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quant-ph2013★ 27 cited
Quantum Optical State Comparison Amplifier
Electra Eleftheriadou, Stephen M. Barnett, John Jeffers
It is a fundamental principle of quantum theory that an unknown state cannot be copied or, as a consequence, an unknown optical signal cannot be amplified deterministically and per…
quant-ph2013
Quantum probability rule: a generalisation of the theorems of Gleason and Busch
Stephen M. Barnett, James D. Cresser, John Jeffers +1
Busch's theorem deriving the standard quantum probability rule can be regarded as a more general form of Gleason's theorem. Here we show that a further generalisation is possible b…