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attocube optics photo by Gavin Morley

Available now:

Fully-funded 4-year DST CDT PhD studentship to start in October 2017:

Magnetometry with an ensemble of nitrogen-vacancy centres in diamond

with support from Element Six.

Supervisor: Gavin Morley

Nitrogen-vacancy (NV-) centres in diamond are marvellous quantum bits: we control and optically probe single spins with long coherence times at room temperature. We use these spins to detect the local magnetic field for nanoscale magnetometry. To increase the sensitivity (while sacrificing spatial resolution) we use diamonds with a large ensemble of NV- centres. Researchers in Ulm have shown how these magnetometry techniques can be used to detect magnetic signals with very high frequency resolution: better than a mHz. This has already been used to detect NMR, but only at low magnetic fields below 0.1 T. We will develop our ensemble magnetometer and use it inside our high field magnet at 6.66 T. NMR reveals the quantum structure of samples by measuring spectra. More interesting samples are more complex, with correspondingly more resonances, and higher magnetic fields are required to resolve these resonances. We have developed world-leading equipment for EPR and NMR at high magnetic fields, including the most precise EPR spectrometer ever. Additionally we do NV- optically-detected magnetic resonance (ODMR) at low magnetic fields. This project will combine these areas of expertise to study the behaviour of NV- centres at high magnetic fields, with a view to building a high-field NMR spectrometer with NV- ODMR detection.

Available shortly:

One PhD studentship to start in October 2018 without any CDT component.

Post-doctoral research associate positions on using single nitrogen vacancy centres in diamond or ensembles for magnetometry.

Available until recently:

Fully-funded 3.5 year PhD studentship to start October 2017 (position now filled)

Building a node in a diamond quantum computer

Supervisor: Gavin Morley (Warwick Physics)
Second supervisors: Mark Newton and Animesh Datta (Warwick Physics)

If a quantum computer could be built with enough qubits, it would be able to solve problems that are intractable with the classical computers we have now. A leading design for this is to build nodes with five or more interacting qubits, and then link up many of these nodes. Nitrogen vacancy centres (NVC) in diamond at cryogenic temperatures have been used to demonstrate this linking by entangling their electron spins optically. The nuclear spins coupled to NVC can have long coherence times of over 10 seconds.

In this project we will create a single node with five or more qubits using a single NVC and the 13C nuclear spins close to it. We have built most of the equipment and will soon begin testing it at a temperature of 4 K. In addition to being useful as a node in a quantum computer, we will explore how these coupled spins could be used as a sensitive nanoscale magnetometer.

We have also built related experiments including versions that operate only at room temperature, only with a large ensemble of NVC, and only with optically-levitated nanodiamonds. We collaborate with Jason Smith’s group in Oxford because they are working on speeding up the optical entanglement of two NVC as part of the Networked Quantum Information Technology (NQIT) program: the UK National Quantum Technology Hub for Quantum Computing. This PhD studentship is fully funded by the EPSRC through NQIT.

For more details please contact Gavin Morley:

NQIT logo EPSRC logo 2