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Single‐Qubit Operations with the Nitrogen‐Vacancy Center in Diamond
Author(s) -
Kennedy T.A.,
Charnock F.T.,
Colton J.S.,
Butler J.E.,
Linares R.C.,
Doering P.J.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200210)233:3<416::aid-pssb416>3.0.co;2-r
Subject(s) - diamond , nitrogen vacancy center , qubit , quantum decoherence , phase qubit , atomic physics , physics , microwave , charge qubit , photoluminescence , spin (aerodynamics) , flux qubit , condensed matter physics , electron , materials science , optoelectronics , quantum mechanics , quantum , composite material , thermodynamics
A concept combining optics and microwave pulses with the negative charge‐state of the nitrogen‐vacancy (NV — ) center in diamond is demonstrated through experiments that are equivalent to single‐qubit gates, and decoherence for this qubit is examined. The spin levels of the ground state provide the two‐level system. Optical excitation provides polarization of these states. The polarized state is operated coherently by 35 GHz microwave pulses. The final state is read out through the photoluminescence intensity. Decoherence arises from different sources for different samples. For high‐pressure, high‐temperature synthetic diamonds, the high concentration of substitutional N limits the phase‐memory to a few μs. In a single‐crystal CVD diamond, the phase memory time is at least 32 μs at 100 K. 14 N is tightly coupled to the electronic spin and produces modulation of the electron–spin echo decay under certain conditions. A two‐qubit gate is proposed using this nuclear spin. This demonstration provides a great deal of insight into quantum devices in the solid state with some possibility for real application.