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Quantum sensing with single spins

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  • UserCristian Bonato (Heriot-Watt)
  • ClockWednesday 03 October 2018, 13:00-14:00
  • HousePhysics East 217.

If you have a question about this talk, please contact Dr Giovanni Barontini.

Sensors based on individual quantum systems provide measurements of physical quantities combining nanoscale spatial resolution and high sensitivity. For example, quantum sensing based on single spins associated with nitrogen-vacancy centres in diamond has already reached outstanding milestones in mapping nanoscale magnetic fields of interest for materials science and biology.

In the first part of the talk, I will discuss our experimental1 and theoretical [2,3] work about enhancing the performance of quantum sensors through Bayesian estimation and real-time feedback. Bayesian estimation is an efficient tool to exploit all information available from experimental measurements, while additionally enabling ‘on-the-fly’ adaptation of the measurement settings to deliver, at each point in time, optimal information extraction based on the knowledge accumulated so far.

In the second part, I will introduce novel spin qubits associated to defects in silicon carbide [4], a semiconductor of wide industrial interest for micro-electronics, and I will discuss how they can be exploited to sense parameters related to SiC electronic devices with high spatial resolution.

[1] C. Bonato et al, Nature Nanotech 11, 247 (2016)

[2] C. Bonato et al, Phys Rev A 95 , 052348 (2017)

[3] HT Dinani et al, arXiv:1806.01249 (2018)

[4] R. Nagy et al, Phys Rev Appl 9, 034022 (2018)

This talk is part of the Cold atoms series.

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