accepted manuscript online: 20 February 2023

PACS:	03.67.Pp	(Quantum error correction and other methods for protection against decoherence)
	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	03.65.Ud	(Entanglement and quantum nonlocality)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61973290), and a Program from Ministry of Science and Technology of China (Grant No. QN2022200007L).

Corresponding Authors: Sajede Harraz
E-mail: sajede@ustc.edu.cn

Cite this article:

Chi Wang(王驰), Sajede Harraz, Jiao-Yang Zhang(张骄阳), and Shuang Cong(丛爽) Quantum state protection from finite-temperature thermal noise with application to controlled quantum teleportation 2023 Chin. Phys. B 32 050306

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Quantum state protection from finite-temperature thermal noise with application to controlled quantum teleportation

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