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Tunable coupler with coupling extension

A technology of couplers and resonators, applied in the field of quantum computing, can solve the problems of increasing coupling, crosstalk, limiting the amount of space, etc., to achieve the effect of compact size and shape, high precision and reproducibility

Pending Publication Date: 2022-05-06
IQM FINLAND OY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, short qubit-to-qubit distances also increase undesired coupling between pairs of qubits and between qubits and control leads, introducing crosstalk
Short qubit-to-qubit distances also limit the amount of space available for other required components such as readout resonators

Method used

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  • Tunable coupler with coupling extension
  • Tunable coupler with coupling extension
  • Tunable coupler with coupling extension

Examples

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Embodiment Construction

[0036] Figure 1 is an example of how the coupling between two qubits 101 and 102 can be affected by tuning the qubits. Assuming that qubits 101 and 102 form a standard two-qubit gate, its on and off positions correspond to strong and weak coupling between the qubits. In Fig. 1, there is a dedicated tuning input for each qubit 101 and 102, which can be used to change the resonant frequency of the corresponding qubit. For the off position, the qubits are detuned. Such an arrangement exhibits the disadvantageous features mentioned above in the description of the prior art.

[0037]FIG. 2 is an example of using a tunable coupling element 203 to affect the coupling between two qubits 201 and 202 . Figure 3 shows this example in the form of a schematic circuit diagram. The capacitive couplings 1C, C2 and 12 of FIG. 2 appear as capacitors C1C, C2C and C12 plotted in FIG. 3, respectively. The tuning inputs shown in Figure 2 are omitted in Figure 3 for clarity of the figure. A det...

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Abstract

A tunable coupler is provided for forming a controllable coupling with at least a first qubit (801, 1501). It comprises a first constant coupling element (803, 1506) and a tunable coupling element (804, 1509). The first constant coupling element (803, 1506) forms a non-electrical coupling interface to at least the first qubit (801, 1501) at a first end remote from the tunable coupling element (804, 1509). The tunable coupling element (804, 1509) is positioned adjacent to a non-electrical coupling interface to another circuit element (802, 805, 1507) formed at a second end thereof.

Description

technical field [0001] The present invention relates generally to quantum computing technology. In particular, the invention relates to hardware for generating qubits and forming a coupling between two or more qubits. Background technique [0002] In quantum computing, it has become commonplace to use the term "quantum bit (qubit)" to refer not only to the basic unit of information, but also to an information storage element used to store one qubit of information. As an example, a superconducting memory circuit with one or more qubits (ie, qubit-sized information storage elements) can be considered. In such examples, the qubit is an anharmonic oscillator, such as a transmon, and it can be coupled to a nearby readout resonator to facilitate reading out the state of the qubit stored therein. [0003] In order to implement quantum gates, it is necessary that there is a controllable coupling between qubits such that the states of the qubits can interact with each other in a co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P5/12H10N69/00
CPCH01P5/12H01P7/088G06N10/40H10N69/00G06N10/00H01L2223/6627H01L23/5223H01L23/525H01L23/66G06N10/20G06N10/70B82Y10/00
Inventor 约翰内斯·海因索C·奥克龙-科尔比
Owner IQM FINLAND OY
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