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

C. Y. Hu, W. J. Munro, J. L. O'Brien, J. G. Rarity

Research output: Contribution to journalArticle

163 Citations (Scopus)

Abstract

We propose an entanglement beam splitter (EBS) using a quantum-dot spin in a double-sided optical microcavity. In contrast to the conventional optical beam splitter, the EBS can directly split a photon-spin product state into two constituent entangled states via transmission and reflection with high fidelity and high efficiency (up to 100 percent). This device is based on giant optical circular birefringence induced by a single spin as a result of cavity quantum electrodynamics and the spin-selection rule of trion transition (Pauli blocking). The EBS is robust and it is immune to the fine-structure splitting in a realistic quantum dot. This quantum device can be used for deterministically creating photon-spin, photon-photon, and spin-spin entanglements as well as a single-shot quantum nondemolition measurement of a single spin. Therefore, the EBS can find wide applications in quantum information science and technology.

Original languageEnglish
Article number205326
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number20
DOIs
Publication statusPublished - 30 Nov 2009
Externally publishedYes

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