Dresden 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 82: Quantum Information Systems

HL 82.2: Vortrag

Freitag, 24. März 2017, 09:45–10:00, POT 81

Cavity mediated entanglement generation between the electron spins of two NV⁻ centers — •Vladislav Shkolnikov¹, Guido Burkard¹, and David Awschalom² — ¹Department of Physics, University of Konstanz, D-78457 Konstanz, Germany — ²Institute for Molecular Engineering, University of Chicago, Chicago, IL 60637, USA

While long spin coherence times and efficient single-qubit quantum control have been implemented successfully in negatively charged nitrogen-vacancy (NV) centers in diamond, the controlled coupling of remote NV spin qubits remains challenging. Here, we propose and analyze a controlled-phase (CPHASE) gate for the spins of two NV-centers embedded in a common optical cavity and driven by two off-resonant lasers. The excitation of the first NV, generated by the laser, can later be emited into the cavity and then reabsorbed by the second NV. The excited states in this process are only virtually occupied and it allows to generate entangling gate between the NV-centers, that is not limited by the excited state lifetime. We derive an analytical model for the case when spin-spin interaction in the excited state can be neglected and perform a numerical simulation taking it into account. We predict entangling gates with the operation time 500 ns, which is much smaller than spin coherence time in the NVs. In combination with previously demonstrated single-qubit gates, CPHASE allows for arbitrary quantum computations.