Generating Robust Entanglement via Quantum Feedback

Abstract

Generating entangled states is one of the most important tasks in quantum information technology. However, in reality any entanglement generator must contain some characteristic uncertainty, and as a result the produced entangled state becomes an undesirable mixed state. This paper develops a coherent feedback control scheme that suppresses the characteristic uncertainty of a typical entanglement generator (non-degenerate optical parametric oscillator) for producing robust Gaussian entangled states. In particular, we examine a two-mode squeezed state and Gaussian four-mode cluster states to demonstrate the effectiveness of the proposed control method.

8 pages, 11 figures

References in corpus (5)

• One-Way Quantum Computing in the Optical Frequency Comb
• Symplectic invariants, entropic measures and correlations of Gaussian states
• Building Gaussian Cluster States by Linear Optics
• Ultracompact Generation of Continuous-Variable Cluster States
• Coherent versus measurement feedback: Linear systems theory for quantum information

Cited by in corpus (2)

• Comparison between continuous- and discrete-mode coherent feedback for the Jaynes-Cummings model
• Feasibility study of a coherent feedback squeezer