Reconfigurable Josephson Phase Shifter.

Taras Golod,Olena M Kapran,Vyacheslav V Dremov,Razmik A Hovhannisyan,Vasily S Stolyarov,Vladimir M Krasnov

doi:10.1021/acs.nanolett.1c01366

Taras Golod, Olena M Kapran + Show 4 more

Open Access

https://doi.org/10.1021/acs.nanolett.1c01366

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Abstract

Phase shifter is one of the key elements of quantum electronics. In order to facilitate operation and avoid decoherence, it has to be reconfigurable, persistent, and nondissipative. In this work, we demonstrate prototypes of such devices in which a Josephson phase shift is generated by coreless superconducting vortices. The smallness of the vortex allows a broad-range tunability by nanoscale manipulation of vortices in a micron-size array of vortex traps. We show that a phase shift in a device containing just a few vortex traps can be reconfigured between a large number of quantized states in a broad [−3π, +3π] range.

Highlights

Electronic devices operate with certain electronic degrees of freedom: conventional electronics with the charge, spintronics with the spin, and quantum electronics with the phase of the electron wave functions
A phase shifter is an important element of quantum devices such as qubits.[1−12] It can be used in complementary digital electronics,[13−16] cryogenic memory,[17−22] and phase batteries.[23,24]
It is seen that a single vortex can produce any phase shift in the full range [0, 2π]. We utilize this phenomenon for creation of a reconfigurable Josephson phase shifter

Summary

■ INTRODUCTION

Electronic devices operate with certain electronic degrees of freedom: conventional electronics with the charge, spintronics with the spin, and quantum electronics with the phase of the electron wave functions. Similar phase shifters have been used for digital RSFQ electronics.[14,15] Recently it was shown that an Abrikosov vortex can induce a JPS in nearby JJs in the full [−2π, + 2π] range.[23,43,44] Since vortices can be manipulated (displaced, introduced, or removed) by Received: April 6, 2021 Revised: June 8, 2021 Published: June 11, 2021. The small vortex size facilitates broad-range tunability of JPS by nanoscale displacement of vortices. We demonstrate that a great number of multivortex states can be achieved in a device with only few traps This leads to controllable and almost continuous reconfigurability of a vortex-based phase shifter in a broad [−3π, +3π] range

■ RESULTS AND DISCUSSION

■ ACKNOWLEDGMENTS

■ REFERENCES