Characterization of coherent impurity effects in solid-state qubits

2007/06/30 by E. Paladino, Elisabetta Paladino, Maura Sassetti +3 · 1 citation
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum and electron transport phenomena #Spectroscopy and Quantum Chemical Studies #cond-mat.mes-hall #cond-mat.stat-mech

paper · pdf · doi:10.1103/physrevb.77.041303

published as Phys. Rev. B 77, 041303(R), 2008 · 4 pages, 5 figures. Replaced with published version, minor changes

openalex publication_date 2008/01/14 · arxiv created 2008/01/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We propose a characterization of the effects of bistable coherent impurities in solid-state qubits. We introduce an effective impurity description in terms of a tunable spin-boson environment and solve the dynamics for the qubit coherences. The dominant rate characterizing the asymptotic time limit is identified, and signatures of non-Gaussian behavior of the quantum impurity at intermediate times are pointed out. An alternative perspective considering the qubit as a measurement device for the spin-boson impurity is proposed.

Citations

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Coherent Quantum Dynamics of a Superconducting Flux Qubit
• Low-frequency noise in Josephson junctions for superconducting qubits
• Low- and High-Frequency Noise from Coherent Two-Level Systems
• Ohmic and Step Noise from a Single Trapping Center Hybridized with a Fermi Sea

Cited by

• Dissipation and entanglement dynamics for two interacting qubits coupled to independent reservoirs