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公开(公告)号：US12212295B2
公开(公告)日：2025-01-28
申请号：US17295577
申请日：2019-11-22
Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
Inventor： Yasunobu Nakamura , Shingo Kono , Kazuki Koshino
Abstract: This nonlinear microwave filter is provided with quantum bits that are formed on a circuit board in which target quantum bits are formed which are quantum bits controlled in a superconducting quantum circuit, and that are coupled to a control waveguide to which the target quantum bits are coupled, wherein the distance to a waveguide end in the control waveguide is within a predetermined range from semi integer times the resonant wavelength, the quantum bits have a resonant frequency in which the difference from the resonant frequency of the target quantum bits is within a predetermined range, and the coupling to the control waveguide is stronger by a predetermined value than the coupling between the target quantum bits and the control waveguide.
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公开(公告)号：US12184339B2
公开(公告)日：2024-12-31
申请号：US17790819
申请日：2020-12-28
Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
Inventor： Shingo Kono , Yasunobu Nakamura
Abstract: A microwave photon control device includes a first qubit and a second qubit that are connected in parallel to a waveguide through which microwave photons propagate, and a direct coupling between the first qubit and the second qubit. An interval between the first qubit and the second qubit is (¼+n/2) times as long as a wavelength of microwave photons (where n is an integer equal to or larger than 0). A quantum entangled state is formed between the first qubit and the second qubit. The direct coupling cancels out a coupling via the waveguide between the first qubit and the second qubit. By a relaxation rate of the first qubit and the second qubit, and a phase of the quantum entangled state being controlled, the microwave photon control device operates while switching between a first operation mode, a second operation mode, and a third operation mode.
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