期刊
PHYSICS LETTERS A
卷 367, 期 1-2, 页码 47-51出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2007.02.069
关键词
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We present a derivation and numerous applications of a compact explicit formula for the average fidelity of a quantum operation on a finite-dimensional quantum system. The formula can be applied to averages over particularly relevant subspaces; it is easily generalized to multicomponent systems, and as a special result, we show that when the same completely positive trace-preserving map is applied to a large number of qubits with one-bit fidelity F close to unity, the average fidelity of the operation on the full K-bit register scales as F-3K/2. (c) 2007 Elsevier B.V. All rights reserved.
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