Coherent Spin-Spin Coupling Mediated by Virtual Microwave Photons

Coherent Spin-Spin Coupling Mediated by Virtual Microwave Photons

Harvey-Collard, P. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Dijkema, J.J. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Zheng, G. (TU Delft QCD/Vandersypen Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Sammak, A. (TU Delft BUS/TNO STAFF; TU Delft QuTech Advanced Research Centre)
Scappucci, G. (TU Delft QCD/Scappucci Lab; TU Delft QuTech Advanced Research Centre; Kavli institute of nanoscience Delft)
Vandersypen, L.M.K. (TU Delft QuTech Advanced Research Centre; TU Delft QN/Vandersypen Lab; Kavli institute of nanoscience Delft)

2022

We report the coherent coupling of two electron spins at a distance via virtual microwave photons. Each spin is trapped in a silicon double quantum dot at either end of a superconducting resonator, achieving spin-photon couplings up to around gs/2p=40 MHz. As the two spins are brought into resonance with each other, but detuned from the photons, an avoided crossing larger than the spin linewidths is observed with an exchange splitting around 2J/2p=20 MHz. In addition, photon-number states are resolved from the shift 2?s/2p=-13 MHz that they induce on the spin frequency. These observations demonstrate that we reach the strong dispersive regime of circuit quantum electrodynamics with spins. Achieving spin-spin coupling without real photons is essential to long-range two-qubit gates between spin qubits and scalable networks of spin qubits on a chip.

http://resolver.tudelft.nl/uuid:cd595d29-58fa-497e-a592-e0caa1a4691a

https://doi.org/10.1103/PhysRevX.12.021026

2160-3308

Physical Review B, 12 (2)

Institutional Repository

journal article

© 2022 P. Harvey-Collard, J.J. Dijkema, G. Zheng, A. Sammak, G. Scappucci, L.M.K. Vandersypen