Enhancement of coherence in qubits due to interaction with environment

Abstract

The influence of the initial preparation on dephasing in open quantum dynamics is studied using an exactly solvable model of a two-level system (qubit) interacting with a bosonic bath. It is found that for some classes of non-selective preparation measurements, qubit-bath correlations lead to a significant enhancement of coherence in the qubit at the initial stage of evolution. The time behavior of the qubit purity and entropy in the regime of enhancement of coherence is considered for different temperatures and coupling strengths.

References in corpus (12)

• Atom Interferometers
• Resolving photon number states in a superconducting circuit
• Maintaining coherence in Quantum Computers
• Room temperature quantum bit storage exceeding 39 minutes using ionized donors in 28-silicon
• Initial correlations in open system's dynamics: The Jaynes-Cummings model
• Decoherence and Initial Correlations in Quantum Brownian Motion
• Decoherence in an exactly solvable qubit model with initial qubit-environment correlations
• Purity and State Fidelity of Quantum Channels via Hamiltonians
• Amplification and suppression of system-bath correlation effects in an open many-body system
• Role of initial system-environment correlations: A master equation approach
• Bath dynamics in an exactly solvable qubit model with initial qubit-environment correlations
• Entropy production in open quantum systems: exactly solvable qubit models

Cited by in corpus (5)

• Peculiarities of qubit initial-state preparation by nonselective measurements on an overcomplete basis
• Bath energy for correlated initial states versus information flow in local dephasing channels
• Protecting coherence in the non-Hermitian two-level system
• Damped oscillations of the energy of a bosonic bath due to spectral gaps and special initial correlations
• Ising model in the Rényi statistics: the finite size effects