Complete Bell-state analysis for superconducting-quantum-interference-device qubits with transitionless tracking algorithm

TL;DR

This paper presents a high-fidelity, nondestructive Bell-state analysis protocol for superconducting qubits using transitionless tracking, enhancing quantum communication and computation capabilities.

Contribution

It introduces a novel protocol employing transitionless tracking for complete Bell-state analysis in superconducting qubits, ensuring nondestructive measurement with high success probability.

Findings

High success probability in distinguishing Bell states.

Protocol remains effective under decoherence.

Potential applications in quantum networks.

Abstract

In this paper, we propose a protocol for complete Bell-state analysis for two superconducting-quantum-interference-device qubits. The Bell-state analysis could be completed by using a sequence of microwave pulses designed by the transition- less tracking algorithm, which is an useful method in the technique of shortcut to adiabaticity. After the whole process, the information for distinguishing four Bell states will be encoded on two auxiliary qubits, while the Bell states keep unchanged. One can read out the information by detecting the auxiliary qubits. Thus the Bell-state analysis is nondestructive. The numerical simulations show that the protocol possesses high success probability of distinguishing each Bell state with current experimental technology even when decoherence is taken into account. Thus, the protocol may have potential applications for the information readout in quantum communications and quantum computations in superconducting quantum networks.