Weak Values and Continuous-Variable Entanglement Concentration

Abstract

We demonstrate a general weak measurement model which allows Gaussian preserving entanglement concentration of the two mode squeezed vacuum. The power of this simple and elegant protocol is through the constraints it places on possible ancilla states and measurement strategies that will allow entanglement concentration. In particular, it is shown how previously discovered protocols of this kind emerge as special examples of the general model described here. Finally, as evidence of its utility, we use it to provide another novel example of such a protocol.

4 pages, 1 figure, Final version to appear in Phys. Rev. A

References in corpus (9)

• Concentrating Partial Entanglement by Local Operations
• Quantum weak values
• Driving non-Gaussian to Gaussian states with linear optics
• Distillation of continuous-variable entanglement with optical means
• Weak Measurements with Arbitrary Pointer States
• Entanglement concentration of continuous variable quantum states
• Relativity of pure states entanglement
• Realization of quantum mechanical weak values of observables using entangled photons
• Procrustean entanglement concentration of continuous variable states of light

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• Quantum state engineering, purification, and number resolved photon detection with high finesse optical cavities
• Weak Measurements with Entangled Probes
• Entanglement Concentration for two atomic ensembles using an effective atom-light beamsplitter