Bang-bang control of a qubit coupled to a quantum critical spin bath

2008/02/29 by Davide Rossini, Paolo Facchi, Rosario Fazio +5 · 2 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph

paper · pdf · doi:10.1103/physreva.77.052112

published as Phys. Rev. A 77, 052112 (2008) · 10 pages, 4 figures, replaced with published version

openalex publication_date 2008/05/15 · arxiv created 2008/05/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We analytically and numerically study the effects of pulsed control on the decoherence of a qubit coupled to a quantum spin bath. When the environment is critical, decoherence is faster and we show that the control is relatively more effective. Two coupling models are investigated, namely, a qubit coupled to a bath via a single link and a spin-star model, yielding results that are similar and consistent.

Citations

• Evaluation of a new broadband decoupling sequence: WALTZ-16
• Non-Markovian dynamics in a spin star system: Exact solution and approximation techniques
• Non-Markovian dynamics of a qubit coupled to an Ising spin bath
• Environment-induced superselection rules
• Decoherence, einselection, and the quantum origins of the classical
• Fault-tolerant quantum computation by anyons

Cited by

• Pulse control of sudden transition for two qubits inXYspin baths and quantum phase transition
• From Zeno to anti-Zeno regime: Decoherence-control dependence on the quantum statistics of the bath