Frequency multiplexing for readout of spin qubits

J. M. Hornibrook, James Colless, Alice Mahoney, Xanthe Croot, S. Blanvillain, Hong Lü, A. C. Gossard, D. J. Reilly

Abstract

We demonstrate a low loss, chip-level frequency multiplexing scheme for readout of scaled-up spin qubit devices. By integrating separate bias tees and resonator circuits on-chip for each readout channel, we realize dispersive gate-sensing in combination with charge detection based on two rf quantum point contacts (rf-QPCs). We apply this approach to perform multiplexed readout of a double quantum dot in the few-electron regime, and further demonstrate operation of a 10-channel multiplexing device. Limitations for scaling spin qubit readout to large numbers of multiplexed channels is discussed.

Locations

• Applied Physics Letters - View
• arXiv (Cornell University) - View - PDF
• DataCite API - View