Photon-mediated entanglement between spin qubits beyond the dispersive regime

TL;DR

This paper theoretically explores photon-mediated entanglement between distant semiconductor spin qubits beyond the dispersive regime, showing that real photon exchange enables rapid, decoherence-resistant entanglement for quantum gate development.

Contribution

It demonstrates the feasibility of using resonant photon exchange to entangle distant spin qubits in quantum dots, extending beyond traditional dispersive coupling methods.

Findings

Real photon exchange enables rapid entanglement.

Entanglement is robust against decoherence.

Potential for quantum gate implementation in semiconductor qubits.

Abstract

Dispersively coupled distant qubits in a shared cavity can become entangled through virtual photon exchange with energy-conserving phase evolution of their quantum states. This interaction can potentially be accelerated by operating on resonance, allowing for the exchange of real photons. In this theoretical study, we examine photon-mediated entanglement between two distant spins of electrons confined in double quantum dots formed in a Si/SiGe heterostructure. We calculate the dynamics of the combined system comprised of both spin qubits and the cavity, assuming that both spin qubits can be tuned into and out of resonance with the host cavity. We demonstrate that the exchange of real photons between the two spin qubits can result in rapid entanglement that is robust against decoherence. These results pave the way for the development of quantum gates on resonantly coupled distant semiconductor spin qubits.