Fast quantum state transfer and entanglement for cavity-coupled many qubits via dark pathways

TL;DR

This paper introduces a fast, high-fidelity method for quantum state transfer and entanglement generation in cavity-coupled qubits using dark pathways and shortcut to adiabaticity, enhancing quantum information processing.

Contribution

The authors develop a general, experimentally feasible scheme for rapid quantum state transfer and entanglement in multi-qubit systems via dark pathways, surpassing traditional adiabatic methods.

Findings

Achieves high-fidelity quantum state transfer and entanglement in shorter times.

Allows selective manipulation of qubits without decoupling others.

Can be implemented in superconducting quantum circuits.

Abstract

Quantum state transfer (QST) and entangled state generation (ESG) are important building blocks for modern quantum information processing. To achieve these tasks, convention wisdom is to consult the quantum adiabatic evolution, which is time-consuming, and thus is of low fidelity. Here, using the shortcut to adiabaticity technique, we propose a general method to realize high-fidelity fast QST and ESG in a cavity-coupled many qubits system via its dark pathways, which can be further designed for high-fidelity quantum tasks with different optimization purpose. Specifically, with a proper dark pathway, QST and ESG between any two qubits can be achieved without decoupling the others, which simplifies experimental demonstrations. Meanwhile, ESG among all qubits can also be realized in a single step. In addition, our scheme can be implemented in many quantum systems, and we illustrate its implementation on superconducting quantum circuits. Therefore, we propose a powerful strategy for selective quantum manipulation, which is promising in cavity coupled quantum systems and could find many convenient applications in quantum information processing.