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Physics Letters A

Squeezed vacuum in the detection of macroscopically distinguishable quantum states

Antonio Mecozzi, P. Tombesi

Published Apr 1, 1987• 14 citations
Publisher
DOI
10.1016/0375-9601(87)90399-9

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In a strongly pumped nondegenerate traveling-wave optical parametric amplifier, we produce a two-color squeezed vacuum with up to millions of photons per pulse. Our approach to registering this macroscopic quantum state is direct detection of a large number of transverse and longitudinal modes, which is achieved by making the detection time and area much larger than the coherence time and area, respectively. Using this approach, we obtain a record value of twin-beam squeezing for direct detection of bright squeezed vacuum. This makes direct detection of macroscopic squeezed vacuum a practical tool for quantum information applications.