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Bulletin of the American Physical Society

A qubit-photon controlled-NOT gate using a quantum dot strongly coupled to a cavity

Hyochul Kim, Ranojoy Bose, Thomas C. Shen, Glenn S. Solomon, Edo Waks A

Published Mar 18, 2013• 0 citations
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The realization of quantum-photonic networks is a key challenge for optical quantum technologies. To scale such networks to many nodes and long distances, an efficient interface between stationary and flying qubits is necessary. One of the front-runners towards this goal is a spin-photon interface realised with a single charged QD with a localized electron spin that is strongly coupled to a micropillar cavity [1] . Through the strong spin-photon coupling, the polarization state of the optical field is controlled by the QD spin, thus modulating the cavity’s transmission properties. Controlling the polarization state over a wide angle is particularly useful for realizing high-fidelity polarization states and conditional phase quantum gates (e.g. CNOT) for photon-based quantum computing.