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Nature Photonics 3, 317–319 (1 June 2009) | doi:10.1038/nphoton.2009.84

Quantum photonics: Quantum optics on a chip

Dominic W. Berry & Howard M. Wiseman

In the latest work from the quantum photonics group at the University of Bristol, described on page 346 of this issue, Jonathan Matthews and colleagues report the construction of a reconfigurable quantum optical circuit on a chip and the control of entangled states with up to four photons. The heart of their device is a simple heating element that changes the phase in one arm of an interferometer.