Dissipation and decoherence induced by collective dephasing in coupled-qubit system with a common bath

Abstract

The longitudinal coupling of a system to the bath usually induces the pure dephasing of the system. In this paper, we study the collective dephasing induced dissipation and decoherence in a coupled-qubit system with a common bath. It is shown that, compared with the case of the same system with independent baths, the interference between the dephasing processes of different qubits induced by the common bath significantly changes the dissipation of the system. For the system of two coupled qubits, the interference leads to a faster decoherence in the non-single-excitation subspaces and a slower dissipation (and decoherence) in the single-excitation subspace. For the system of multiple coupled qubits, we also find the slower dissipation in the single-excitation subspace and obtain the decay rates of the first excited states for different system sizes numerically. All our results on collective dephasing induced dissipation can be explained based on a simple model with Fermi's golden rule.

arXiv comment7 pages, 6 figures. Comments are welcomed

References in corpus (22)

• Quantum state engineering with Josephson-junction devices
• Decoherence Free Subspaces for Quantum Computation
• Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems
• Atomic physics and quantum optics using superconducting circuits
• Noiseless Quantum Codes
• Environment-Assisted Quantum Walks in Photosynthetic Energy Transfer
• Dephasing assisted transport: Quantum networks and biomolecules
• Preserving coherence in quantum computation by pairing quantum bits
• Theory of Decoherence-Free Fault-Tolerant Universal Quantum Computation
• Dynamics of the entanglement between two oscillators in the same environment
• Sudden death and sudden birth of entanglement in common structured reservoirs
• Dephasing of a superconducting flux qubit
• Dephasing of solid-state qubits at optimal points
• Single-qubit lasing and cooling at the Rabi frequency
• Entangling two unequal atoms through a common bath
• Entanglement between charge qubits induced by a common dissipative environment
• Correlation-induced suppression of decoherence in capacitively coupled Cooper-pair boxes
• Pure dephasing in flux qubits due to flux noise with spectral density scaling as $1/f^{\alpha }$
• Circuit QED and sudden phase switching in a superconducting qubit array
• Master equation for dissipative interacting qubits in a common environment
• Effects of low-frequency noise cross-correlations in coupled superconducting qubits
• The quasi-dark state and quantum interference in Jaynes-Cummings model with a common bath

Cited by in corpus (9)

• Control relaxation via dephasing: an exact quantum state diffusion study
• Thermal noise cancellation for optomechanically induced nonreciprocity in a whispering-gallery-mode microresonator
• Quantum metrology with one auxiliary particle in a correlated bath and its quantum simulation
• Decoherence-free quantum register of nuclear spins in diamond
• Robustness of energy landscape control for spin networks under decoherence
• Dissipative stabilization of maximal entanglement between non-identical emitters via two-photon excitation
• Frequency-resolved Purcell effect for the dissipative generation of steady-state entanglement
• Non-Markovian dynamics of a two-level system in a bosonic bath and a Gaussian fluctuating environment with finite correlation time
• Non-Markovian decoherence of a two-level system in a Lorentzian bosonic reservoir and a stochastic environment with finite correlation time