Controlling dephasing of coupled qubits via shared-bath coherence
arXiv:2405.14685 · doi:10.1103/ltk8-fpv3
Abstract
The interaction of a quantum system with its environment limits its coherence time. This, in particular, restricts the utility of qubits in quantum information processing applications. In this paper, we show that the decoherence of a coupled qubit system can be minimized, or even eliminated, by exploiting the quantum coherence of the bath itself. We investigate the dephasing in a system of two spatially separated, electronically decoupled qubits, with direct or mediated coupling, interacting with a shared bath. For illustration, we treat Förster or cavity-mediated coupling between semiconductor quantum dots interacting with acoustic phonons. Using the rigorous method of Trotter's decomposition with cumulant expansion, we demonstrate a reduction in the dephasing rates at specific distances between the dots. The control of dephasing with distance is a coherent effect of the shared bath and is absent for independent baths. It can be understood in terms of phonon-assisted transitions between the entangled qubit states of the coupled system.
17 pages, 11 figures
References in corpus (27)
- Coupling Superconducting Qubits via a Cavity Bus
- Quantum Decoherence
- Tunable Indistinguishable Photons From Remote Quantum Dots
- Interference of Single Photons from Two Separate Semiconductor Quantum Dots
- Dephasing in Quantum Dots: Quadratic Coupling to Acoustic Phonons
- Quantum Dot Cavity-QED in the Presence of Strong Electron-Phonon Interactions
- Quantum Interference of Identical Photons from Remote GaAs Quantum Dots
- Quantum coherent biomolecular energy transfer with spatially correlated fluctuations
- Phonon-assisted two-photon interference from remote quantum emitters
- Reducing phonon-induced decoherence in solid-state single-photon sources with cavity quantum electrodynamics
- Photon mediated interaction between distant quantum dot circuits
- Proposed robust and high-fidelity preparation of excitons and biexcitons in semiconductor quantum dots making active use of phonons
- Microwave photon-mediated interactions between semiconductor qubits
- Cavity-Enhanced Two-Photon Interference using Remote Quantum Dot Sources
- Phonon-induced Exciton Dephasing in Quantum Dot Molecules
- Spin-Forster transfer in optically excited quantum dots
- Microcavity controlled coupling of excitonic qubits
- Phonon-induced electron relaxation in weakly-confined single and coupled quantum dots
- Change of decoherence scenario and appearance of localization due to reservoir anharmonicity
- Phonon impact on optical control schemes of quantum dots: The role of quantum dot geometry and symmetry
- Zero-phonon linewidth and phonon satellites in the optical absorption of nanowire-based quantum dots
- Exploiting one-dimensional exciton-phonon coupling for tunable and efficient single-photon generation with a carbon nanotube
- Exact Quantum Dynamics in Structured Environments
- Phonon-Induced Dephasing in Quantum Dot-Cavity QED
- Strong reduction of exciton-phonon coupling in high crystalline quality single-wall carbon nanotubes: a new insight into broadening mechanisms and exciton localization
- Impact of the phonon environment on the nonlinear quantum-dot-cavity QED. I. Path-integral approach
- Spectral broadening of optical transitions at tunneling resonances in InAs/GaAs coupled quantum dot pairs