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Title: Engineered decoherence: Characterization and suppression
Authors: Hegde, Swathi S.
Dept. of Physics
Keywords: Engineered decoherence
Characterization and suppression
Resonance quantum register
Theoretical simulations
Issue Date: Jun-2014
Publisher: American Physical Society
Citation: Physical Review A, 89(6), 062317.
Abstract: Due to omnipresent environmental interferences, quantum coherences inevitably undergo irreversible transformations over certain time scales, thus leading to the loss of encoded information. This process, known as decoherence, has been a major obstacle in realizing efficient quantum information processors. Understanding the mechanism of decoherence is crucial in developing tools to inhibit it. Here we utilize a method proposed by Teklemariam et al. [Phys. Rev. A 67, 062316 (2003)] to engineer artificial decoherence in the system qubits by randomly perturbing their surrounding ancilla qubits. Using a two-qubit nuclear magnetic resonance quantum register, we characterize the artificial decoherence by noise spectroscopy and quantum process tomography. Further, we study the efficacy of dynamical decoupling sequences in suppressing the artificial decoherence. Here we describe the experimental results and their comparisons with theoretical simulations.
ISSN: 1050-2947
Appears in Collections:JOURNAL ARTICLES

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