Measurement of the entanglement of two superconducting qubits via state tomography

Science

Volumn 313, Issue 5792, 2006, Pages 1423-1425

  Steffen, Matthias ^a,b   Ansmann, M ^a   Bialczak, Radoslaw C ^a   Katz, H ^a   Lucero, Erik ^a   McDermott, R ^a   Neeley, Matthew ^a   Weig, E M ^a   Cleland, A N ^a   Martinis, John M ^a  

^a UNIVERSITY OF CALIFORNIA   (United States)

^b IBM T J WATSON RESEARCH CENTER   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

MATRIX ALGEBRA; SUPERCONDUCTING MATERIALS; TOMOGRAPHY;

CAPACITIVE COUPLING; QUANTUM ENTANGLEMENT; STATE TOMOGRAPHY; SUPERCONDUCTING QUBITS;

QUANTUM THEORY;

MEASUREMENT METHOD; RESOURCE; SOLID; SUPERCONDUCTIVITY; TOMOGRAPHY;

ARTICLE; PHASE SEPARATION; PRIORITY JOURNAL; QUANTUM MECHANICS; SOLID STATE; SUPERCONDUCTOR;

EID: 33748517413     PISSN: 00368075     EISSN: 10959203     Source Type: Journal    
DOI: 10.1126/science.1130886     Document Type: Article

References (21)

1. M. A. Nielsen, I. L. Chuang, Quantum Computation and Quantum Information (Cambridge Univ. Press, Cambridge, 2000).
2. H. Häffner et al., Nature 438, 643 (2005).
3. D. Leibfried et al., Nature 438, 639 (2005).
4. D. P. DiVincenzo, Fortschr. Phys. 48, 771 (2000).
5. R. McDermott et al., Science 307, 1299 (2005).
6. T. Yamamoto et al., Nature 425, 941 (2003).
7. D. Vion et al., Science 296, 886 (2002).
8. I. Chiorescu, Y. Nakamura, C. J. P. M. Harman, J. E. Mooij, Science 299, 1869 (2003); published online 13 February 2003 (10.1126/science.1081045).
9. A. Wallraff et al., Phys. Rev. Lett. 95, 060501 (2005).
10. M. Geller et al., personal communication.
11. M. Steffen et al., Phys. Rev. Lett. 97, 050502 (2006).
12. M. Steffen, J. M. Martinis, I. L Chuang, Phys. Rev. B 68, 224518 (2003).
13. Materials and methods are available as supporting material on Science Online.
14. N. Schuch, J. Siewert, Phys. Rev. A. 67, 032301 (2003).
15. A. J. Berkley et al., Science 300, 1548 (2003); published online 15 May 2003 (10.1126/science.1084528).
16. L. M. K. Vandersypen et al., Nature 414, 883 (2001).
17. L. M. K. Vandersypen et al., Appl. Phys. Lett. 76, 646 (2000).
18. th) = 0.61.
19. J. M. Martinis et al., Phys. Rev. Lett. 95, 210503 (2005).
20. W. K. Wootters, Quantum Inf. Comput. 1, 27 (2001).
21. We acknowledge S. Waltman and the National Institute of Standards and Technology for support in building the microwave electronics. Devices were made at the UCSB and Cornell Nanofabrication Facilities, a part of the NSF-funded National Nanotechnology Infrastructure Network. N.K. acknowledges support of the Rothschild fellowship. This work was supported by Disruptive Technology Office under grant W911NF-04-1-0204 and by NSF under grant CCF-0507227.