Junction Yield Analysis for 10 V Programmable Josephson Voltage Standard Devices

Fox, Anna E.; Dresselhaus, Paul D.; Rüfenacht, Alain; Sanders, Aric W.; Benz, Samuel P.

doi:10.1109/tasc.2014.2377744

Cited by 28 publications

(10 citation statements)

References 17 publications

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“…Capitalizing on pulse-area quantization enables the use of JJ arrays to construct exceptionally stable and repeatable voltage sources from dc to a few gigahertz [ 13 – 16 ]. Similar devices are used to realize intrinsically accurate voltages for the international system of units and are disseminated worldwide as primary dc and ac voltage standards [ 17 , 18 ]. Furthermore, the use of SFQ pulses has been proposed as a scalable paradigm for digitally controlling qubits [ 19 – 21 ] and has recently been demonstrated with a SFQ driver and qubit circuit cofabricated on the same chip [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Digital Control of a Superconducting Qubit Using a Josephson Pulse Generator at 3 K

et al. 2022

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Scaling of quantum computers to fault-tolerant levels relies critically on the integration of energy-efficient, stable, and reproducible qubit control and readout electronics. In comparison to traditional semiconductor-control electronics (TSCE) located at room temperature, the signals generated by rf sources based on Josephson-junctions (JJs) benefit from small device sizes, low power dissipation, intrinsic calibration, superior reproducibility, and insensitivity to ambient fluctuations. Previous experiments to colocate qubits and JJ-based control electronics have resulted in quasiparticle poisoning of the qubit, degrading the coherence and lifetime of the qubit. In this paper, we digitally control a 0.01-K transmon qubit with pulses from a Josephson pulse generator (JPG) located at the 3-K stage of a dilution refrigerator. We directly compare the qubit lifetime T 1 , the coherence time , and the thermal occupation P th when the qubit is controlled by the JPG circuit versus the TSCE setup. We find agreement to within the daily fluctuations of ±0.5 μ s and ±2 μ s for T 1 and , respectively, and agreement to within the 1% error for P th . Additionally, we perform randomized benchmarking to measure an average JPG gate error of 2.1 × 10 −2 . In combination with a small device size ( < 25 mm 2 ) and low on-chip power dissipation (≪100 μ W), these results are an important step toward demonstrating the viability of using JJ-based control electronics located at temperature stages higher than the mixing-chamber stage in highly scaled superconducting quantum information systems.

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Section: Introductionmentioning

confidence: 99%

Digital Control of a Superconducting Qubit Using a Josephson Pulse Generator at 3 K

et al. 2022

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“…The individual JJs have an area of 56 μm 2 and an average junction resistance of 4 mΩ. A detailed description of the fabrication is presented elsewhere [14]–[16]. …”

Section: Advances In On-chip Circuitsmentioning

confidence: 99%

Two-Volt Josephson Arbitrary Waveform Synthesizer Using Wilkinson Dividers

Flowers-Jacobs

Fox²,

Dresselhaus³

et al. 2016

IEEE Trans. Appl. Supercond.

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The root-mean-square (rms) output voltage of the NIST Josephson arbitrary waveform synthesizer (JAWS) has been doubled from 1 V to a record 2 V by combining two new 1 V chips on a cryocooler. This higher voltage will improve calibrations of ac thermal voltage converters and precision voltage measurements that require state-of-the-art quantum accuracy, stability, and signal-to-noise ratio. We achieved this increase in output voltage by using four on-chip Wilkinson dividers and eight inner-outer dc blocks, which enable biasing of eight Josephson junction (JJ) arrays with high-speed inputs from only four high-speed pulse generator channels. This approach halves the number of pulse generator channels required in future JAWS systems. We also implemented on-chip superconducting interconnects between JJ arrays, which reduces systematic errors and enables a new modular chip package. Finally, we demonstrate a new technique for measuring and visualizing the operating current range that reduces the measurement time by almost two orders of magnitude and reveals the relationship between distortion in the output spectrum and output pulse sequence errors.

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“…To reduce the temperature sensitivity of the JPG we have departed from the superconductor-normal metalsuperconductor (SNS) JJ technology [61] based on triple-stacked self-shunted niobium-doped-silicon barriers (NbSi) embedded in the center conductor of a niobium (Nb) superconducting coplanar waveguide. Instead, we form the JPG array from externally shunted superconductor-insulator-superconductor (SIS) junctions, as can be seen in Fig.…”

Section: Digital Qubit Control Fidelity Limitsmentioning

confidence: 99%

Digital control of a superconducting qubit using a Josephson pulse generator at 3 K

Howe¹,

Castellanos-Beltran²,

Sirois³

et al. 2021

Preprint

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Scaling of quantum computers to fault-tolerant levels relies critically on the integration of energyefficient, stable, and reproducible qubit control and readout electronics. In comparison to traditional semiconductor control electronics (TSCE) located at room temperature, the signals generated by Josephson junction (JJ) based rf sources benefit from small device sizes, low power dissipation, intrinsic calibration, superior reproducibility, and insensitivity to ambient fluctuations. Previous experiments to co-locate qubits and JJ-based control electronics resulted in quasiparticle poisoning of the qubit; degrading the qubit's coherence and lifetime. In this paper, we digitally control a 0.01 K transmon qubit with pulses from a Josephson pulse generator (JPG) located at the 3 K stage of a dilution refrigerator. We directly compare the qubit lifetime T1, coherence time T * 2 , and thermal occupation P th when the qubit is controlled by the JPG circuit versus the TSCE setup. We find agreement to within the daily fluctuations on ±0.5 µs and ±2 µs for T1 and T * 2 , respectively, and agreement to within the 1% error for P th . Additionally, we perform randomized benchmarking to measure an average JPG gate error of 2.1 × 10 −2 . In combination with a small device size (< 25 mm 2 ) and low on-chip power dissipation ( 100 µW), these results are an important step towards demonstrating the viability of using JJ-based control electronics located at temperature stages higher than the mixing chamber stage in highly-scaled superconducting quantum information systems.

show abstract

Junction Yield Analysis for 10 V Programmable Josephson Voltage Standard Devices

Cited by 28 publications

References 17 publications

Digital Control of a Superconducting Qubit Using a Josephson Pulse Generator at 3 K

Digital Control of a Superconducting Qubit Using a Josephson Pulse Generator at 3 K

Two-Volt Josephson Arbitrary Waveform Synthesizer Using Wilkinson Dividers

Digital control of a superconducting qubit using a Josephson pulse generator at 3 K

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