Increasing and decreasing entanglement characteristics for continuous variables by a local photon subtraction

Abstract

We investigate how the entanglement characteristics of a non-Gaussian entangled state are increased or decreased by a local photon subtraction operation. The non-Gaussian entangled state is generated by injecting a single-mode non-Gaussian state and a vacuum state into a 50:50 beam splitter. We consider a photon-added coherent state and an odd coherent state as a single-mode non-Gaussian state. In the regime of small amplitude, we show that the performance of quantum teleportation and the second-order Einstein-Podolsky- Rosen-type correlation can both be enhanced, whereas the degree of entanglement decreases, for the output state when a local photon subtraction operation is applied to the non-Gaussian entangled state. The counterintuitive effect is more prominent in the limit of nearly zero amplitude.

Published version, 7 pages, 3 figures

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Cited by in corpus (10)

• Continuous-variable quantum teleportation with non-Gaussian entangled states generated via multiple-photon subtraction and addition
• Precision measurements with photon-subtracted or photon-added Gaussian states
• Enhancing quantum entanglement and quantum teleportation for two-mode squeezed vacuum state by local quantum-optical catalysis
• Quantum phase estimation using a multi-headed cat state
• Optimal fidelity of teleportation with continuous-variable using three-tunable parameters in realistic environment
• Quantifying non-Gaussianity of quantum-state correlation
• Quantifying non-Gaussianity of a quantum state by the negative entropy of quadrature distributions
• Nonclassical properties of Hermite polynomial's excitation on squeezed vacuum and its decoherence in phase-sensitive reservoirs
• Quantum Teleportation with a Class of Non-Gaussian Entangled Resources
• Improving entanglement of even entangled coherent states by a coherent superposition of photon subtraction and addition