OUR RESEARCH
Study of Spin Photon Interactions in Solids
Photon is the ideal "flying qubit", the messenger of quantum information. Spin qubits in solids is ideal "quantum memory" with long quantum coherent time. Thus, the key step is to study interactions between photon and spin and build interfaces based on it.
Here, our main focus is on nitrogen vacancy centers in diamond. It provides quantum hybrid (spin) system made of electron and nuclear spins. Although its electron spin is used for interaction with photons, for fast and high-fidelity control and for readout of the spin state, its surrounding nuclear spins are well-isolated from their environment and yield very long coherence times. Thus nuclear spins make natural candidates for information storage and electron spins for spin photon interface. In addition, electron and nuclear spins form a multiqubit quantum register allowing for quantum information processing.
We demonstrate the high-fidelity coherent transfer of a photon polarization state to a single solid-state nuclear spin that has a coherence time of over 10 s. The work paves the way towards an absorption-based quantum repeater network.
Reference: Nature Photonics 10, 507–511 (2016)