Preserving Entanglement of Flying Qubits in Optical Fibers by Dynamical Decoupling

TL;DR

This paper theoretically explores how dynamical decoupling sequences can significantly preserve entanglement of flying qubits in optical fibers affected by 1/f noise, enhancing quantum communication robustness.

Contribution

It introduces a method to suppress polarization decoherence in birefringent fibers using dynamical decoupling, improving entanglement preservation in quantum communication.

Findings

Decoherence due to polarization mode dispersion can be greatly reduced.

Entanglement can be effectively maintained with control pulses.

The method is effective even with wide optical fibers.

Abstract

We theoretically investigate the influence of dynamical decoupling sequence in preserving entanglement of polarized photons in polarization-maintaining birefringent fibers(PMF) under a classic Gauss 1/f noise. We study the dynamic evolution of entanglement along the control sequence embedded fibers. Decoherence due to dispersion of polarization mode in PMF can be dramatically depressed, even for a wild optical width. Entanglement degree can be effectively preserved while the control pulse is implemented.