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International conference on fiber optics and photonics

Effectiveness of Concatenated Dynamical Decoupling for Polarization Decoherence in Optical Qubits

Sajeev Damodarakurup, Jijo Pulickiyil Ulahannan, Ram Soorat

Published Jan 1, 2016• 0 citations
Publisher

Abstract

The effectiveness of concatenated dynamical decoupling scheme to combat polarization decoherence in optical qubits is examined. The scheme is found effective in preserving the purity of optical qubits in a decohering birefringent environment.
DOI
10.1364/photonics.2016.w3a.18

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In quantum information processing, it is vital to protect the coherence of qubits in noisy environments. Dynamical decoupling (DD), which applies a sequence of flips on qubits and averages the qubit-environment coupling to zero, is a promising strategy compatible with other desired functionalities, such as quantum gates. Here, we review the recent progresses in theories of dynamical decoupling and experimental demonstrations. We give both semiclassical and quantum descriptions of the qubit decoherence due to coupling to noisy environments. Based on the quantum picture, a geometrical interpretation of DD is presented. The periodic Carr-Purcell-Meiboom-Gill DD and the concatenated DD are reviewed, followed by a detailed exploration of the recently developed Uhrig DD, which employs the least number of pulses in an unequally spaced sequence to suppress the qubit-environment coupling to a given order of the evolution time. Some new developments and perspectives are also discussed.