Quantum state engineering with flux-biased Josephson phase qubits by Stark-chirped rapid adiabatic passages

TL;DR

This paper demonstrates how Stark-chirped rapid adiabatic passages can be used to perform robust quantum state manipulations in flux-biased Josephson phase qubits, offering an alternative to traditional pulse methods.

Contribution

It introduces a novel application of SCRAP technique for quantum control in Josephson qubits, enhancing robustness and experimental feasibility.

Findings

Adiabatic passages are insensitive to pulse details.

Universal quantum gates can be implemented.

Enhanced robustness over PI-pulses.

Abstract

In this paper, the scheme of quantum computing based on Stark chirped rapid adiabatic passage (SCRAP) technique [L. F. Wei et al., Phys. Rev. Lett. 100, 113601 (2008)] is extensively applied to implement the quantum-state manipulations in the flux-biased Josephson phase qubits. The broken-parity symmetries of bound states in flux-biased Josephson junctions are utilized to conveniently generate the desirable Stark-shifts. Then, assisted by various transition pulses universal quantum logic gates as well as arbitrary quantum-state preparations could be implemented. Compared with the usual PI-pulses operations widely used in the experiments, the adiabatic population passage proposed here is insensitive the details of the applied pulses and thus the desirable population transfers could be satisfyingly implemented. The experimental feasibility of the proposal is also discussed.