Quantum-memory-assisted interferometry can in principle remove optical delay lines and photon transport to a beam combiner, with timing set by memory gating and phase set by local phase-reference stability.
Entanglement between a diamond spin qubit and a photonic time-bin qubit at telecom wavelength
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We report on the realization and verification of quantum entanglement between an NV electron spin qubit and a telecom-band photonic qubit. First we generate entanglement between the spin qubit and a 637 nm photonic time-bin qubit, followed by photonic quantum frequency conversion that transfers the entanglement to a 1588 nm photon. We characterize the resulting state by correlation measurements in different bases and find a lower bound to the Bell state fidelity of F = 0.77 +/- 0.03. This result presents an important step towards extending quantum networks via optical fiber infrastructure.
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Eliminating photon transport in long-baseline optical interferometry using quantum memories
Quantum-memory-assisted interferometry can in principle remove optical delay lines and photon transport to a beam combiner, with timing set by memory gating and phase set by local phase-reference stability.