Cryogenic Multiplexing Control Chip for a Superconducting Quantum Processor

Huang, Rutian; Geng, Xiao; Wu, Xinyu; Dai, Genting; Yang, Liangliang; Liu, Jianshe; Chen, Wei

doi:10.1103/physrevapplied.18.064046

Cited by 5 publications

(12 citation statements)

References 47 publications

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“…, MCC-n). Each MCC is composed of BPFs and tunable superconducting isolators [22]. The frequency-domain demultiplexed microwave signals are routed to the XY control ports of superconducting qubits on a quantum processor.…”

Section: Circuit and Layout Designmentioning

confidence: 99%

“…The electric circuit of MCC with multiplex ratio 1:4 is given in Figure 2A. Various kinds of BPFs, e.g., Bessel BPF, Butterworth BPF and Chebyshev BPF of MCC were simulated [22]. Here, the BPFs are implemented by λ/2 CPW resonators.…”

Section: Circuit and Layout Designmentioning

confidence: 99%

“…The bottleneck has been aimed to be resolved by several approaches, such as cryogenic complementary metal oxide semiconductors (cryo-CMOS) device [15][16][17][18], photonic link (PL) [19], single flux quantum (SFQ) digital logic [20,21]. Our group has presented a proposal for a cryogenic multiplexing control chip (MCC), which is a nonreciprocal device and composed of tunable inductor bridges (TIB) based on SQUID arrays [22]. There are XY and Z two kinds single-qubit control operations of superconducting quantum processor.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the MCC can separate different frequencies of superconducting qubits into different channels with very low crosstalk (−80 dB) and the qubits are protected from interference. The MCC is to be working at a temperature of 20 mK, and could be directly integrated with the quantum processor in one package [22] or removed separately from the cryogenic system and act as an independent chip. Although there were demonstrations for cryo-CMOS, PL and SFQ approaches, however, an experimental realization for MCC is still in need.…”

Section: Introductionmentioning

confidence: 99%

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Design and fabrication of cryogenic multiplexing control chip

Huang,

Shi,

Geng

et al. 2023

Front. Phys.

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This paper presents a design and fabrication process of a cryogenic multiplexing control chip (MCC) for superconducting quantum computers. The working temperature of MCC can be 10 ∼ 30 mK, because it could be integrated with quantum processor in the same package. With a multiplexing ratio of 1:4 and designed working frequency 4–8 GHz, the MCC is a non-reciprocity device which consisted of bandpass filters and isolators, which are based on tunable inductor bridges (TIB). The MCC chip size is 6 × 6 mm2 and includes λ/2 coplanar waveguides resonators, superconducting quantum interference device arrays, capacitors, low pass filters, baluns and bias lines. Adopting self-aligned process of Josephson junctions, the fabrication of MCC constitutes four lithography masks. The modular design of MCC could facilitate the development of large-scale superconducting quantum computers.

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Section: Circuit and Layout Designmentioning

confidence: 99%

Section: Circuit and Layout Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design and fabrication of cryogenic multiplexing control chip

Huang,

Shi,

Geng

et al. 2023

Front. Phys.

Self Cite

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“…There two main approaches to circumvent these issues. The first is the use of frequency division multiplexing in the microwave domain [23] or utilization of photonic links with optional wavelength division multiplexing [24][25][26]. This allows the decrease of the heat inflow associated with cables at the cost of more sophisticated transmission of microwave signals.…”

Section: Introductionmentioning

confidence: 99%

Speeding up qubit control with bipolar single-flux-quantum pulse sequences

Vozhakov

Bastrakova

Klenov

et al. 2023

Quantum Sci. Technol.

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The development of quantum computers based on superconductors requires the improvement of the qubit state control approach aimed at the increase of the hardware energy efficiency. A promising solution to this problem is the use of superconducting digital circuits operating with single-flux-quantum (SFQ) pulses, moving the qubit control system into the cold chamber. However, the qubit gate time under SFQ control is still longer than under conventional microwave driving. Here we introduce the bipolar SFQ pulse control based on ternary pulse sequences. We also develop a robust optimization algorithm for finding a sequence structure that minimizes the leakage of the transmon qubit state from the computational subspace. We show that the appropriate sequence can be found for arbitrary system parameters from the practical range. The proposed bipolar SFQ control reduces a single qubit gate time by halve compared to nowadays unipolar SFQ technique, while maintaining the gate fidelity over 99.99%.

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