Quantum information processing using frequency control of impurity spins in diamond

A. M. Zagoskin, J. R. Johansson, Sahel Ashhab, Franco Nori

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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 provide a theoretical demonstration, 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.

Original languageEnglish
Article number014122
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number1
DOIs
Publication statusPublished - 30 Jul 2007
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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