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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Entanglement distillation by dissipation and continuous quantum repeaters.

Karl Gerd H Vollbrecht¹, Christine A Muschik, J Ignacio Cirac

¹Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse, D-85748 Garching, Germany.

Physical Review Letters

|October 27, 2011

Summary

Dissipative processes can create quantum entanglement, even with environmental noise. This study demonstrates a method for dissipative entanglement distillation, achieving highly entangled states and improving performance with added noise for quantum repeaters.

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Area of Science:

Quantum Information Science
Quantum Optics
Condensed Matter Physics

Background:

Entanglement is fragile and susceptible to environmental interactions.
Dissipative processes can generate entanglement, but noise limits its quality.
Existing methods struggle to achieve high-fidelity entanglement in noisy environments.

Purpose of the Study:

To demonstrate dissipative entanglement distillation.
To achieve a highly entangled steady state using purely dissipative methods.
To explore the role of noise in dissipative entanglement distillation.

Main Methods:

Development of theoretical schemes for dissipative entanglement distillation.
Analysis of system performance under varying noise conditions.
Integration of dissipative distillation into a continuous quantum repeater architecture.

Main Results:

A method for achieving highly entangled steady states via dissipative distillation is presented.
Counterintuitive results show improved performance with added noise.
The proposed schemes are scalable for quantum repeaters, with resources growing polynomially with distance.

Conclusions:

Dissipative entanglement distillation is a viable method for generating high-quality entanglement.
Noise can be beneficial in specific dissipative quantum information processing tasks.
This work offers a promising approach for building scalable quantum communication networks.