Environmental Assisted Quantum Information Correction for Continuous Variables
arXiv:0909.3546 · doi:10.1103/PhysRevA.81.012325
Abstract
Quantum information protocols are inevitably affected by decoherence which is associated with the leakage of quantum information into an environment. In this paper we address the possibility of recovering the quantum information from an environmental measurement. We investigate continuous variable quantum information, and we propose a simple environmental measurement that under certain circumstances fully restores the quantum information of the signal state although the state is not reconstructed with unit fidelity. We implement the protocol for which information is encoded into conjugate quadratures of coherent states of light and the noise added under the decoherence process is of Gaussian nature. The correction protocol is tested using both a deterministic as well as a probabilistic strategy. The potential use of the protocol in a continuous variable quantum key distribution scheme as a means to combat excess noise is also investigated.
Submitted to PRA
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- Enhancement of nonclassical properties of two-mode squeezed vacuum state with postselected von Neumann measurement
- Cross talk compensation in multimode continuous-variable entanglement distribution
- Performance optimization of continuous variable quantum teleportation with generalized photon-varying non-Gaussian operations
- Quantum counterfactuality with identical particles
- Nonclassical resource for continuous variable telecloning with non-Gaussian advantage
- Estimation of Wigner distribution of single mode Gaussian states: a comparative study
- Conditional cooling limit for a quantum channel going through an incoherent environment
- Quantum noise eater for a single photonic qubit