Kavli Affiliate: Giordano Scappucci
| First 5 Authors: Patrick Harvey-Collard, Jurgen Dijkema, Guoji Zheng, Amir Sammak, Giordano Scappucci
| Summary:
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 $g_s/2pi = 40 text{MHz}$. 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
$2J/2pi = 20 text{MHz}$. In addition, photon number states are resolved
from the shift $2chi_s/2pi = -13 text{MHz}$ they induce on the spin
frequency. These results could enable long-range two-qubit gates between spin
qubits and scalable networks of spin qubits on a chip.
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