Home | About Journal | Web Links | E-mail Alerts | RSS RSS Icon | Browse

Experimental Test of Fidelity Limits in Six-Photon Interferometry and of Rotational Invariance Properties of the Photonic Six-Qubit Entanglement Singlet State

Source: Phys. Rev. Lett. 103, 150501 (2009); doi:10.1103/PhysRevLett.103.150501

Published 5 October 2009

PACS
  • 03.67.Mn
    Entanglement measures, witnesses, and other characterizations (quantum information)
  • 03.65.Ta
    Foundations of quantum mechanics; measurement theory
  • 03.67.Hk
    Quantum communication
  • 42.50.Xa
    Optical tests of quantum theory
  • YEAR: 2009
RELATED DATABASES

To view database links for this article,
you need to log in.
To view database links for this article,
you need to log in.
PUBLICATION DATA
Publisher:
AIP is a member of CrossRef APS
Magnus Rådmark,1 Marek Żukowski,2 and Mohamed Bourennane1
1Physics Department, Stockholm University, SE-10691 Stockholm, Sweden
2Institute for Theoretical Physics and Astrophysics, Uniwersytet Gdański, PL-80-952 Gdańsk, Poland
Quantum multiphoton interferometry has now reached the six-photon stage. Thus far, the observed fidelities of entangled states never reached 2/3. We report a high fidelity (estimated at 88%) experiment in which six-qubit singlet correlations were observed. With such a high fidelity we are able to demonstrate the central property of these “singlet” correlations, their “rotational invariance,” by performing a full set of measurements in three complementary polarization bases. The patterns are almost indistinguishable. The data reveal genuine six-photon entanglement. We also study several five-photon states, which result upon detection of one of the photons. Multiphoton singlet states survive some types of depolarization and are thus important in quantum communication schemes. ©2009 The American Physical Society
History: Received 18 March 2009; published 5 October 2009
Permalink: http://link.aps.org/abstract/PRL/v103/e150501

REFERENCES (22)

For access to fully linked references, you need to log in. For access to fully linked references, you need to Log in.
  1. W. H. Zurek, Phys. Today 44, No. 10, 36 (1991).
  2. P. Zanardi and M. Rasetti, Phys. Rev. Lett. 79, 3306 (1997).
  3. D. A. Lidar, I. L. Chuang, and K. B. Whaley, Phys. Rev. Lett. 81, 2594 (1998).
  4. M. Bourennane et al., Phys. Rev. Lett. 92, 107901 (2004).
  5. A. Cabello, Phys. Rev. A 75, 020301(R) (2007).
  6. M. Hillery, V. Buzek, and A. Berthiaume, Phys. Rev. A 59, 1829 (1999).
  7. S. Gaertner et al., Phys. Rev. Lett. 98, 020503 (2007).
  8. R. Prevedel et al., Phys. Rev. Lett. 103, 020503 (2009).
  9. W. Wieczorek et al., Phys. Rev. Lett. 103, 020504 (2009).
  10. H. Weinfurter and M. Żukowski, Phys. Rev. A 64, 010102(R) (2001).
  11. M. Bourennane et al., Phys. Rev. Lett. 96, 100502 (2006).
  12. M. Bourennane et al., Phys. Rev. Lett. 92, 087902 (2004).
  13. G. Toth and O. Guehne, Phys. Rev. Lett. 95, 120405 (2005).
ADVERTISEMENT