Journal
OPTICS COMMUNICATIONS
Volume 283, Issue 5, Pages 695-712Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2009.10.065
Keywords
Interferometry; Phase estimation; Quantum circuits; Disentanglement
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Funding
- U.S. Office of Naval Research [N00014-07-1-0304]
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Atomic (qubit) and optical or microwave (modal) phase-estimation protocols are placed on the same footing in terms of quantum-circuit diagrams. Circuit equivalences are used to demonstrate the equivalence of protocols that achieve the Heisenberg limit by employing entangled superpositions of Fock states, such as NOON states. The key equivalences are those that disentangle a circuit so that phase information is written exclusively on a mode or modes or on a qubit. The Fock-state-superposition phase-estimation circuits are converted to use entangled coherent-state superpositions: the resulting protocols are more amenable to realization in the lab, particularly in a qubit/cavity setting at microwave frequencies. (C) 2009 Elsevier B.V. All rights reserved.
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