Robust photon-spin entangling gate using a quantum-dot spin in a microcavity

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dc.creatorHu, C. Y.
dc.creatorMunro, W. J.
dc.creatorO'Brien, J. L.
dc.creatorRarity, J. G.
dc.date2009-01-26
dc.date.accessioned2026-07-07T12:34:31Z
dc.date.available2026-07-07T12:34:31Z
dc.descriptionSemiconductor quantum dots (known as artificial atoms) hold great promise for solid-state quantum networks and quantum computers. To realize a quantum network, it is crucial to achieve light-matter entanglement and coherent quantum-state transfer between light and matter. Here we present a robust photon-spin entangling gate with high fidelity and high efficiency (up to 50 percent) using a charged quantum dot in a double-sided microcavity. This gate is based on giant circular birefringence induced by a single electron spin, and functions as an optical circular polariser which allows only one circularly-polarized component of light to be transmitted depending on the electron spin states. We show this gate can be used for single-shot quantum non-demolition measurement of a single electron spin, and can work as an entanglement filter to make a photon-spin entangler, spin entangler and photon entangler as well as a photon-spin quantum interface. This work allows us to make all building blocks for solid-state quantum networks with single photons and quantum-dot spins.
dc.description8pages, 5 figures
dc.identifierhttps://arxiv.org/abs/0901.3964
dc.identifierhttp://arxiv.org/abs/0901.3964
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/217458
dc.subjectQuantum Physics
dc.titleRobust photon-spin entangling gate using a quantum-dot spin in a microcavity
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