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Spin squeezing in an ensemble of nitrogen–vacancy centres in diamond

Weijie Wu, Emily J. Davis, Lillian B. Hughes +10 more

arXiv:2503.14585NatureOct 1, 202525 citations

Phonon induced two-mode squeezing of nitrogen-vacancy center ensembles

Qidong Xu, Wen Li Yang, Zhang‐qi Yin

We propose a potentially practical scheme for realization of two-mode squeezed state with respect to two distant nitrogen-vacancy center ensembles coupled to two interconnected mechanical modes of diamond nanoresonators. By making use of the tunable phonon-spin interaction and the engineered phonon-phonon tunneling, both the desired excitation transfer process and the optimal two-mode squeezing between spin ensembles can be realized. We investigate the dynamics of the total system under infulences from the mechanical decay using both analytical and numerical methods, where the realistic conditions that leads to optimized squeezing between spin ensembles are analyzed.We propose a potentially practical scheme for realization of two-mode squeezed state with respect to two distant nitrogen-vacancy center ensembles coupled to two interconnected mechanical modes of diamond nanoresonators. By making use of the tunable phonon-spin interaction and the engineered phonon-phonon tunneling, both the desired excitation transfer process and the optimal two-mode squeezing between spin ensembles can be realized. We investigate the dynamics of the total system under infulences from the mechanical decay using both analytical and numerical methods, where the realistic conditions that leads to optimized squeezing between spin ensembles are analyzed.

arXiv:1512.08605Dec 29, 20151 citation

Decoherence of nitrogen-vacancy center spins in diamond and its control

Sai-Wah Ho, Jian Liang Hu, Nan Zhao +1 more

Bulletin of the American Physical SocietyMar 16, 20100 citations

Quantifying selective alignment of ensemble nitrogen-vacancy centers in (111) diamond

Kosuke Tahara, Hayato Ozawa, Takayuki Iwasaki +2 more

Selective alignment of nitrogen-vacancy (NV) centers in diamond is an important technique towards its applications. Quantification of the alignment ratio is necessary to design the optimized diamond samples. However, this is not a straightforward problem for dense ensemble of the NV centers. We estimate the alignment ratio of ensemble NV centers along the [111] direction in (111) diamond by optically detected magnetic resonance measurements. Diamond films deposited by N2 doped chemical vapor deposition have NV center densities over 1 × 1015 cm−3 and alignment ratios over 75%. Although spin coherence time (T2) is limited to a few μs by electron spins of nitrogen impurities, the combination of the selective alignment and the high density can be a possible way to optimize NV-containing diamond samples for the sensing applications.Selective alignment of nitrogen-vacancy (NV) centers in diamond is an important technique towards its applications. Quantification of the alignment ratio is necessary to design the optimized diamond samples. However, this is not a straightforward problem for dense ensemble of the NV centers. We estimate the alignment ratio of ensemble NV centers along the [111] direction in (111) diamond by optically detected magnetic resonance measurements. Diamond films deposited by N2 doped chemical vapor deposition have NV center densities over 1 × 1015 cm−3 and alignment ratios over 75%. Although spin coherence time (T2) is limited to a few μs by electron spins of nitrogen impurities, the combination of the selective alignment and the high density can be a possible way to optimize NV-containing diamond samples for the sensing applications.

Applied Physics LettersNov 9, 201539 citations

Quantum Control of Nuclear Spins Coupled to Nitrogen-Vacancy Centers in Diamond

Sorawis Sangtawesin

Jan 1, 20161 citation

Charge-state control of ensemble of nitrogen vacancy centers by n–i–n diamond junctions

Maki Shimizu, Toshiharu Makino, Takayuki Iwasaki +5 more

We fabricated n-type–intrinsic–n-type (n–i–n) diamond junctions to stabilize negatively charged nitrogen vacancy (NV − ) centers. An ensemble of NV centers was generated in a high-purity intrinsic diamond in order to maintain the spin coherence time. The Fermi-energy of the i-layers was controlled by band bending at the two n–i junctions. We confirmed that the NV centers can be modulated toward NV − centers by decreasing the width of the i-layers between adjacent n-layers. The spin coherence time for the NV − centers was maintained even for narrow i-layers.We fabricated n-type–intrinsic–n-type (n–i–n) diamond junctions to stabilize negatively charged nitrogen vacancy (NV − ) centers. An ensemble of NV centers was generated in a high-purity intrinsic diamond in order to maintain the spin coherence time. The Fermi-energy of the i-layers was controlled by band bending at the two n–i junctions. We confirmed that the NV centers can be modulated toward NV − centers by decreasing the width of the i-layers between adjacent n-layers. The spin coherence time for the NV − centers was maintained even for narrow i-layers.

Applied Physics ExpressFeb 20, 201810 citations

Spin squeezing in an ensemble of nitrogen-vacancy centers in diamond

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