Long-range photon-mediated gate scheme between nuclear spin qubits in diamond
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2016-01-04 |
| Journal | Physical review. B./Physical review. B |
| Authors | Adrian Auer, Guido Burkard |
| Institutions | University of Konstanz |
| Citations | 11 |
Abstract
Section titled āAbstractāDefect centers in diamond are exceptional solid-state quantum systems that\ncan have exceedingly long electron and nuclear spin coherence times. So far,\nsingle-qubit gates for the nitrogen nuclear spin, a two-qubit gate with a\nnitrogen-vacancy (NV) center electron spin, and entanglement between nearby\nnitrogen nuclear spins have been demonstrated. Here, we develop a scheme to\nimplement a universal two-qubit gate between two distant nitrogen nuclear\nspins. Virtual excitation of an NV center that is embedded in an optical cavity\ncan scatter a laser photon into the cavity mode; we show that this process\ndepends on the nuclear spin state of the nitrogen atom. If two NV centers are\nsimultaneously coupled to a common cavity mode and individually excited,\nvirtual cavity photon exchange can mediate an effective interaction between the\nnuclear spin qubits, conditioned on the spin state of both nuclei, which\nimplements a universal controlled-$\textit{Z}$ gate. We predict operation times\nbelow 100 nanoseconds, which is several orders of magnitude faster than the\ndecoherence time of nuclear spin qubits in diamond.\n