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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Complementarity in variable strength quantum non-demolition measurements

M Barbieri1,2,4, M E Goggin1,3, M P Almeida1, B P Lanyon1 and A G White1

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Using a linear optic quantum gate we perform a variable strength quantum non-demolition measurement, to elucidate the role of which-path knowledge in a complementarity experiment. Specifically, we demonstrate that the entanglement created by the measurement interaction prevents an exhaustive description in terms of complementary wave-like and particle-like behaviour of a single photon in an interferometer.


PACS

03.67.Lx Quantum computation architectures and implementations

03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.)

03.67.Mn Entanglement measures, witnesses, and other characterizations

42.50.Ar Photon statistics and coherence theory

Subjects

Computational physics

Optics, quantum optics and lasers

Quantum information and quantum mechanics

Dates

Issue 9 (September 2009)

Received 1 May 2009

Published 14 September 2009



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