dorsal/arxiv
View SchemaContinuous variable entanglement of phase locked light beams
| Authors | H. H. Adamyan, G. Yu. Kryuchkyan |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0406128 |
| URL | https://arxiv.org/abs/quant-ph/0406128 |
| DOI | 10.1103/PhysRevA.69.053814 |
| Journal | Phys. Rev. A69, 053814 (2004) |
Abstract
We explore in detail the possibility of intracavity generation of continuous-variable (CV) entangled states of light beams under mode phase-locked conditions. We show that such quantum states can be generated in self-phase locked nondegenerate optical parametric oscillator (NOPO) based on a type-II phase-matched down-conversion combined with linear mixer of two orthogonally polarized modes of the subharmonics in a cavity. A quantum theory of this device, recently realized in the experiment, is developed for both sub-threshold and above-threshold operational regimes. We show that the system providing high level phase coherence between two generated modes, unlike to the ordinary NOPO, also exhibits different types of quantum correlations between photon numbers and phases of these modes. We quantify the CV entanglement as two-mode squeezing and show that the maximal degree of the integral two-mode squeezing(that is 50% relative to the level of vacuum fluctuations) is achieved at the pump field intensity close to the generation threshold of self-phase locked NOPO, provided that the constant of linear coupling between the two polarizations is much less than the mode detunings. The peculiarities of CV entanglement for the case of unitary, non-dissipative dynamics of the system under consideration is also cleared up.
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"abstract": "We explore in detail the possibility of intracavity generation of\ncontinuous-variable (CV) entangled states of light beams under mode\nphase-locked conditions. We show that such quantum states can be generated in\nself-phase locked nondegenerate optical parametric oscillator (NOPO) based on a\ntype-II phase-matched down-conversion combined with linear mixer of two\northogonally polarized modes of the subharmonics in a cavity. A quantum theory\nof this device, recently realized in the experiment, is developed for both\nsub-threshold and above-threshold operational regimes. We show that the system\nproviding high level phase coherence between two generated modes, unlike to the\nordinary NOPO, also exhibits different types of quantum correlations between\nphoton numbers and phases of these modes. We quantify the CV entanglement as\ntwo-mode squeezing and show that the maximal degree of the integral two-mode\nsqueezing(that is 50% relative to the level of vacuum fluctuations) is achieved\nat the pump field intensity close to the generation threshold of self-phase\nlocked NOPO, provided that the constant of linear coupling between the two\npolarizations is much less than the mode detunings. The peculiarities of CV\nentanglement for the case of unitary, non-dissipative dynamics of the system\nunder consideration is also cleared up.",
"arxiv_id": "quant-ph/0406128",
"authors": [
"H. H. Adamyan",
"G. Yu. Kryuchkyan"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.69.053814",
"journal_ref": "Phys. Rev. A69, 053814 (2004)",
"title": "Continuous variable entanglement of phase locked light beams",
"url": "https://arxiv.org/abs/quant-ph/0406128"
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