Longitudinal coupling between electrically driven spinqubits and a resonator
Abstract
At the core of the semiconducting spin qubits success is the ability to manipulate them electrically, enabled by the spinorbit interactions. However, most implementations require external magnetic fields to define the spin qubit, which in turn activate various charge noise mechanisms. Here we study spin qubits confined in quantum dots at zero magnetic fields, that are driven periodically by electrical fields and are coupled to a microwave resonator. Using Floquet theory, we identify a welldefined Floquet spinqubit originating from the lowest degenerate spin states in the absence of driving. We find both transverse and longitudinal couplings between the Floquet spin qubit and the resonator, which can be selectively activated by modifying the driving frequency. We show how these couplings can facilitate fast qubit readout and the implementation of a twoqubit CPHASE gate. Finally, we use adiabatic perturbation theory to demonstrate that the spinphoton couplings originate from the nonAbelian geometry of states endowed by the spinorbit interactions, rendering these findings general and applicable to a wide range of solidstate spin qubits.
 Publication:

arXiv eprints
 Pub Date:
 January 2023
 DOI:
 10.48550/arXiv.2301.10163
 arXiv:
 arXiv:2301.10163
 Bibcode:
 2023arXiv230110163P
 Keywords:

 Condensed Matter  Mesoscale and Nanoscale Physics;
 Quantum Physics