Optimal entanglement concentration for quantum dot and optical microcavities systems

Abstract

A recent paper [Chuan Wang, Phys. Rev. A \textbf{86}, 012323 (2012)] discussed an entanglement concentration protocol (ECP) for partially entangled electrons using a quantum dot and microcavity coupled system. In his paper, each two-electron spin system in a partially entangled state can be concentrated with the assistance of an ancillary quantum dot and a single photon. In this paper, we will present an optimal ECP for such entangled electrons with the help of only one single photon. Compared with the protocol of Wang, the most significant advantage is that during the whole ECP, the single photon only needs to pass through one microcavity which will increase the total success probability if the cavity is imperfect. The whole protocol can be repeated to get a higher success probability. With the feasible technology, this protocol may be useful in current long-distance quantum communications.

arXiv comment6 pages, 3 figures

References in corpus (20)

• Quantum secret sharing
• Concentrating Partial Entanglement by Local Operations
• A Two-Step Quantum Direct Communication Protocol Using Einstein-Podolsky-Rosen Pair Block
• Theoretical efficient high capacity Quantum Key Distribution Scheme
• Efficient Multi-Party Quantum Secret Sharing Schemes
• Dipole induced transparency in drop-filter cavity-waveguide systems
• Purification via entanglement swapping and conserved entanglement
• Giant optical Faraday rotation induced by a single electron spin in a quantum dot: Applications to entangling remote spins via a single photon
• CNOT and Bell-state analysis in the weak-coupling cavity QED regime
• Nonlocal entanglement concentration scheme for partially entangled multipartite systems with nonlinear optics
• Efficient single-photon-assisted entanglement concentration for partially entangled photon pairs
• A Concentration/Purification Scheme for Two Partially Entangled Photon Pairs
• A Practical Scheme for Entanglement Concentration
• Entangling photons using a charged quantum dot in a microcavity
• The entanglement beam splitter: a quantum-dot spin in a double-sided optical microcavity
• Efficient two-step entanglement concentration for arbitrary W states
• Charge detection enables free-electron quantum computation
• Optimal nonlocal multipartite entanglement concentration based on projection measurements
• Optimal entanglement purifying via entanglement swapping
• Loss-resistant state teleportation and entanglement swapping using a quantum-dot spin in an optical microcavity