Jason Smith, University of Oxford

Many proposed quantum information systems for communications and computing rely on efficient transfer of information between optical and spin degrees of freedom. Diamond colour centres are excellent candidates for such interfaces, as they can combine highly coherent spin states coupled selectively to coherent optical transitions. Proof-of-concept experiments with nitrogen vacancy (NV) centres have shown that spins can be entangled over km distances and quantum information stored for over a minute. In order to advance towards practical devices, two of the principal challenges are the engineering of diamond materials to allow large scale parallelisation, and the engineering of devices to improve the spin-photon coupling efficiency. In this webinar I will discuss recent efforts directed at both of these challenges, focusing on the controlled writing of colour centres into diamond and the construction of optical micro cavity devices to control spontaneous emission. Along the way we will find that despite NV centres being among the most intensively studied of all crystal defects, there are still many things about them that we don’t yet understand!

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