CaltechAUTHORS
  A Caltech Library Service

Broadband teleportation

van Loock, P. and Braunstein, Samuel L. and Kimble, H. J. (2000) Broadband teleportation. Physical Review A, 62 (2). Art. No. 022309. ISSN 1050-2947. http://resolver.caltech.edu/CaltechAUTHORS:LOOpra00

[img]
Preview
PDF
See Usage Policy.

212Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:LOOpra00

Abstract

Quantum teleportation of an unknown broadband electromagnetic field is investigated. The continuous-variable teleportation protocol by Braunstein and Kimble [Phys. Rev. Lett. 80, 869 (1998)] for teleporting the quantum state of a single mode of the electromagnetic field is generalized for the case of a multimode field with finite bandwith. We discuss criteria for continuous-variable teleportation with various sets of input states and apply them to the teleportation of broadband fields. We first consider as a set of input fields (from which an independent state preparer draws the inputs to be teleported) arbitrary pure Gaussian states with unknown coherent amplitude (squeezed or coherent states). This set of input states, further restricted to an alphabet of coherent states, was used in the experiment by Furusawa et al. [Science 282, 706 (1998)]. It requires unit-gain teleportation for optimizing the teleportation fidelity. In our broadband scheme, the excess noise added through unit-gain teleportation due to the finite degree of the squeezed-state entanglement is just twice the (entanglement) source’s squeezing spectrum for its “quiet quadrature.” The teleportation of one half of an entangled state (two-mode squeezed vacuum state), i.e., “entanglement swapping,” and its verification are optimized under a certain nonunit gain condition. We will also give a broadband description of this continuous-variable entanglement swapping based on the single-mode scheme by van Loock and Braunstein [Phys. Rev. A 61, 10 302 (2000)].


Item Type:Article
Additional Information:©2000 The American Physical Society Received 1 February 1999; published 18 July 2000 The authors would like to thank C. M. Caves for helpful suggestions. P.v.L. thanks T. C. Ralph, H. Weinfurter, and A. Sizmann for their help. This work was supported by EPSRC Grant No. GR/L91344. P.v.L. was funded in part by a "DAAD Doktorandenstipendium im Rahmen des gemeinsamen Hochschulsonderprogramms III von Bund und Laendern." H.J.K. is supported by DARPA via the QUIC Institute which is administered by ARO, by the National Science Foundation, and by the Office of Naval Research.
Issue or Number:2
Record Number:CaltechAUTHORS:LOOpra00
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:LOOpra00
Alternative URL:http://dx.doi.org/10.1103/PhysRevA.62.022309
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2751
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:25 Apr 2006
Last Modified:26 Dec 2012 08:50

Repository Staff Only: item control page