Realization of a Decoherence-free, Optimally Distinguishable Mesoscopic Quantum Superposition

Details Realization of a Decoherence-free, Optimally Distinguishable Mesoscopic Quantum Superposition Realization of a Decoherence-free, Optimally Distinguishable Mesoscopic Quantum Superposition

2005-08-26

arxiv.org/abs/quant-ph/0508196v2

Phys. Rev. Lett. 95, 240401 (2005)

Physics

Quantum Physics

10 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.95.240401

We report the realization of an entangled quantum superposition of M=12 photons by a high gain, quantum-injected optical parametric amplification. The system is found so highly resilient against decoherence to exhibit directly accessible mesoscopic interference effects at normal temperature. By modern tomographic methods the non-separability and the quantum superposition are demonstrated for the overall mesoscopic output state of the dynamic ''closed system''. The device realizes the condition conceived by Erwin Schroedinger with his 1935 paradigmatic ''Cat'' apologue, a fundamental landmark in quantum mechanics.

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