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A quantum circulator based on an asymmetric ring cavity

A circulator and annular cavity technology, which is applied to waveguide-type devices, circuits, electrical components, etc., can solve the problems of bulky measurement and control systems, affecting integration, and excessive magnetic fields.

Active Publication Date: 2022-07-15
UNIV OF SCI & TECH OF CHINA
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  • Description
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Problems solved by technology

[0003] Traditional circulators work by using the anisotropic properties of magnetic field bias ferrite materials, but the magnetic field is too strong, which will seriously reduce the coherence time of qubits, so the circulator can only be magnetically shielded
When controlling a multi-qubit chip, multiple circulators need to be added, which makes the measurement and control system of the entire quantum chip very bloated and affects further integration

Method used

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  • A quantum circulator based on an asymmetric ring cavity
  • A quantum circulator based on an asymmetric ring cavity
  • A quantum circulator based on an asymmetric ring cavity

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specific Embodiment

[0039] attached figure 1 This is a top view of a quantum circulator based on an asymmetric annular cavity provided by an embodiment of the present invention. The invention consists of the following parts: a dielectric substrate 1, a ground plane 2 of a circulator, a coplanar waveguide transmission line 3, a half-wavelength coplanar waveguide transmission cavity 4, a SQUID ring 5, and a DC bias line 6. All gray areas are metal deposition areas, the metal material used is aluminum or niobium, and white areas are areas without metal, which are bare substrates.

[0040] In the design process of the present invention, the substrate to be used (for example: crystal orientation [100], thickness 0.5mm, silicon substrate, scattering tangent 2e-7 and other indicators) should be selected first. figure 1 In the top view of a quantum circulator based on an asymmetric annular cavity shown, the size of the entire structure is only 2500um×2000um, and the spacing ratio between the central str...

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Abstract

The invention discloses a quantum circulator based on an asymmetric annular cavity, comprising two coplanar waveguide transmission lines, a half-wavelength coplanar waveguide transmission cavity, two SQUID rings and a direct current bias line for applying a vertical magnetic field; The SQUID ring is coupled with a half-wavelength coplanar waveguide transmission cavity, and the half-wavelength coplanar waveguide transmission cavity is coupled with two coplanar waveguide transmission lines to form a four-port device. An extremely weak magnetic circulator that can work at extremely low temperatures can replace the traditional circulator that must implement magnetic shielding measures to meet the needs of multi-qubit chip manipulation.

Description

technical field [0001] The invention relates to a quantum circulator for microwave circuits, in particular to a quantum circulator based on an asymmetric annular cavity. Background technique [0002] In qubit manipulation, the reflective cavity is generally used as the channel for qubit manipulation and reading. From the outside of the chip, the manipulation signal and the feedback signal pass through the same port. In order to eliminate the interference between the control signal and the feedback signal, a microwave circulator needs to be used to isolate the two signals. [0003] The traditional circulator works by using the magnetic field to bias the anisotropic properties of the ferrite material, but the magnetic field is too strong, which will seriously reduce the coherence time of the qubit, so the circulator can only be magnetically shielded. When manipulating a multi-qubit chip, multiple circulators need to be added, which makes the measurement and control system of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/38
CPCH01P1/38
Inventor 郭国平杨鑫鑫孔伟成贾志龙段鹏薛光明郭光灿
Owner UNIV OF SCI & TECH OF CHINA
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