A superconducting qubit storage method and device with long decoherence time

A decoherence time and superconducting quantum technology, which is applied in the field of superconducting quantum computing, can solve the problems that the high quality factor of the superconducting cavity cannot be brought into play, the decoherence time can only reach the order of ms, and the quality factor of the superconducting cavity decreases.

Active Publication Date: 2022-05-06
PEKING UNIV
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Problems solved by technology

The quality factor of the rectangular three-dimensional cavity is only 10 when it is bare cavity. 6 , theoretically its decoherence time can only reach the order of ms
[0004] In order to apply this type of structure, we studied the experimental results after inserting a superconducting qubit sample into a three-dimensional ellipsoidal superconducting cavity, and found that the superconducting cavity will interact with the superconducting qubit sample, and its quality factor is changed from 10 to 10 down to 10 6 , which will make the advantage of the high quality factor of the superconducting cavity unable to play
The reason may be that the entry of the superconducting qubit sample interacts with the electromagnetic field in the superconducting cavity, resulting in a decrease in the quality factor of the superconducting cavity

Method used

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  • A superconducting qubit storage method and device with long decoherence time

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Embodiment Construction

[0017] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings. Such as figure 1 As shown, the superconducting qubit and the superconducting cavity coupling device of the present embodiment include: a quarter-wavelength superconducting cavity 1 (i.e., a superconducting cavity), a hollow ring structure 2, a beam tube 3, a dielectric rod 4, a coupling The antenna 5 is located in the installation groove 6 at one end of the dielectric rod 4 , the installation plate 7 , and the installation plate 8 .

[0018] Wherein, the superconducting cavity 1 is hollow cylindrical and is welded by electron beams. A round hole is opened in the central part of one end face and is seamlessly connected with the coaxial beam tube 3. The central part of the other end face is embedded to form a coaxial Hollow ring structure 2. The hollow annular structure 2 is integrally formed with the superconducting cavity, and its depth in...

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Abstract

The invention discloses a superconducting qubit storage device and method with long decoherence time. Wherein, the device includes: a quarter-wavelength superconducting resonant cavity, a dielectric rod with a superconducting qubit installation groove at one end, a beam tube, a coupling antenna, and two installation plates. The present invention applies the quarter-wavelength superconducting resonant cavity to superconducting quantum computing for the first time, and creatively solves the problem that the quality factor of the three-dimensional superconducting cavity decreases when the qubit sample is coupled with the three-dimensional superconducting cavity, and the superconducting quantum Calculations are pushed forward one step further.

Description

technical field [0001] The invention relates to superconducting quantum computing, in particular to a superconducting qubit coupled with a superconducting cavity that can maintain the long life of the superconducting qubit and at the same time maintain the high quality factor (10) of the superconducting cavity 9 and above) methods and devices. Background technique [0002] Qubit is the basic unit of quantum computing, and its physical realization mainly includes nuclear magnetic resonance, ion trap, semiconductor quantum dot, light quantum and superconducting quantum circuit, etc. As a solid-state macroscopic quantum circuit, superconducting quantum circuits use superconducting qubits as the basic unit, and superconducting qubits are represented by superconducting Josephson junctions. Strong mutual coupling strength and scalability are very promising for the physical realization of quantum computing. The most important factor restricting superconducting quantum computing i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06N10/40
CPCG06N10/00
Inventor 谢华木刘克新
Owner PEKING UNIV
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