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Quantum Orbital-State Control of a Neutral Nitrogen-Vacancy Center at Millikelvin Temperatures
Hodaka Kurokawa1, Shintaro Nakazato2, Toshiharu Makino1,3
1Yokohama National University, Quantum Information Research Center, Institute of Advanced Sciences, 79-5 Tokiwadai, Hodogaya, Yokohama, 240-8501, Japan.
None:
A neutral nitrogen-vacancy center (NV^{0}) is promising for realizing strong coupling with a single microwave photon due to its large electric field sensitivity, although it is susceptible to environmental phonon noise at 5 K. Decreasing the temperature to 15 mK results in a tenfold increase in orbital relaxation time compared to that at 5 K. Dynamical decoupling pulses significantly increase the orbital coherence time to more than 1.6 μs, representing a 30-fold improvement compared to that without decoupling pulses. Based on these results, a single NV^{0} can reach the strong coupling regime when coupled with a high-impedance microwave resonator, thus opening up the possibility of microwave quantum electrodynamics using a single optically active defect center in diamond.
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