How squeezed states both maximize and minimize the same notion of quantumness
| Autor: | Khabat Heshami, Aaron Z. Goldberg |
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| Rok vydání: | 2021 |
| Předmět: |
FOS: Physical sciences
Quantum entanglement quantum entanglement 01 natural sciences 010305 fluids & plasmas law.invention law 0103 physical sciences Statistical physics optical interferometry 010306 general physics Eigenvalues and eigenvectors Physics Quantum Physics Regular polygon Creation and annihilation operators squeezing of quantum noise entanglement production Coherent states Quantum Physics (quant-ph) Beam splitter Physics - Optics quantum correlations in quantum information Resolution (algebra) Optics (physics.optics) |
| DOI: | 10.48550/arxiv.2106.03862 |
| Popis: | Beam splitters are routinely used for generating entanglement between modes in the optical and microwave domains, requiring input states that are not convex combinations of coherent states. This leads to the ability to generate entanglement at a beam splitter as a notion of quantumness. A similar, yet distinct, notion of quantumness is the amount of entanglement generated by two-mode squeezers (i.e., four-wave mixers). We show that squeezed-vacuum states, paradoxically, both minimize and maximize these notions of quantumness, with the crucial resolution of the paradox hinging upon the relative phases between the input states and the devices. Our notion of quantumness is intrinsically related to eigenvalue equations involving creation and annihilation operators, governed by a set of inequalities that leads to generalized cat and squeezed-vacuum states. Comment: 12 pages including 2 figures and 1 appendix. Comments welcome! |
| Databáze: | OpenAIRE |
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