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Annalen der Physik

Cover Picture: Entanglement Purification of Nonlocal Quantum‐Dot‐Confined Electrons Assisted by Double‐Sided Optical Microcavities (Ann. Phys. 4/2018)

Zichao Liu, Jian‐Song Hong, Jiajie Guo, Tao Li, Qing Ai, Ahmed Alsaedi, Tasawar Hayat, Fu‐Guo Deng

Published Apr 1, 2018• 0 citations
Publisher

Abstract

Quantum Computing The parity-check detector (PCD) is an attractive building block for distributed quantum computation and quantum communication. The PCD for electrons proposed in article number 1800029 by Tao Li, Fu-Guo Deng and co-workers is constructed in a parallel structure assisted by a polarization-entangled photon pair, which significantly improves the distance between two electrons for detection. Using the PCD, the parties in quantum communication can increase the entanglement purification efficiency and simultaneously decrease the quantum sources consumed for some particular fidelity thresholds with suitable arrangements.

DOI
10.1002/andp.201870018

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Quantum Computing The parity-check detector (PCD) is an attractive building block for distributed quantum computation and quantum communication. The PCD for electrons proposed in article number 1800029 by Tao Li, Fu-Guo Deng and co-workers is constructed in a parallel structure assisted by a polarization-entangled photon pair, which significantly improves the distance between two electrons for detection. Using the PCD, the parties in quantum communication can increase the entanglement purification efficiency and simultaneously decrease the quantum sources consumed for some particular fidelity thresholds with suitable arrangements.
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It has been found that logic-qubit entanglement has great potential for applications in quantum communication and quantum networks in recent years. However, along with the effects of noise and decoherence, the fidelity of the communication transmission can be greatly reduced. In this paper, we investigate the entanglement purification of logic bit-flip error and phase-flip error in polarization logic-qubit entanglement based on the parity-check measurement (PCM) gate, which is constructed by the cross-Kerr nonlinearity and used to distinguish the parity information of two-photon polarization states. The probability of entanglement purification is higher than the scheme using the linear optical method. Moreover, the quality of logic-qubit entangled states can be improved by a cyclic purification process. This entanglement purification protocol will be useful in the future when faced with long-distance communication with logic-qubit entanglement states.
Solid quantum repeater is a core part in a large-scale quantum network. Entanglement purification, the key technique in a quantum repeater, is used to distill high-quality nonlocal entanglement from an ensemble in a mixed entangled state and to depress the vicious influence on quantum information carriers caused by noise. Here, we present an imperfect-interaction-free entanglement purification on nonlocal electron spins in quantum dots for solid quantum repeaters, using faithful parity check on electron spins. The faithful parity check can make correct judgement on the parity mode without destructing the nonlocal solid entanglement even with the imperfect interaction between a QD embedded inside a microcavity and a circularly polarized photon in the nearly realistic condition. Therefore, the imperfect-interaction-free entanglement purification can prevent the maximally entangled states from being changed into partially entangled ones and guarantee the fidelity of the nonlocal mixed state to a desired one after purification. As this scheme is feasible in the nearly realistic condition with imperfect interaction, the requirements for experimental implementation will be relaxed. These distinctive features make this imperfect-interaction-free entanglement purification have more practical applications in solid quantum repeaters for a large-scale quantum network.