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Дата последнего поиска статьи во внешних источниках: 2 апреля 2015 г.
Аннотация:The balanced comparator is an essential, part of RSFQ-based readout for superconducting qubits. In this paper we report measurements of the sensitiviti of the balanced comparator fabricated in a specialized 30 A/cm(2) process with 3.6 mu A critical currents and measured at 30-500 mK. At sampling frequency of 3.5 GHz the measured gray zone is Delta I = 104 nA. Due to electron overheating in the shunt resistors the effective noise temperature is 140 mK. The gray zone has a strong dependence on sampling frequency above 5 GHz; due to over-clocking. Related measurements have been reported where cooling fins and reduced critical current density of 10 A/cm(2) were used, and a quantum limited gray zone of 40 nA was achieved. This makes single shot readout possible for the phase, RF-SQUID and persistent current qubits. The readout speed is 30-50 ps, which is quite favorable for error correction schemes.