A new spin on quantum sensing with diamond
Physics South Building
We often enter the rotating frame on paper with cheerful abandon, confident that it's a way of simplifying a problem. But what happens when a qubit is physically rotated? Rotation leads to the emergence of "ficititious" magnetic pseudo-fields in the rotating frame, which nevertheless have real, measurable effects. The nitrogen-vacancy (NV) centre in diamond is an ideal qubit to study rotation. However, there are considerable experimental challenges, such as how to realise preparation, control and readout of qubits rotating with a period comparable to the NV coherence time of a few hundred microseconds. In the first part of this talk, I discuss experiments where we show quantum state control and readout of single NV centres rotating at speeds in excess of 200,000 rpm. In the second part, we study the appearance of magnetic pseudo-fields in an NV-nuclear spin system rotating at up to 330,000 rpm. Not only can the NV spin detect these effective magnetic fields via the nuclear spins, but it is also a unique system where rotation can be used as a new method of engineering quantum coherence in electron-nuclear systems.
Dr Alexander Wood, School of Physics, University of Melbourne