Abstract
Recent experimental claims of an observation of a Schroedinger’s cat state indicate the importance of macroscopic quantal signatures of superposition states. I propose an experiment which would definitely rule out ANY classical explanation. The experiment involves simultaneous measurements performed on two spatially separated macroscopic systems at locations A and B respectively. At each location there are two field modes a_ and a+ and b_ and b+, representing orthogonally polarised modes with a macroscopic number of particles. At each location a measurement is made with a polariser which transmits light polarised at angle θ, represented by mode c+ = â+ cos θ /2 +a_ sin θ /2, and reflects light orthogonally polarised, represented by mode c_ = â+ sin θ /2–â_ cos θ /2. We have similar definitions and for transmitted and reflected beams at B, relating to a measurement of polarisation at angle ϕ. The final stage of the measurement is the detection of the fields c± and d± to determine the total number, N+, of particles in an up, or “+”, direction and the total number of particles, N_, in the down, or “-”, direction . I assign the result of the measurement a value if and otherwise, and similarly I define at B
© 2000 IEEE
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