Director's Colloquium - School of Physics and Astronomy

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Event Details

17 August 2017 at 2:00 pm – 17 August 2017 at 3:00 pm
L1, Room 107, 10 College Walk
Other events; Seminars & Workshops


Prof. Myungshik Kim, Imperial College London

Single photon operations

Quantum mechanics says that a light field is composed of photons, but who cares about single photons while even a small laser pointer emits trillions of photons per second? Quantum optics researchers are now able to localize single photons for a test of various theories in fundamental physics including nonlocalities and the Schroedinger’s cat paradox. 

As well as the fundamental interests, there have been proposals and realizations of new technology based on single-photon operations for quantum key distributions and precision measurements. 

In this talk, we show how we can achieve operations at the single photon level. We then show what we can do with the single photons for the study of foundations and applications of quantum physics.


[1] V. Parigi et al, ‘Probing the quantum commutation rules by addition and subtraction of single photons to/from a light field’, Science 317, 1890 (2007).

[2] M. S. Kim et al., ‘Scheme for proving the bosonic commutation relation using single-photon interference’ Phys. Rev. Lett. 101, 260401 (2008).

[3] M.D. Vidrighin, ‘Photonic Maxwell’s demon’, Phys. Rev. Lett. in press (2016).

[4] A.S. Coelho et al, ‘universal continuous variable state orthogonalizer and qubit generator’, Phys. Rev. Lett. in press (2016).

Kavan Modi