Modeling Three and Four Coupled Phase Qubits

TL;DR

This paper investigates the quantum properties of three and four capacitively-coupled Josephson phase qubits, analyzing energy levels and eigenstates to understand their potential for quantum computation.

Contribution

It introduces a detailed analysis of multi-qubit coupled systems using a two-level model, extending understanding beyond two-qubit configurations.

Findings

Energy levels depend on bias current and detuning.

Eigenstates are characterized for different configurations.

Properties of multi-qubit networks are discussed.

Abstract

The Josephson junction phase qubit has been shown to be a viable candidate for quantum computation. In recent years, the two coupled phase system has been extensively studied theoretically and experimentally. We have analyzed the quantum behavior of three and four capacitively-coupled phase qubits with different possible configurations, using a two-level system model. Energy levels and eigenstates have been calculated as a function of bias current and detuning. The properties of these simple networks are discussed.