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Correcting noise in optical fibers via dynamic decoupling

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Correcting noise in optical fibers via dynamic decoupling
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48
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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 immediately 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 some communication channel. 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. The sequence, implemented with waveplates along the birefringent fiber, helps to maintain very high fidelity over a given length of the fiber. Moreover, errors arising due to the time-dependent control pulses can be completely eliminated as here one only needs to incorporate the wave plates in the prescribed way. This simple and fairly practical model is valid for preserving any general polarization state of the single photons besides providing a direction towards achieving scalable and useful quantum computation with photonic qubits.