Entanglement purification and concentration of electron-spin entangled states using quantum-dot spins in optical microcavities

Journal Article · Thu Sep 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.032307· OSTI ID:22068652

Chuan, Wang ^[1]; Yong, Zhang; Guangsheng, Jin ^[1]

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1. School of Science, Beijing University of Posts and Telecommunications, Beijing 100876 (China)

We present an entanglement purification protocol and an entanglement concentration protocol for electron-spin entangled states, resorting to quantum-dot spin and optical-microcavity-coupled systems. The parity-check gates (PCGs) constructed by the cavity-spin-coupling system provide a different method for the entanglement purification of electron-spin entangled states. This protocol can efficiently purify an electron ensemble in a mixed entangled state. The PCGs can also concentrate electron-spin pairs in less-entangled pure states efficiently. The proposed methods are more flexible as only single-photon detection and single-electron detection are needed.

• OSTI ID: 22068652
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 84; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CAVITIES
COUPLING
ELECTRON DETECTION
ELECTRONS
PARITY
PHOTONS
PURE STATES
QUANTUM DOTS
QUANTUM ENTANGLEMENT
SPIN