Xin-Lei Hei

Jul 22, 2024 | link.aps.org | Quantum Optoelectronic Devices |Xi'an Jiaotong |Xin-Lei Hei |Yu-Bo Hou

We study the hybrid system of a high-quality yttrium-iron-garnet (YIG) sphere magnetically coupled to a superconducting flux qubit via the magnetic fields created by two persistent-current quantum states. When the flux qubit is operated away from its sweet point, a coherent nonlinear two-magnon interaction can be predicted; that is, the qubit is excited by absorbing a pair of magnons.

Apr 18, 2024 | link.aps.org | Xue-Feng Pan |Quantum Optoelectronic Devices |Xi'an Jiaotong |Xin-Lei Hei

Skyrmion qubits are a new highly promising logic element for quantum information processing. However, their scalability to multiple interacting qubits remains challenging. We propose a hybrid quantum setup with skyrmion qubits strongly coupled to nanomechanical cantilevers via magnetic coupling, which harnesses phonons as quantum interfaces for the manipulation of distant skyrmion qubits.

Feb 24, 2023 | link.aps.org | Quantum Optoelectronic Devices |Xi'an Jiaotong |Xin-Lei Hei |Xue-Feng Pan

Abstract Spin-mechanical hybrid systems have been widely used in quantum information processing. However, the spin-mechanical interaction is generally weak, making it a critical challenge to enhance the spin-mechanical interaction into the strong coupling or even ultrastrong coupling regime. Here, we propose a protocol that can significantly enhance the spin-mechanical coupling strength with a diamond spin vacancy and a levitated micromagnet.

Feb 16, 2023 | link.aps.org | Quantum Optoelectronic Devices |Xi’an Jiaotong |Xin-Lei Hei |Bo-Long Wang

Abstract We present a hybrid quantum system composed of a magnetic vortex and a nanomechanical resonator. We show that the gyrotropic mode of the vortex can coherently couple to the quantized mechanical motion of the resonator through magnetic interaction.

Feb 15, 2023 | link.aps.org | Quantum Optoelectronic Devices |Xi’an Jiaotong |Xin-Lei Hei |Peng-Bo Li

Abstract Coherent tripartite interactions among degrees of freedom of completely different nature are instrumental for quantum information and simulation technologies, but they are generally difficult to realize and remain largely unexplored. Here, we predict a tripartite coupling mechanism in a hybrid setup comprising a single nitrogen-vacancy (NV) center and a micromagnet.