Dynamical Decoupling in Optical Fibers: Preserving Polarization Qubits from Birefringent Dephasing

TL;DR

This paper introduces a dynamical decoupling method using wave plates in optical fibers to protect polarization qubits from birefringent dephasing, enhancing quantum communication fidelity.

Contribution

It proposes a novel integration of wave plates into optical fibers for dynamical decoupling, demonstrating improved preservation of photonic qubit coherence against birefringent noise.

Findings

Effective preservation of polarization qubits over realistic fiber lengths.

High-fidelity coherence maintenance with CPMG dynamical decoupling.

Simulation results show significant noise mitigation in birefringent fibers.

Abstract

One of the major challenges in quantum computation has been to preserve the coherence of a quantum system against dephasing effects of the environment. The information stored in photon polarization, for example, is quickly lost due to such dephasing, and it is crucial to preserve the input states when one tries to transmit quantum information encoded in the photons through a communication channel. We propose a dynamical decoupling sequence to protect photonic qubits from dephasing by integrating wave plates into optical fiber at prescribed locations. We simulate random birefringent noise along realistic lengths of optical fiber and study preservation of polarization qubits through such fibers enhanced with Carr-Purcell-Meiboom-Gill (CPMG) dynamical decoupling. This technique can maintain photonic qubit coherence at high fidelity, making a step towards achieving scalable and useful quantum communication with photonic qubits.