Two-way programmable Josephson voltage driving method and device

Abstract

The invention provides a two-way programmable Josephson voltage driving method and device, and the method comprises the steps: setting a sampling frequency fs, and quantifying a target output voltage waveform of a programmable Josephson junction array into a voltage value sequence; calculating a voltage bias combination corresponding to each voltage value in the voltage value sequence S0, S1... Sn-1; calculating a driving voltage combination of each driving channel of the programmable Josephson junction array driver according to the voltage bias combination; quantizing the driving voltage combination of each driving channel into a binary coding combination; sequentially inputting the binary coding combination into the digital-to-analog converters in the driving channels; synchronously triggering the output driving voltage of each driving channel through a reference clock; and driving the programmable Josephson junction array by the driving voltage output by the digital-to-analog converter. The circuit has the advantages that the reference clock is used as a synchronous trigger signal, and high synchronism of two paths of Josephson junction array driving currents is achieved.

Description

technical field [0001] The invention relates to the technical field of circuit driving, in particular to a dual-channel synchronous programmable Josephson voltage driving method and a device thereof. Background technique [0002] In the programmable Josephson quantum voltage reference device, the Josephson junction array must ensure that the driving currents of each sub-junction array are kept synchronized, so as to generate the DC quantum voltage described by the Josephson effect. The Josephson junction array is generally composed of more than ten to twenty sub-junction arrays in series, and the driving current of each sub-junction array needs to maintain a high degree of synchronization. Since the value of the driving current of each sub-junction array is different, the current There is no method in the prior art that can realize the quantum voltage required by the dual-channel Josephson junction array to simultaneously generate standard voltage and current signals. The du...

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Problems solved by technology

The Josephson junction array is generally composed of more than ten to twenty sub-junction arrays in series, and the driving current of each sub-junction array needs to maintain a high degree of synchronization. Since the value of the driving current of each sub-junction array is different, the current There is no method in the prior art that can realize the quantum voltage required by the dual-channel Josephson junction array to simultaneously generate standard voltage and current signals. The dual-channel Josephson junction array must not only ensure that each sub-junction array inside each junction array The driving current of the two-way Josephson junction array needs to be kept synchronous, and a high degree of synchronization between the two Josephson junction arrays needs to be ensured

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