de.mpg.escidoc.pubman.appbase.FacesBean
English
 
Help Guide Disclaimer Contact us Login
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Interaction cost of nonlocal gates

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons60540

Hammerer,  Klemens
Theory, Max Planck Institute of Quantum Optics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons60441

Cirac,  J. Ignacio
Theory, Max Planck Institute of Quantum Optics, Max Planck Society;

Locator
There are no locators available
Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)
There is no public supplementary material available
Citation

Vidal, G., Hammerer, K., & Cirac, J. I. (2002). Interaction cost of nonlocal gates. Physical Review Letters, 88(23): 237902. 237902. Retrieved from http://link.aps.org/abstract/PRL/v88/e237902.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-C20B-6
Abstract
We introduce the interaction cost of a nonlocal gate as the minimal time of interaction required to perform the gate when assisting the process with fast local unitaries. This cost, of interest both in the areas of quantum control and quantum information, depends on the specific interaction, and allows one to compare in an operationally meaningful manner any two nonlocal gates. In the case of a two-qubit system, an analytical expression for the interaction cost of any unitary operation given any coupling Hamiltonian is obtained. One gate may be more time consuming than another for any possible interaction. This defines a partial order structure in the set of nonlocal gates, that compares their degree of nonlocality. We analytically characterize this partial order in a region of the set of two-qubit gates.