Coherent-state linear optical quantum computing gates using simplified diagonal superposition resource states
- Centre for Quantum Computer Technology, Department of Physics, University of Queensland, St Lucia, QLD 4072 (Australia)
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) vertical bar 1>] approximates well an odd superposition of coherent states (vertical bar {alpha}>- vertical bar -{alpha}>) to address the diagonal resource problem. The approximation only holds for relatively small {alpha}, 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.
- OSTI ID:
- 20650343
- Journal Information:
- Physical Review. A, Vol. 71, Issue 3; Other Information: DOI: 10.1103/PhysRevA.71.032305; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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