Cooling a levitating nanodiamond containing a spin qubit
Single nitrogen-vacancy (NV-) centres in diamond have isolated electronic and nuclear spins which can store quantum information at room temperature for over one second. We have built an experiment to study nanodiamonds while they are levitated by a focused laser beam. Theoretical proposals from our collaboration suggest that we could put these diamonds into a quantum superposition in which they try out being in two places at once. With our collaborators we have made nanodiamonds that are 1000 times purer than commercially-available nanodiamonds, so they don’t overheat when we shine in light. Our latest paper proposes the use of helium gas to cool the levitated diamonds, extending their quantum coherence.
The goal of this PhD project is to build in and test this helium gas cooling inside of a magnetogravitational trap. This trap is beneficial as it can levitate nanodiamonds without heating them up. After cooling the diamonds, you will measure the spin coherence time of the NV- centres, which will reveal how long is available for creating macroscopic superposition states. The long-term vision for this research is to better understand fundamental physics by testing what is the most macroscopic Schrödinger cat state that can be created. This could help to solve the quantum measurement problem: why do systems evolving according to the Schrödinger equation suddenly experience a measurement?
For informal enquiries, please contact [Email Address Removed].
A full 4 year studentship for UK students (fees and maintenance) is available. Candidates should hold or expect to hold a 1st (or high 2.1) in Physics or related subject area. You would start on your project in the lab from day one without doing an initial Masters course. See http://www2.warwick.ac.uk/fac/sci/physics/prospective/postgraduate/pgintro/projects/priority/ for further details.
The Physics department is proud to be an IOP Juno Champion and a winner of an Athena Swan Silver Award, reflecting our commitment to equal opportunity and to fostering an environment in which all can excel.
How good is research at University of Warwick in Physics?
FTE Category A staff submitted: 54.60
Research output data provided by the Research Excellence Framework (REF)
Click here to see the results for all UK universities