THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
And we have our special love with diamonds!
Solids state qubit based quantum sensing has emerged as one of the most promising quantum applications. We solve a bottle neck problem of short decoherent time of shallow implanted solid state qubit by a push pull method based on SPM instrumentation. The decoherence time increase dramatically, up to 20 folds. This method will pave the way of solid state quantum sensing.
The core of high-performance chip manufacturing is to pattern microscale and nanoscale material structures with high precision. We proposed and developed a single step laser direct writing technology. This method significantly simplifies electronics fabrication, especially for making quantum technology chips, flexible device and repairing circuits.
Material properties can change dramatically under pressure. We developed monitoring techniques based on nitrogen-vacancy (NV) centers in diamond. The NV centers can act as sensors because their energy levels and the associated spectra are sensitive to strain and magnetic fields. This enabled optical readout of a spatially resolved signal.
Long distance quantum communication requires photons and quantum nodes that comprise qubits for interaction with light, good memory capabilities and processing qubits for storage and manipulation of photons. Here, we demonstrate a high fidelity (~98%) coherent transfer of a photon polarisation state to a single solid state nuclear spin that has a coherence time of over 10 seconds. This nuclear spin based optical quantum memory demonstrated here paves the way towards an absorption based quantum repeater network.