Reproducibility and Gap Control of Superconducting Flux Qubits

Chang, Tikai; Holzman, Itamar; Cohen, Tamar; Johnson, Brett C.; Jamieson, David N.; Stern, Michael

doi:10.1103/physrevapplied.18.064062

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…By controlling the site energies of the qubits, this system allowed for the emulation of BZOs dynamics. [ 50,51 ] In the circuit, magnetic fluxes were directed outside in qubit

n-1

and inside in qubit n , resulting in alternating site energies in neighboring qubits. The magnetic flux

\Phi _\text{e}(t)

represented an external driving force on the qubit array, forming a biperiodic potential system which can be used to study BZOs phenomena.…”

Section: Methodsmentioning

confidence: 99%

“…In 2022, Chang et al produced a large batch of flux qubits and showed excellent reproducibility and control of the qubit gap, relaxation times, and pure echo dephasing times through careful control of e-beam lithography, oxidation parameters of the junctions, and sample surface. [50] The continuous progress opens up the possibility of time-dependent manipulation of the band gap in a 1D flux qubit chain.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamics of Bloch–Zener Oscillations with Tuning Gap

Huang

Yao

2023

Annalen der Physik

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In this study, the transient dynamics of Bloch-Zener oscillations (BZOs) in a 1D qubit chain with a controllable band gap are explored. The chain consists of alternating site energies and is subjected to a constant external field. Several tight-binding models were analyzed, including Bloch and Landau-Zener models, to understand the BZOs mechanism. The findings revealed that the band gaps played a crucial role in bridging the intriguing interplay between Bloch oscillations and Landau-Zener transitions. The motion of carriers in real and quasi-momentum spaces is explored and the time evolution of occupancy in mini-bands is calculated. A linearly time-dependent way of tuning the gap is also proposed and non-periodic motion is observed. When the chain is coupled to dispersionless optical phonons, strong coupling leads to large phonon displacements and localizes the carrier wave packets of the qubit states. The findings provide new insights into the behavior of BZOs in complex systems and suggest avenues for future studies.

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“…By controlling the site energies of the qubits, this system allowed for the emulation of BZOs dynamics. [ 50,51 ] In the circuit, magnetic fluxes were directed outside in qubit