Quantum state engineering with entangled squeezed states and photon number detector

Akira Kitagawa; Katsuji Yamamoto; Koji Nagata; Masahiro Takeoka; Masahide Sasaki

doi:10.1117/12.580852

11 January 2005 Quantum state engineering with entangled squeezed states and photon number detector

Akira Kitagawa, Katsuji Yamamoto, Koji Nagata, Masahiro Takeoka, Masahide Sasaki

Proceedings Volume 5631, Quantum Optics and Applications in Computing and Communications II; (2005) https://doi.org/10.1117/12.580852
Event: Photonics Asia, 2004, Beijing, China

Abstract

The photon subtraction operation is an effective method to enhance an entanglement of the two-mode squeezed vacuum state. We show that it can be well approximated to the two-mode squeezed state with an enhanced squeezing although it is basically a mixed and non-Gaussian state. Such property can be directly observed by the current technology. We also study the continuous variable quantum dense coding with the photon subtracted two-mode squeezed state. It is shown that, in particular squeezing region, its error probability performance can be greatly improved from the original two-mode squeezed state. Since quantum dense coding is the protocol to transmit classical information, our analysis provides an alternative operational meaning of the entanglement involved in the on-off photon subtracted state, compared to the previous results, such as teleportation or the nonlocality, that could help to quantify the entanglement of mixed and non-Gaussian states.

Citation Download Citation

Akira Kitagawa, Katsuji Yamamoto, Koji Nagata, Masahiro Takeoka, and Masahide Sasaki "Quantum state engineering with entangled squeezed states and photon number detector", Proc. SPIE 5631, Quantum Optics and Applications in Computing and Communications II, (11 January 2005); https://doi.org/10.1117/12.580852

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