Year: 2007
Type: article
Abstract: Spin degrees of freedom of charged nitrogen-vacancy $({\mathrm{NV}}^{\ensuremath{-}})$ 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 ${\mathrm{NV}}^{\ensuremath{-}}$ 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 ${\mathrm{NV}}^{\ensuremath{-}}$ centers can be selectively addressed even with spacially uniform rf signals; second, that when several ${\mathrm{NV}}^{\ensuremath{-}}$ 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.
Source: Physical Review B
Institutions: University of British Columbia, RIKEN, University of Michigan
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2022294301