Multi-quantum bit control device and method based on superconducting electronics

A control device and control method technology, applied in the field of quantum computing, can solve problems such as inability to adapt to larger-scale quantum computing

Pending Publication Date: 2021-06-25
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a complete multi-qubit control device and method based on superconducting electronics, which is used to solve the problems in the prior art that cannot be adapted to larger-scale quantum calculations

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  • Multi-quantum bit control device and method based on superconducting electronics
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  • Multi-quantum bit control device and method based on superconducting electronics

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Embodiment 1

[0067] This embodiment provides a multi-qubit control device based on superconducting electronics.

[0068] When a constant current is applied to a Josephson junction, the system can be equivalent to particles moving in a washboard potential well. When the bias current plus the input current exceeds the critical current of the Josephson junction, the particles roll in the potential well , a voltage pulse is output at the output, the time integral of which is equal to a flux quantum Φ 0 (about 2.07×10 -15 Wb), the so-called superconducting SFQ pulse.

[0069] Pass the SFQ pulse train through a capacitor with a value of C C The capacitance of is coupled to the superconducting qubit (hereinafter referred to as the qubit), and the Hamiltonian of the system is expressed as:

[0070]

[0071] Taking the lowest two energy levels of the system as qubits, the Hamiltonian driven by the SFQ pulse is expressed as:

[0072]

[0073] Such as figure 1 As shown, it can be seen that...

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Abstract

The invention provides a multi-quantum bit control device and method based on superconducting electronics. The method comprises the following steps: converting a microwave pulse into an SFQ pulse signal; copying the SFQ pulse signal into N paths of SFQ sub-pulse signals which are the same as the SFQ pulse signal; respectively converting the N paths of SFQ sub-pulse signals into N paths of SFQ output pulse signals with different periods; and finally, coupling the N paths of SFQ output pulse signals to the quantum bits with the conversion frequencies matched with the N paths of SFQ output pulse signals respectively, thereby achieving the control over the N quantum bits of different periods. According to the invention, through the DC / SFQ converter driven by the single microwave source, the state control of a plurality of quantum bits with different frequencies is realized, the number of microwave sources, the DC / SFQ converter, and microwave devices and connecting lines between the microwave sources and the DC / SFQ converter is reduced, and the realization of the control of large-scale quantum bits and the integration of corresponding devices under a low-temperature condition is facilitated.

Description

technical field [0001] The invention relates to the field of quantum computing, in particular to a multi-qubit control device and method based on superconducting electronics. Background technique [0002] The superconducting quantum circuit based on the Josephson junction is highly compatible with integrated circuits in design, fabrication, measurement and integrated circuits, and the gate operation and measurement fidelity are higher than the fault-tolerant threshold of quantum computing based on topological surface coding. Computationally shows very high application potential. [0003] The current mainstream microwave-based qubit control method is realized based on N coherent microwave sources and corresponding microwave devices such as filters, mixers, amplifiers, attenuators, circulators, and isolators, and microwave connections. With the expansion of the scale of superconducting quantum circuits, the number of control qubits increases, and the thermal bearing and physi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/30H03M13/00
CPCH03M7/30H03M13/00
Inventor 林志荣刘匡江文兵王镇
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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