This paper investigates the feasibility of using memristor-based DC sources for biasing quantum dot arrays at cryogenic temperatures. The key highlights are:
The authors demonstrate the cryogenic operation of a commercial operational amplifier (AD8605) down to 1.2 K, which is a critical component for the memristor-based DC source prototype.
The memristor-based DC source prototype is characterized at both room temperature and 1.2 K. At room temperature, the prototype exhibits a tunable output voltage range of 0.4 V to 0.65 V with a 10 mV resolution. At 1.2 K, the prototype can sweep a 0.4 V to 0.65 V range, but with a lower voltage resolution due to the higher resistance of the memristors at cryogenic temperatures.
The stability of the programmed output voltages is evaluated, showing a drift of only 1 μV/s at 1.2 K, which is compatible with the coherence time of spin qubits.
To address the power consumption and voltage resolution limitations of the discrete prototype, the authors propose a fully integrated CMOS-memristor approach. Simulations suggest this integrated design can reduce the power consumption to 10 μW per DC source and enable the integration of up to 300,000 DC sources at the 4.2 K stage of a dilution fridge, paving the way for large-scale quantum computing applications.
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