Continuous-variables entanglement purification with atomic systems

Abstract

We present a proposal for entanglement purification of the continuous-variable quantum state of two propagating optical fields. The scheme is based on letting each field interact with a local node, an atomic ensemble, whose internal collective excitation plays the role of an ancillary continuous variable resource. Entanglement purification is achieved by a dichotomic measurement, representing the required non-Gaussian element, and which consists in detecting the presence or absence of collective excitations in the atomic ensemble. This scheme can be extended to networks, where the nodes are single trapped atoms, and constitutes an important building block for the implementation of a continuous-variable quantum repeater.

Published in Feature Issue "Quantum Optical Information Technologies"

References in corpus (6)

• Mapping photonic entanglement into and out of a quantum memory
• Quantum Memories. A Review based on the European Integrated Project "Qubit Applications (QAP)"
• Non-Gaussian entanglement distillation for continuous variables
• Continuous variable tangle, monogamy inequality, and entanglement sharing in Gaussian states of continuous variable systems
• Quantum Teleportation with Continuous Variables: a survey
• Time-separated entangled light pulses from a single-atom emitter

Cited by in corpus (4)

• Distillation of mixed-state continuous-variable entanglement by photon subtraction
• More nonlocality with less entanglement in a tripartite atom-optomechanical system
• Genuine Multipartite Entanglement induced by a Thermal Acoustic Reservoir
• Stationary entanglement of photons and atoms in a high-finesse resonator