Abstract
Two experimental arrangements consisting of coupled spontaneous parametric down-converters with type-I phase matching pumped simultaneously by a powerful optical field in a coherent state through a balanced beam splitter and linear optical elements are proposed for conditional preparation of macroscopic entangled states in output pumping modes of the studied system. Successful generation of the macroscopic entangled state in the pumping modes is unambiguously heralded by coincident detection of two photons in the generated signal and idler modes of the system. We calculate the amount of entanglement and probabilities of successfully observing the X (2) macroscopic entangled states in the total wavefunction. We show that the proposed schemes can be used to obtain a new type of macroscopic entangled states.
Similar content being viewed by others
References
P. W. Shor, SIAM J. Comput. 26, 1484 (1997).
L. K. Glover, Phys. Rev. Lett. 79, 325 (1997).
A. Ekert, Phys. Rev. Lett. 67, 661 (1991).
C. Benett, G. Brassard, C. Crepeau, et al., Phys. Rev. Lett. 70, 1895 (1993).
P. G. Kwiat, K. Mattle, H. Weinfurter, et al., Phys. Rev. Lett. 75, 4337 (1995).
P. Kok and S. L. Braunstein, Phys. Rev. A 61, 042304 (2000); 62, 064301 (2000).
J. F. Clauser, M. A. Horne, A. Shimony, and R. A. Holt, Phys. Rev. Lett. 23, 880 (1969).
D. Bouwmeester et al., Nature 390, 575 (1997); S. L. Braunstein and H. J. Kimble, Nature 394, 840 (1998).
D. Gottesman and I. L. Chuang, Nature 42, 390 (1999); E. Knill, R. Laflamme, and G. J. Milburn, Nature 409, 46 (2001).
C. Sliwa and K. Banaszek, Phys. Rev. A 67, 030301(R) (2003).
S. A. Podoshvedov, J. W. Noh, and K. S. Kim, Opt. Commun. 221, 121 (2003).
B. Yurke and D. Stoler, Phys. Rev. Lett. 57, 13 (1986).
X. Wang, Phys. Rev. A 64, 022302 (2001); S. J. van Enk and O. Hirota, Phys. Rev. A 64, 022313 (2001); S. J. van Enk, Phys. Rev. A 67, 022318 (2003).
H. Jeong and M. S. Kim, Phys. Rev. A 65, 042305 (2002).
S. Takeuchi et al., Appl. Phys. Lett. 74, 1063 (1993).
M. A. Nielsen and I. L. Chuang, Quantum Computation and Quantum Information (Cambridge Univ. Press, Cambridge, 2000).
D. F. Walls and G. J. Milburn, Quantum Optics (Springer, Berlin, 1994); Z. Y. Ou and L. Mandel, Phys. Rev. Lett. 61, 50 (1988).
S. K. Hong et al., Phys. Rev. Lett. 59, 2044 (1987).
Author information
Authors and Affiliations
Additional information
The text was submitted by author in English.