Towards Einstein-Podolsky-Rosen quantum channel multiplexing
arXiv:0710.3086 · doi:10.1103/PhysRevA.81.062301
Abstract
A single broadband squeezed field constitutes a quantum communication resource that is sufficient for the realization of a large number N of quantum channels based on distributed Einstein-Podolsky-Rosen (EPR) entangled states. Each channel can serve as a resource for, e.g. independent quantum key distribution or teleportation protocols. N-fold channel multiplexing can be realized by accessing 2N squeezed modes at different Fourier frequencies. We report on the experimental implementation of the N=1 case through the interference of two squeezed states, extracted from a single broadband squeezed field, and demonstrate all techniques required for multiplexing (N>1). Quantum channel frequency multiplexing can be used to optimize the exploitation of a broadband squeezed field in a quantum information task. For instance, it is useful if the bandwidth of the squeezed field is larger than the bandwidth of the homodyne detectors. This is currently a typical situation in many experiments with squeezed and two-mode squeezed entangled light.
4 pages, 4 figures. In the new version we cite recent experimental work bei Mehmet et al., arxiv0909.5386, in order to clarify the motivation of our work and its possible application
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- Einstein-Podolsky-Rosen paradox and quantum steering in pulsed optomechanics
- Einstein-Podolsky-Rosen entanglement and steering in two-well BEC ground states
- Detecting faked continuous variable entanglement using one-sided device-independent entanglement witnesses
- Demonstration of interferometer enhancement through EPR entanglement
- Entanglement and squeezing of continuous-wave stationary light
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- Measurement of the squeezed vacuum state by a bichromatic local oscillator
- Towards an Einstein-Podolsky-Rosen paradox between two macroscopic atomic ensembles at room temperature
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- Quantifying the mesoscopic nature of the Einstein-Podolsky-Rosen nonlocality
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- Resource reduction for simultaneous generation of two types of continuous variable nonclassical states