Pittman, T. P.Jacobs, B. C.Franson, J.D.2020-07-302020-07-302002-06-06T. B. Pittman, B. C. Jacobs, and J. D. Franson, Demonstration of Nondeterministic Quantum Logic Operations Using Linear Optical Elements, Phys. Rev. Lett. 88, 257902, https://doi.org/10.1103/PhysRevLett.88.257902https://doi.org/10.1103/PhysRevLett.88.257902http://hdl.handle.net/11603/19289Knill, 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 1/4.4 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.©2002 The American Physical SocietyText