Displacement-enhanced continuous-variable entanglement concentration

Abstract

We study entanglement concentration of continuous variable Gaussian states by local photon subtractions enhanced by coherent displacements. Instead of the previously considered symmetric two-mode squeezed vacuum states, we investigate the protocol for input states in the form of split single-mode squeezed vacuum, i.e., states obtained by mixing a single-mode squeezed vacuum with a vacuum state on a beam splitter, which is an experimentally highly relevant configuration. We analyze two scenarios in which the displacement-enhanced photon subtraction is performed either only on one, or on both of the modes and show that local displacements can lead to improved performance of the concentration protocol.

References in corpus (28)

• Quantum entanglement
• A computable measure of entanglement
• Quantum information with continuous variables
• Gaussian Quantum Information
• Concentrating Partial Entanglement by Local Operations
• Purification of Noisy Entanglement and Faithful Teleportation via Noisy Channels
• Quantum key distribution using gaussian-modulated coherent states
• Quantum privacy amplification and the security of quantum cryptography over noisy channels
• Continuous variable quantum cryptography
• Generation of a superposition of odd photon number states for quantum information networks
• On the impossibility of distilling Gaussian states with Gaussian operations
• The characterization of Gaussian operations and Distillation of Gaussian States
• Continuous-variable teleportation improvement by photon subtraction via conditional measurement
• Gaussian transformations and distillation of entangled Gaussian states
• Non-Gaussian entanglement distillation for continuous variables
• Controllable generation of highly nonclassical states from nearly pure squeezed vacua
• Teleportation improvement by inconclusive photon subtraction
• Entanglement purification of Gaussian continuous variable quantum states
• Driving non-Gaussian to Gaussian states with linear optics
• Enhancing quantum entanglement by photon addition and subtraction
• Quantum key distribution with bright entangled beams
• Engineering quantum operations on traveling light beams by multiple photon addition and subtraction
• Optical continuous-variable qubit
• Distillation of continuous-variable entanglement with optical means
• A compact entanglement distillery
• Entanglement concentration of continuous variable quantum states
• Local Gaussian operations can enhance continuous-variable entanglement distillation
• Improving entanglement concentration of Gaussian states by local displacements

Cited by in corpus (4)

• Resource theory of quantum non-Gaussianity and Wigner negativity
• Displacement-enhanced entanglement distillation of single-mode-squeezed entangled states
• Entangling remote microwave quantum computers with hybrid entanglement swap and variational distillation
• Two-mode light states before and after delocalized single-photon addition