RSFQ devices with selective dissipation for quantum information processing

TL;DR

This paper explores using frequency-dependent damping in RSFQ circuits with RC shunts to reduce dissipation and decoherence, enabling stable operation and improved qubit manipulation.

Contribution

It introduces a novel RC shunt approach for RSFQ devices, providing stability criteria and analyzing decoherence reduction for quantum information processing.

Findings

Stable RSFQ operation with RC shunting demonstrated

Reduced decoherence in RSFQ/qubit circuits shown

Design of a flux generator for qubit manipulation

Abstract

We study the possibility to use frequency dependent damping in RSFQ circuits as means to reduce dissipation and consequent decoherence in RSFQ/qubit circuits. We show that stable RSFQ operation can be achieved by shunting the Josephson junctions with an $RC$ circuit instead of a plain resistor. We derive criteria for the stability of such an arrangement, and discuss the effect on decoherence and the optimisation issues. We also design a simple flux generator aimed at manipulating flux qubits.