Characterization of nonlocal gates

Hammerer, K., Vidal, G. and Cirac, J. I. (2002) Characterization of nonlocal gates. Physical Review A, 66 6: 062321-1-062321-13. doi:10.1103/PhysRevA.66.062321

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Author Hammerer, K.
Vidal, G.
Cirac, J. I.
Title Characterization of nonlocal gates
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2002
Sub-type Article (original research)
DOI 10.1103/PhysRevA.66.062321
Open Access Status File (Publisher version)
Volume 66
Issue 6
Start page 062321-1
End page 062321-13
Total pages 13
Place of publication College Park, MD, United States
Publisher The American Physical Society
Language eng
Abstract A nonlocal unitary transformation of two-qubits occurs when some Hamiltonian interaction couples them. Here we characterize the amount, as measured by time, of interaction required to perform two-qubit gates, when also arbitrarily fast, local unitary transformations can be applied on each qubit. The minimal required time of interaction, or interaction cost, defines an operational notion of the degree of nonlocality of gates. We characterize a partial order structure based on this notion. We also investigate the interaction cost of several communication tasks, and determine which gates are able to accomplish them. This classifies two-qubit gates into four categories, differing in their capability to transmit classical, as well as quantum, bits of information.
Keyword Optics
Physics, Atomic, Molecular & Chemical
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 51 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 19 Sep 2007, 15:13:17 EST