From Zeno to anti-Zeno: decoherence-control dependence on the quantum statistics of the bath

Abstract

We demonstrate through exact solutions that a spin bath leads to stronger (faster) dephasing of a qubit than a bosonic bath with identical bath-coupling spectrum. This difference is due to the spin-bath "dressing" by the coupling. Consequently, the quantum statistics of the bath strongly affects the pulse sequences required to dynamically decouple the qubit from its bath.

2 figures (submitted)

References in corpus (14)

• The Magnus expansion and some of its applications
• Fault-Tolerant Quantum Dynamical Decoupling
• Thermodynamical Control by Frequent Quantum Measurements
• Optimal Dynamical Decoherence Control of a Qubit
• Universality of Uhrig dynamical decoupling for suppressing qubit pure dephasing and relaxation
• Exact Results on Dynamical Decoupling by $\pi$-Pulses in Quantum Information Processes
• Decoherence in qubits due to low-frequency noise
• Universal pulse sequence to minimize spin dephasing in the central spin decoherence problem
• Universal dynamical decoherence control of noisy single-and multi-qubit systems
• Performance comparison of dynamical decoupling sequences for a qubit in a rapidly fluctuating spin-bath
• Zeno and anti-Zeno polarization control of spin-ensembles by induced dephasing
• Decoherence and dissipation of a quantum harmonic oscillator coupled to two-level systems
• Bang-Bang control of a qubit coupled to a quantum critical spin bath
• Generation of macroscopic quantum-superposition states by linear coupling to a bath