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Quantum Electronics and Laser Science Conference

Two-photon interference in an EIT system

Jianming Wen, Morton H. Rubin

Published Dec 10, 2005• 0 citations
Publisher

Abstract

The possibility of storing and retrieving a single photon of SPDC entangled photon pairs is examined by using electromagnetically induced transparency (EIT). The theory of a proof of principle two-photon interferometer demonstrates new features.
DOI
10.1109/qels.2005.1548850

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Quantum memories, for storing then retrieving photonic quantum states on demand, are crucial components for scalable quantum technologies. Spontaneous parametric downconversion (SPDC) with a nonlinear crystal is the most widely used process for generating entangled photon pairs or heralded single photons. Despite the desirability of efficient quantum memories for SPDC-generated single photons, the storage and retrieval efficiencies achieved with this approach still fall below 50%, a threshold value for practical applications. Here, we report an efficiency of > 70% for the storage of heralded single photons generated by cavity-enhanced SPDC using atomic quantum memories based on electromagnetically induced transparency (EIT). In addition, we demonstrate the quantum memory for single-photon polarization qubits with a fidelity of ∼96%. This result paves the way towards the development of large-scale quantum networks.