Measurement and dephasing of a flux qubit due to heat currents

Abstract

We study a flux qubit, made of a superconducting loop interrupted by three Josephson junctions, which is subject to a temperature gradient. We show that the heat current induced by the temperature gradient, being sensitive to the superconducting phase differences at the junctions, depends significantly on the state of the qubit. We furthermore investigate the impact of the heat current on the coherence properties of the qubit state. We have found that even small temperature gradients can lead to dephasing times of the order of microseconds for the Delft-qubit design.

19 pages, 6 figures, published version

References in corpus (12)

• Millisecond charge-parity fluctuations and induced decoherence in a superconducting qubit
• The Josephson heat interferometer
• Quasiparticle relaxation of superconducting qubits in the presence of flux
• Efficient phase-tunable Josephson thermal rectifier
• Coherent caloritronics in Josephson-based nanocircuits
• Phase Modulated Thermal Conductance of Josephson Weak Links
• Phase-controlled superconducting heat-flux quantum modulator
• Trapping hot quasi-particles in a high-power superconducting electronic cooler
• Heat transport through a Josephson junction
• Manipulation and Generation of Supercurrent in Out-of-Equilibrium Josephson Tunnel Nanojunctions
• Coherent diffraction of thermal currents in Josephson tunnel junctions
• Fully-Balanced Heat Interferometer

Cited by in corpus (13)

• Fundamental aspects of steady-state conversion of heat to work at the nanoscale
• Nanoscale phase-engineering of thermal transport with a Josephson heat modulator
• Negative differential thermal conductance and heat amplification in superconducting hybrid devices
• High efficiency thermal switch based on topological Josephson junctions
• A normal metal tunnel-junction heat diode
• Fingerprint of topological Andreev bound states in phase-dependent heat transport
• Phase-tunable thermal rectification in the topological SQUIPT
• Phase-coherent caloritronics with ordinary and topological Josephson junctions
• Electronic heat current rectification in hybrid superconducting devices
• Heat asymmetries in nanoscale conductors: The role of decoherence and inelasticity
• Phase-coherent heat circulators with normal- or superconducting contacts
• Mesoscopic effects in the heat conductance of superconducting-normal-superconducting and normal-superconducting junctions
• Coherent Manipulation of Thermal Transport by Tunable Electron-Photon and Electron-Phonon Interaction