Kavli Affiliate: Ronald Hanson
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| Summary:
An efficient interface between a spin qubit and single photons is a key
enabling system for quantum science and technology. We report on a coherently
controlled diamond nitrogen-vacancy center electron spin qubit that is
optically interfaced with an open microcavity. Through Purcell enhancement and
an asymmetric cavity design, we achieve efficient collection of resonant
photons, while on-chip microwave lines allow for spin qubit control at a 10 MHz
Rabi frequency. With the microcavity tuned to resonance with the
nitrogen-vacancy center’s optical transition, we use excited state lifetime
measurements to determine a Purcell factor of 7.3 $pm$ 1.6. Upon pulsed
resonant excitation, we find a coherent photon detection probability of 0.5 %
per pulse. Although this result is limited by the finite excitation
probability, it already presents an order of magnitude improvement over the
solid immersion lens devices used in previous quantum network demonstrations.
Furthermore, we use resonant optical pulses to initialize and read out the
electron spin. By combining the efficient interface with spin qubit control, we
generate two-qubit and three-qubit spin-photon states and measure heralded
Z-basis correlations between the photonic time-bin qubits and the spin qubit.
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