Proposed entanglement beam splitter using a quantum-dot spin in a double-sided optical microcavity

By C. Hu, William J. Munro, Jeremy Lloyd O'Brien, John G. Rarity. 2009

180 citations recorded by the source corpus.

Received 7 August 2009; revised manuscript received 1 October 2009; published 30 November 2009We propose an entanglement beam splitter EBS using a quantum-dot spin in a double-sided opticalmicrocavity. In contrast to the conventional optical beam splitter, the EBS can directly split a photon-spinproduct state into two constituent entangled states via transmission and reflection with high fidelity and highefficiency up to 100 percent . This device is based on giant optical circular birefringence induced by a singlespin as a result of cavity quantum electrodynamics and the spin-selection rule of trion transition Pauli block-ing . The EBS is robust and it is immune to the fine-structure splitting in a realistic quantum dot. This quantumdevice can be used for deterministically creating photon-spin, photon-photon, and spin-spin entanglements aswell as a single-shot quantum nondemolition measurement of a single spin. Therefore, the EBS can find wideapplications in quantum information science and technology.DOI: 10.1103/PhysRevB.80.205326 PACS number s : 78.67.Hc, 03.67.Mn, 42.50.Pq, 78.20.Ek

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/c32c9a769a93cdd05c03ed7f7dade605af76f097