Energy dissipation minimization in Superconducting circuits

Narayana, Supradeep; Семенов, В.К.

doi:10.5772/16285

Cited by 1 publication

(1 citation statement)

References 18 publications

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“…Assuming that a QET is used for a gate operation per 20 ns and about 20 SFQ pulses are required for each gate operation, the average switching frequency of Josephson junctions in the QET, f s , is about 1 GHz. With the critical current I C = 160 μA and a flux quantum Φ 0 ≈ 2.06783385 × 10 −15 Wb, the dynamic power dissipation P D of a QET can be estimated to be 0.33 nW according to the following formula [18]:…”

Section: Structure Of the Qubit Energy Tunermentioning

confidence: 99%

Qubit energy tuner based on single flux quantum circuits

Geng,

He,

Huang

et al. 2023

Front. Phys.

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A device called the qubit energy tuner (QET), based on single flux quantum (SFQ) circuits, has been proposed for Z control of superconducting qubits. The QET is created by improving flux digital-to-analog converters (flux DACs). It can set the energy levels or frequencies of qubits, particularly flux-tunable transmons, and perform gate operations requiring Z control. The circuit structure of the QET is elucidated, consisting of an inductor loop and flux bias units for coarse or fine-tuning. The key feature of the QET is analyzed to understand how SFQ pulses change the inductor loop current, which provides external flux for qubits. Three simulations were performed to verify QET functionality. The first simulation verified the responses of the inductor loop current to SFQ pulses, showing a relative deviation of approximately 4.259% between the analytical solutions of the inductor loop current and the solutions from the WRSpice time-domain simulation. The second and third simulations, using QuTip, demonstrated how to perform a Z gate and an iSWAP gate using the QET, respectively, with corresponding fidelities of 99.99884% and 99.93906% for only one gate operation to specific initial states. These simulations indicate that the SFQ-based QET could act as an efficient component of SFQ-based quantum–classical interfaces for digital Z control of large-scale superconducting quantum computers.

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Section: Structure Of the Qubit Energy Tunermentioning

confidence: 99%