New J. Phys. 11 (September 2009) 093012 (9pp) doi: 10.1088/1367-2630/11/9/093012
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
1 Centre for Quantum Computer Technology, Department of Physics, University of Queensland, QLD 4072, Brisbane, Australia
2 Groupe d'Optique Quantique, Laboratoire Charles Fabry, Institut d'Optique, 91127 Palaiseau, France
3 Physics Department, Truman State University, Kirksville, MO 63501, USA
4 Author to whom any correspondence should be addressed.
E-mail: marco.barbieri@institutoptique.frAbstract.
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.
Received 1 May 2009
Published 14 September 2009
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