Search results for "Flux qubit"

showing 2 items of 22 documents

Measurement and dephasing of a flux qubit due to heat currents

2013

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.

SuperconductivityJosephson effectPhysicsFlux qubitQuantum PhysicsHeat currentCondensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsDephasingGeneral Physics and AstronomyFOS: Physical sciencesQuantum PhysicsSettore FIS/03 - Fisica Della MateriaTemperature gradientComputer Science::Emerging TechnologiesSUPERCONDUCTIVITY QUBIT THERMAL CURRENT THERMAL DEPHASINGQubitCondensed Matter::SuperconductivityMesoscale and Nanoscale Physics (cond-mat.mes-hall)Quantum Physics (quant-ph)Coherence (physics)
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Superconductor-Diamond Hybrid Quantum System

2016

This chapter describes recent progress on research into superconducting flux qubit, NV diamond, and superconductor-diamond hybrid quantum systems. First, we describe important physical properties of superconducting macroscopic artificial atoms i.e., the tunability of the qubit energy level spacing, the coherence property, an example of strong coupling to another quantum system such as an LC harmonic oscillator, and qubit state readout through a Josephson bifurcation amplifier. We then introduce the NV center in diamond as an intriguing candidate for quantum information processing, which offers excellent multiple accessibility via visible light, microwaves and magnetic fields. Finally, we de…

SuperconductivityPhysicsFlux qubitbusiness.industryDiamond02 engineering and technologyengineering.material021001 nanoscience & nanotechnology01 natural sciencesDark stateCondensed Matter::SuperconductivityQubit0103 physical sciencesQuantum systemengineeringOptoelectronics010306 general physics0210 nano-technologybusinessQuantumCoherence (physics)
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