962 resultados para theoretic limit
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Cover has imprint: Burlington : C. Goodrich, 1838.
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Presented at the Conference on Evaluating Manpower Training Programs, May 6-7, 1976 sponsored by Industrial Relations Section, Princeton University and Office of the Assistant Secretary for Policy, Evaluation and Research, Dept. of Labor.
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Includes indexes.
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Robert L. Doughton, chairman.
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"B-274166"--P. [1].
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"B-276401"--P. 1.
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Bennett Champ Clark, chairman of subcommittee.
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We introduce methods for clock synchronization that make use of the adiabatic exchange of nondegenerate two-level quantum systems: ticking qubits. Schemes involving the exchange of N independent qubits with frequency omega give a synchronization accuracy that scales as (omega root N)(-1)-i.e., as the standard quantum limit. We introduce a protocol that makes use of N-c coherent exchanges of a single qubit at frequency omega, leading to an accuracy that scales as (omega N-c)(-1) ln N-c. This protocol beats the standard quantum limit without the use of entanglement, and we argue that this scaling is the fundamental limit for clock synchronization allowed by quantum mechanics. We analyze the performance of these protocols when used with a lossy channel.