Dispersive Coupling Between the Superconducting Transmission Line Resonator and the Double Quantum Dots

TL;DR

This paper explores using a superconducting transmission line resonator as a tunable dispersive coupler for double quantum dot qubits, enabling scalable quantum computing with current technology.

Contribution

It introduces a general interaction Hamiltonian for multiple double-dot qubits coupled via a superconducting resonator, highlighting a method for scalable quantum operations.

Findings

Major quantum operations can be reliably implemented.

Decoherence sources are manageable with current technology.

The approach enables controllable interactions between distant qubits.

Abstract

Realization of controllable interaction between distant qubits is one of the major problems in scalable solid state quantum computing. We study a superconducting transmission line resonator (TLR) as a tunable dispersive coupler for the double-dot molecules. A general interaction Hamiltonian of $n$ two-electron spin-based qubits and the TLR is presented, where the double-dot qubits are biased at the large detuning region and the TLR is always empty and virtually excited. Our analysis o the main decoherence sources indicates that various major quantum operations can be reliably implemented with current technology.