Interfacing NV center spin to diamond mechanical resonator enables the construction of a hybrid quantum mechanical system. We are interested in studying NV center electron–phonon interaction in such systems for several reasons: For NV center themselves, strain adds as a new way to control NV center spin/orbital states (that are in accessible by magnetic dipole […]

Solid state defect spins are sensitive to ambient field fluctuations, for example, magnetic field through Zeeman effect. Change in magnetic field amplitude at the spin location directly affects the spin transition energy as well as the larmor precession rate of the spin. Destructive interference of different precession rate can thus cause decoherence of the spin […]

In 1935, EPR proposed local realism hypothesis to opposes the quantum mechanical description of the nature. However, as the experimental proof of Bell inequality, where quantum entangled states show stronger correlation than any hidden-variable theory could predict (More info), the spooky interaction at distance of entangled quantum states hence established the credibility of quantum mechanics and laid the foundation for many […]

MEMS (microelectromechanical systems) are prevalent in everyday life. Every smart phone manufactured today has a MEMS gyroscope built in, and MEMS processor for wireless signal filtering. They are high quality filters, precise sensors with low power consumption. Small as they are already, the footprint of the current MEMS device are still on the order of 100 um. […]

I made this video to illustrate the fabrication process flow of an SCHBAR. A micro-sized piezoelectric bulk acoustic resonator made of diamond/SiC, with f*Q>10^12/10^13.

Quantum technologies today are built on spin flips of electrons/ions and coupled qubit system through entanglement. A spin filp can be triggered by a coupled resonant field transverse to the quantization axis. Microwaves are popularly used for electron spin manipulation, while RF fields are found more applications in altering ion states.  The hyperfine structure of an […]

In my Ph.D. thesis project, my research focuses on the study of diamond NV center electron spin/orbital dynamics and their coupling to strain/phonon in the host diamond substrate. We engineer diamond MEMS devices and develop novel acoustic quantum control method to NV centers.  NV centers are atomic defects in diamond, consisting a carbon lattice vacancy and […]