Quantum computation with Josephson-qubits by using a current-biased information bus

TL;DR

This paper presents a scheme for quantum computation using superconducting Josephson qubits coupled via a current-biased Josephson junction acting as an adjustable quantum bus, enabling indirect qubit interactions.

Contribution

It introduces a sequential coupling method to manipulate quantum information in superconducting circuits, differing from previous simultaneous coupling approaches.

Findings

Quantum gates can be realized with tunable couplings.

Decoherence properties are analyzed using Bloch-Redfield formalism.

Numerical estimates support experimental feasibility.

Abstract

We propose an effective scheme for manipulating quantum information stored in a superconducting nanocircuit. The Josephson qubits are coupled via their separate interactions with an information bus, a large current-biased Josephson junction treated as an oscillator with adjustable frequency. The bus is sequentially coupled to only one qubit at a time. Distant Josephson qubits without any direct interaction can be indirectly coupled with each other by independently interacting with the bus sequentially, via exciting/de-exciting vibrational quanta in the bus. This is a superconducting analog of the successful ion trap experiments on quantum computing. Our approach differs from previous schemes that simultaneously coupled two qubits to the bus, as opposed to their sequential coupling considered here. The significant quantum logic gates can be realized by using these tunable and selective couplings. The decoherence properties of the proposed quantum system are analyzed within the Bloch-Redfield formalism. Numerical estimations of certain important experimental parameters are provided.