Experimental generation of Schrodinger cats via quantum measurement

P. Tombesi, David Vitali, Philippe Grangier

David Vitali, P. Tombesi, Philippe Grangier

Shigenari Suzuki, Kenji Tsujino, Fumihiko Kannari +1 more

Bernard Yurke, David Stoler

Zheng Shi-Biao

We describe the Greenberger–Horne–Zeilinger (GHZ) paradox in the multi-mode Schrödinger cat states. We also show that the multi-mode cat states violate the Bell's inequality by an amount that grows exponentially with number of modes. The test of quantum nonlocality is based on parity measurement and displacement operation, which are experimentally feasible. We also describe a scheme for the generation of the cat states in cavity QED.

Y. Takahashi, Shuichiro Inoue, Shinichi Komatsu

Measurement-induced nonlinear operation in linear optics is a promising technique to realize quantum computation and communications. Such an operation has been demonstrated via the generation of photon-subtracted squeezed states, namely, Schrödinger-cat states. Nielsen and Mølmer have proposed an efficient scheme to generate the cat states with larger amplitudes relative to previous experimental results. We present a simple experimental implementation of their scheme and analyze it while considering experimental imperfections. Our study indicates that the current photon detection technology meets the conditions necessary for their operation.