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Phys Rev Lett. 2002 Jun 24;88(25 Pt 1):257902. Epub 2002 Jun 6.

Demonstration of nondeterministic quantum logic operations using linear optical elements.

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  • 1The Johns Hopkins University, Applied Physics Laboratory, Laurel, Maryland 20723, USA.


Knill, Laflamme, and Milburn [Nature (London) 409, 46 (2001)] recently showed that nondeterministic quantum logic operations could be performed using linear optical elements, additional photons (ancilla), and postselection based on the output of single-photon detectors. Here we report the experimental demonstration of two logic devices of this kind, a destructive controlled-NOT (CNOT) gate and a quantum parity check. These two devices can be combined with a pair of entangled photons to implement a conventional (nondestructive) CNOT that succeeds with a probability of 1/4.

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