01
Nov
14

Two-mode squeezed state as Schrodinger-cat-like state

See on Scoop.itBounded Rationality and Beyond

In recent years, there has been an increased interest in the generation of superposition of coherent states with opposite phases, the so-called photonic Schr”odinger-cat states. These experiments are very challenging and so far, cats involving small photon numbers only have been implemented. Here, we propose to consider the two-mode squeezed state as an example of a Schr”odinger-cat-like state. In particular, we are interested in various criteria aiming to identify quantum states that are macroscopic superpositions in a more general sense. We show how these criteria can be extended to continuous variable entangled states. We apply them to two-mode squeezed states and argue that they belong to a class of general Schr”odinger-cat states. We provide experimental guidelines to verify their macroscopic quantum nature and to measure their size. Our results not only promote two-mode squeezed states for exploring quantum effects at the macroscopic level but also provide direct measures to evaluate their usefulness for quantum metrology.

See on arxiv.org



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