Quantum Landscape of Superconducting Diodes

TL;DR

This paper explores the quantum properties of superconducting diodes and their potential for scalable, integrated quantum circuits, addressing control, scalability, and thermal compatibility challenges.

Contribution

It reveals how superconducting diodes' nonlinear and nonreciprocal features can enable scalable, on-chip quantum electrodynamics with thermal and electrical integration.

Findings

Superconducting diodes enable noise-resilient qubit integration.

Thermodynamic constraints can be harnessed for thermal compatibility.

SDs facilitate on-chip scalable quantum workflows.

Abstract

This study maps the quantum landscape of superconducting diodes (SDs) \cite{nadeem23} onto the quantum technology architecture, which is currently constrained by fundamental challenges in control and scalability. In the existing non-integrated quantum technology hardware, control and scalability related issues emerge at two fronts: First, nonlinear and nonreciprocal circuit elements, which are essential building blocks for quantum processors, are often complex, bulky, and dissipative. Second, the temperature gradient between classical control electronics ($T_C\gtrsim$ K), which is also dissipative, and the quantum processor at cryogenic temperatures ($T_Q\sim$ mK) makes scalability even more challenging. The main focus is to reveal how the built-in nonlinearity, nonreciprocity, and quantum functionalities of SDs are significant for on-chip integrated circuit quantum electrodynamics (c-QED), enabling scalable integration of noise-resilient qubit and qubit-interfaces for efficient power delivery, coherent control and memory, high-fidelity readout, and quantum-limited amplification. To this end, this study will also shed light on how thermodynamic constraints and field effects can be harnessed within a quantum-enhanced SD platform, thereby enabling thermal compatibility between classical and quantum workflows, isothermal all-electrical control, and on-chip scalability. This perspective is expected to play a pivotal role in the advancement of superconducting circuit-based quantum hardware with temperature-matched classical, quantum, and hybrid workflows.