Quantum computation in decoherence-free subspace with superconducting devices

TL;DR

This paper presents a scheme for quantum computation using superconducting devices in a decoherence-free subspace, employing geometric manipulation and parity measurements to implement universal gates.

Contribution

It introduces a novel approach combining geometric manipulation and measurement-based gates for superconducting qubits in a decoherence-free subspace.

Findings

Universal single-qubit gates achieved via cavity-assisted interaction.

Measurement-based two-qubit CNOT gate using parity measurements.

Projective measurement realized through current measurements on superconducting devices.

Abstract

We propose a scheme to implement quantum computation in decoherence-free subspace with superconducting devices inside a cavity by unconventional geometric manipulation. Universal single-qubit gates in encoded qubit can be achieved with cavity assisted interaction. A measurement-based two-qubit Controlled-Not gate is produced with parity measurements assisted by an auxiliary superconducting device and followed by prescribed single-qubit gates. The measurement of currents on two parallel devices can realize a projective measurement, which is equivalent to the parity measurement on the involved devices.