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Superconducting quantum bit and superconducting quantum circuit

A superconducting quantum and bit technology, applied in the field of quantum computing, can solve problems such as frequency crowding, unfavorable integration, and difficulty in improving decoherence time, and achieve low gate error rate and high nonlinear effects

Pending Publication Date: 2020-06-09
INST OF PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, Transmon / Xmon also has shortcomings. Due to the increase of the capacitance in the bit, although the charge noise is greatly suppressed, it also greatly weakens the nonlinearity of the qubit, which makes it easy to cause state leakage during manipulation and cannot improve control. speed
In addition, weak nonlinearity also leads to dense energy levels. When the number of integrated bits increases, it is prone to frequency crowding, which is not conducive to large-scale integration.
For other qubits with high nonlinearity, such as charge qubit (or Cooper pair box), flux qubit (Flux qubit), etc., it is difficult to improve the decoherence time

Method used

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  • Superconducting quantum bit and superconducting quantum circuit
  • Superconducting quantum bit and superconducting quantum circuit
  • Superconducting quantum bit and superconducting quantum circuit

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] Josephson junction (Josephson junction), the superconducting tunnel junction used in the present invention, is generally a structure composed of two superconductors sandwiched by a thin barrier layer (thickness ≤ coherence length of the Cooper electron pair), for example S (superconductor)-I (insulator)-S (superconductor) structure, referred to as SIS. In it, the superconducting electron pairs can pass through the insulator film from one side to the other side through the tunnel effect. When there is no voltage, the current between superconductors is called Josephson current, a...

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Abstract

The invention provides a superconducting quantum bit which comprises a bypass capacitor, a first Josephson junction and a series array of a plurality of second Josephson junctions which are connectedin parallel, and the ratio of the summary inductance of the series array of the plurality of second Josephson junctions to the junction inductance of the first Josephson junction ranges from 80% to 120%. The superconducting quantum bit is high in nonlinearity and long in decoherence time.

Description

technical field [0001] The invention belongs to the technical field of quantum computing, in particular to a superconducting qubit and a superconducting quantum circuit containing the superconducting qubit. Background technique [0002] Quantum computing technology is the pearl of the second information revolution. Due to the superposition and entanglement of quantum mechanics, quantum computers or simulators based on qubits can provide computing power far beyond that of classical computers, providing feasible solutions to certain computational problems. Superconducting quantum circuits based on superconducting Josephson circuits are currently one of the most promising and technically mature technical solutions. The basic unit of a superconducting quantum circuit is a superconducting qubit, which is generally composed of non-destructive components such as capacitors, inductors, and Josephson junctions. Two of the energy levels (generally the ground state and the first exci...

Claims

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Application Information

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IPC IPC(8): G06N10/00H01L39/22
CPCG06N10/00H10N60/12
Inventor 金贻荣宋小会李贺康王战郑东宁
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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