Manipulation of solid-state spins in diamonds for sensing applications and quantum optics studies
Abstract:
The triplet ground electronic spin (S=1) of a negatively charged
nitrogen vacancy color center (NVC) in a diamond presents an attractive
candidate for encoding a frequency qubit (2.87 GHz), for it possesses
a remarkably long coherence time even in room temperatures, and the
simple electronic structure of the NVC allows optical detection of
the qubit states. On the other hand the frequency of the qubit can
be shifted due to changes of environment parameters, including magnetic
and electric fields, applied stress, and temperature. Thus an NVC can
also be utilized as a sensitive environment probe.
In this talk, we will report our recent work on time-resolved temperature
sensing utilizing nano-diamonds, in which temperature sensitivity of
1 K with a temporal resolution up to microsecond was achieved. Our
demonstration provides a good starting point for sensing applications.
On the quantum optics studies, we are interested in achieving a strong
coupling between an ensemble of NV centers in a diamond crystal and a
moderate finesse cavity for few-photon nonlinear optics studies, toward
quantum optics and quantum information applications. We will present our
current results and outline our future plans.
