Frequency Multiplexing for Readout of Spin Qubits

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.

References in corpus (3)

• Single-shot read-out of an individual electron spin in a quantum dot
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• Frequency Division Multiplexing Readout and Simultaneous Manipulation of an Array of Flux Qubits

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