Quantum information processing using frequency control of impurity spins in diamond

Abstract

Spin degrees of freedom of charged nitrogen-vacancy (NV${}^{-}$) centers in diamond have large decoherence times even at room temperature, can be initialized and read out using optical fields, and are therefore a promising candidate for solid state qubits. Recently, quantum manipulations of NV${}^{-}$- centers using RF fields were experimentally realized. In this paper we show; first, that such operations can be controlled by varying the frequency of the signal, instead of its amplitude, and NV${}^{-}$- centers can be selectively addressed even with spacially uniform RF signals; second, that when several \NV - centers are placed in an off-resonance optical cavity, a similar application of classical optical fields provides a controlled coupling and enables a universal two-qubit gate (CPHASE). RF and optical control together promise a scalable quantum computing architecture.

References in corpus (6)

• Superconducting Circuits and Quantum Information
• Stark shift control of single optical centers in diamond
• Polarization and readout of coupled single spins in diamond
• Two-level systems driven by large-amplitude fields
• Room-temperature manipulation and decoherence of a single spin in diamond
• Quantum two-level systems in Josephson junctions as naturally formed qubits