Fluxonium qubits bring the creation of a quantum computer closer misisru
The experiments are performed in a BlueFors LD-250 dilution refrigerator with a base temperature of 10 mK, as shown in Fig.. The chip is connected to the control setup with eight lines: the readout line, three lines for simultaneous single-qubit gates application and flux control , three lines connected with 10 mK stage and ended with 50 Ω terminators for qubit reset, and the coupler’s control line for two-qubit gates.
Microwave attenuators are used to isolate the qubit chip from thermal and instrumental noise from the signal sources, which are located at room temperature. The readout line is equipped with an impedance-matched parametric amplifier followed by a Quinstar CWJ1019KS414 isolator to prevent noise from higher-temperature stages entering the IMPA and the qubit device. We pump the IMPA using an Agilent E8257D signal generator. Three Raditec RADC-4.0-8.
Due to the large DC control current of ~83 μA required for qubit biasing, reset pulses, and control, we cannot install attenuators on the 10 mK stage of the cryostat to suppress thermal noise from room temperature microwave sources. Instead, we use a low-pass filter in combination with a powder filter with 15 dB attenuation close to the qubit frequencies. Capacitively coupled qubit control lines are connected to 50 Ω terminators at the 10 mK stage of the cryostat.
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