Ultrafast all-optical coherent control of single silicon vacancy colour centres in diamond.

ABSTRACT: Complete control of the state of a quantum bit (qubit) is a fundamental requirement for any quantum information processing (QIP) system. In this context, all-optical control techniques offer the advantage of a well-localized and potentially ultrafast manipulation of individual qubits in multi-qubit systems. Recently, the negatively charged silicon vacancy centre (SiV^-) in diamond has emerged as a novel promising system for QIP due to its superior spectral properties and advantageous electronic structure, offering an optically accessible ?-type level system with large orbital splittings. Here, we report on all-optical resonant as well as Raman-based coherent control of a single SiV^- using ultrafast pulses as short as 1?ps, significantly faster than the centre's phonon-limited ground state coherence time of about 40?ns. These measurements prove the accessibility of a complete set of single-qubit operations relying solely on optical fields and pave the way for high-speed QIP applications using SiV^- centres.

SUBMITTER: Becker JN 

PROVIDER: S-EPMC5114561 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature