On-chip RSFQ microwave pulse generator using a multi-flux-quantum driver for controlling superconducting qubits

Takeuchi, Naoki; Ozawa, D.; Yamanashi, Yuki; Yoshikawa, Nobuyuki

doi:10.1016/j.physc.2010.05.159

Cited by 18 publications

(11 citation statements)

References 13 publications

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“…0.45 mV, is adjustable by changing the parameter of Josephson Junctions in the RSFQ MPG for different applications. The MFQ pulse train is then converted to diverse 5-GHz microwave pulses in figures 12(b) and (c) through alternative filters (one is a lowpass filter utilized in our previous work [11], and the other is the 5th-order bandpass filter in this work). It is noticed that an output microwave with much slower rise time can be acquired when the proposed sharp-selectivity bandpass filter is applied, thus demonstrating the effectiveness of this work for quantum computing applications.…”

Section: Resultsmentioning

confidence: 99%

“…Note that, an M1 layer is placed outside of the lumped elements to shunt C 12 , C 23 , C 34 , and L 45 to ground. Note that the total size of the filter is 1650 μm×350 μm, which is 53% reduced from our previous lowpass filter designed in [11].…”

Section: Physical Implementationmentioning

confidence: 90%

“…Recently, low temperature superconducting (LTS) microwave circuits have been extensively investigated for superconducting quantum computing systems [5][6][7][8][9]. Specifically, we have been developing an on-chip rapid singleflux-quantum microwave pulse generator (RSFQ MPG) [10,11] to control superconducting qubits in a scalable quantum computing system [12]. Figure 1 illustrates the schematic of an RSFQ MPG.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sharp-selectivity in-line topology low temperature superconducting bandpass filter for superconducting quantum applications

Michibayashi

Takeuchi

et al. 2020

Supercond. Sci. Technol.

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This paper presents a new class of sharp-selectivity low-temperature superconducting filter that incorporates lumped element resonant couplings. Dependent on a novel synthesis approach, the proposed filter exhibits great advantages such as: (1) a very simple in-line topology (without any cross coupling), (2) extremely compact size based on lumped inductor-capacitor (LC) elements, and (3) multiple transmission zeros (TZs) independently generated and controlled (via each resonant coupling). To facilitate the physical implementation, a group of lumped element circuit models are detailed, where series LC units are adopted for both the resonators and the resonant couplings. Considering an in-line topology here, the entire filter layout is then designed by cascading the lumped models one after another. For verification, a 5th-order bandpass filter centered at 5 GHz, with 500 MHz bandwidth and 3 TZs, is designed, simulated, and tested at cryogenic temperature (4.2 K). Moreover, preliminary simulations of the presented filter in series with an on-chip rapid single-flux-quantum microwave pulse generator are discussed for superconducting quantum applications.

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Section: Resultsmentioning

confidence: 99%

Section: Physical Implementationmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Sharp-selectivity in-line topology low temperature superconducting bandpass filter for superconducting quantum applications

Michibayashi

Takeuchi

et al. 2020

Supercond. Sci. Technol.

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“…There have been experimental demonstrations of SFQbased circuits for qubit biasing [7][8][9], and fluxon-based schemes for qubit measurement have been proposed [10] and recently realized [11]. In addition, there has been a proposal to generate microwave pulses for qubit control by appropriately filtering SFQ pulse trains [12], although the required filter and matching sections would be challenging to realize practically. Up to now, however, there has been no compelling proposal for the realization of coherent quantum control of superconducting qubit and linear cavity modes by direct excitation via SFQ pulses.…”

Section: Introductionmentioning

confidence: 99%

Accurate Qubit Control with Single Flux Quantum Pulses

McDermott

Vavilov

2014

Phys. Rev. Applied

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We describe the coherent manipulation of harmonic oscillator and qubit modes using resonant trains of single flux quantum pulses in place of microwaves. We show that coherent rotations are obtained for pulse-to-pulse spacing equal to the period of the oscillator. We consider a protocol for preparing bright and dark harmonic oscillator pointer states. Next we analyze rotations of a two-state qubit system. We calculate gate errors due to timing jitter of the single flux quantum pulses and due to weak anharmonicity of the qubit. We show that gate fidelities in excess of 99.9% are achievable for sequence lengths of order 20 ns.

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“…Assuming a practical Ic of 150 A, Ic0 gives 0.31 aJ, which indicates the high energy efficiency of superconductor logic families. Therefore, numerous superconductor digital circuits have been designed and demonstrated for applications such as energy-efficient microprocessors [5][6][7] , readout electronics for cryogenic detectors [8][9][10] , and interface circuits for superconductor quantum bits [11][12][13] . The performance of these superconductor digital circuits has been continuously improved by the advancement of Nb integrated-circuit fabrication technologies 14,15 .…”

mentioning

confidence: 99%

An adiabatic superconductor 8-bit adder with 24kBT energy dissipation per junction

Takeuchi

Yamae

Ayala

et al. 2019

Applied Physics Letters

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Adiabatic quantum-flux-parametron (AQFP) logic is an energy-efficient superconductor logic family. In this paper, we conducted high-frequency operation and energy measurement of an AQFP circuit with more than 1,000 Josephson junctions in the experiment. We designed an 8-bit carry look-ahead adder (CLA) using AQFP gates and fabricated it using an advanced fabrication technology, the AIST 10 kA/cm 2 Nb high-speed standard process (HSTP). The correct operation of the 8-bit CLA was demonstrated at a 1-GHz clock frequency for a critical carry propagation test vector. The energy dissipation of the 8-bit CLA was measured by observing the power of excitation current. Our results showed that the energy dissipation per operation of the 8-bit CLA can be estimated to be approximately 1.5 aJ, or 24 kBT per junction, where kB is the Boltzmann's constant and T is the operating temperature.

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On-chip RSFQ microwave pulse generator using a multi-flux-quantum driver for controlling superconducting qubits

Cited by 18 publications

References 13 publications

Sharp-selectivity in-line topology low temperature superconducting bandpass filter for superconducting quantum applications

Sharp-selectivity in-line topology low temperature superconducting bandpass filter for superconducting quantum applications

Accurate Qubit Control with Single Flux Quantum Pulses

An adiabatic superconductor 8-bit adder with 24kBT energy dissipation per junction

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