Coherent-state linear optical quantum computing gates using simplified diagonal superposition resource states
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In this paper we explore the possibility of fundamental tests for coherent-state optical quantum computing gates [T. C. Ralph et al., Phys. Rev. A 68, 042319 (2003)] using sophisticated but not unrealistic quantum states. The major resource required in these gates is a state diagonal to the basis states. We use the recent observation that a squeezed single-photon state [S(r)|1?] approximates well an odd superposition of coherent states (|a?-|-a?) to address the diagonal resource problem. The approximation only holds for relatively small a , and hence these gates cannot be used in a scalable scheme. We explore the effects on fidelities and probabilities in teleportation and a rotated Hadamard gate.
Physical Review A (Atomic, Molecular and Optical Physics)
Copyright 2005 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.