Control relaxation via dephasing: an exact quantum state diffusion study

Abstract

Dynamical decoupling as a quantum control strategy aims at suppressing quantum decoherence adopting the popular philosophy that the disorder in the unitary evolution of the open quantum system caused by environmental noises should be neutralized by a sequence of ordered or well-designed external operations acting on the system. This work studies the solution of quantum-state-diffusion equations by mixing two channels of environmental noises, i.e., relaxation (dissipation) and dephasing. It is interesting to find in two-level and three-level atomic systems that a non-Markovian relaxation or dissipation process can be suppressed by a Markovian dephasing noise. The discovery results in an anomalous control strategy by coordinating relaxation and dephasing processes. Our approach opens an avenue of noise control strategy with no artificial manipulation over the open quantum systems.

8 pages, 3 figures

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Cited by in corpus (9)

• Demonstration of dynamical control of three-level open systems with a superconducting qutrit
• Magnon-mediated quantum battery under systematic errors
• Optomechanical quadrature squeezing in the non-Markovian regime
• Noise assisted quantum coherence protection in hierarchical environment
• Quantum energy current and quantum coherence of a spin chain in a non-Markovian environment
• Optimizing Quantum Teleportation and Dense Coding via Mixed Noise Under Non-Markovian Approximation
• Non-Markovian dynamics of a two-level system in a bosonic bath and a Gaussian fluctuating environment with finite correlation time
• Quantum speed limits in dephasing dynamics of a qubit system coupled to thermal environments
• Non-Markovian decoherence of a two-level system in a Lorentzian bosonic reservoir and a stochastic environment with finite correlation time