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Quantum circulator based on asymmetric ring cavity

A technology of circulator and ring cavity, which is applied in the direction of waveguide devices, circuits, electrical components, etc., can solve the problems of reducing the coherence time of qubits, affecting integration, and bloated measurement and control systems

Active Publication Date: 2017-09-08
UNIV OF SCI & TECH OF CHINA
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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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  • Quantum circulator based on asymmetric ring cavity
  • Quantum circulator based on asymmetric ring cavity
  • Quantum circulator based on asymmetric ring cavity

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specific Embodiment

[0040] attached figure 1 A top view of a quantum circulator based on an asymmetric ring cavity provided by an embodiment of the present invention. The invention consists of the following parts: dielectric substrate 1, ground plane 2 of circulator, coplanar waveguide transmission line 3, half-wavelength coplanar waveguide transmission cavity 4, SQUID ring 5, and 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.

[0041] The present invention will at first select the substrate used in the design process (for example: crystal orientation [100], thickness 0.5mm, silicon substrate, indicators such as scattering tangent value 2e-7), in the accompanying figure 1 In the top view of a quantum circulator based on an asymmetric ring cavity, the size of the entire structure is only 2500um×2000um, and the distance between the central conduction strip line and the co...

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Abstract

The invention discloses a quantum circulator based on an asymmetric ring cavity. The quantum circulator comprises two coplanar waveguide transmission lines, one half-wavelength coplanar waveguide transmission cavity, two SQUID rings and one DC bias line used for applying a vertical magnetic field; the SQUID rings are coupled with the half-wavelength coplanar waveguide transmission cavity; and the half-wavelength coplanar waveguide transmission cavity is coupled with the two coplanar waveguide transmission lines to form a four-port device. A very weak magnetic circulator that can operate at very low temperatures replaces a traditional circulator that must be implemented with magnetic shielding measures, so as to meet the needs of multi-quantum bit chip manipulation.

Description

technical field [0001] The invention relates to a quantum circulator of a microwave circuit, in particular to a quantum circulator based on an asymmetric ring cavity. Background technique [0002] In qubit control, the reflective cavity is generally used as the channel for qubit control and reading. From the outside of the chip, the control 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 is needed to isolate the two signals. [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 af...

Claims

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Application Information

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Patent Type & Authority Applications(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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