-
公开(公告)号：US20250046977A1
公开(公告)日：2025-02-06
申请号：US18801299
申请日：2024-08-12
Applicant: Google LLC
Inventor： Ofer Naaman
Abstract: An apparatus includes a directional coupler and an absorptive low pass filter, in which the directional coupler has a first transmission line extending from a first port to a second port and a second transmission line extending from a third port to a fourth port, the first transmission line and the second transmission line configured such that a portion of a signal travelling from the first port onto the first transmission line is coupled to the second transmission line and towards the third port. The second port is connected to the fourth port of the directional coupler via the absorptive low pass filter. When the signal is input into the first port of the directional coupler and output through the third port of the directional coupler, the signal is substantially unattenuated if the frequency of the signal is in a passband of the absorptive low pass filter.
-
公开(公告)号：US20240289666A1
公开(公告)日：2024-08-29
申请号：US18176394
申请日：2023-02-28
Applicant: Google LLC
Inventor： Ofer Naaman
Abstract: The disclosure is towards parametric amplifiers with inductive input coupling for quantum computing systems. One example aspect of the present disclosure is directed to a quantum computing system comprising a first qubit, a first measurement device, and a first amplifier. The first measurement device is configured to generate a first qubit signal corresponding to a first quantum state of the first qubit. The first amplifier is configured to amplify the first qubit signal. The first amplifier comprises a first transmission-line resonator. The first transmission-line resonator provides an inductive reactance for an electrical coupling between the first measurement device and the first amplifier. The inductive reactance for the electrical coupling enables a transmission of the first qubit signal.
-
公开(公告)号：US11600763B2
公开(公告)日：2023-03-07
申请号：US16964053
申请日：2019-07-25
Applicant: Google LLC
Inventor： Brian James Burkett , Ofer Naaman , Anthony Edward Megrant , Theodore Charles White
Abstract: Methods, systems and apparatus for forming Josephson junctions with reduced stray inductance. In one aspect, a device includes a substrate; a first superconductor layer on the substrate; an insulator layer on the first superconductor layer; a second superconductor layer on the insulator layer, wherein the first superconductor layer, the insulator layer, and the second superconductor layer form a superconductor tunnel junction; and a third superconductor layer directly on a surface of the first superconductor layer and directly on a surface of the second superconductor layer to provide a first contact to the superconducting tunnel junction and a second contact to the superconductor tunnel junction, respectively.
-
公开(公告)号：US11588472B1
公开(公告)日：2023-02-21
申请号：US17109362
申请日：2020-12-02
Applicant: Google LLC
Inventor： Ofer Naaman
Abstract: The technology relates to quantum computing devices and test arrangements for detecting information from the qubits of such devices. According to aspects of the technology, a Purcell filter is structured in a multi-pole architecture to provide a sharper filter response having a flatter signal pass band, sharper turn-off skirt, and enhanced out of band rejection. The system is able to determine the states of the qubits by detecting the frequency of the readout resonators of the test arrangement. The Purcell filter is configured to be sharply tuned to enable faster readout to avoid issues associated with a longer relaxation time (T1) of the qubits.
-
公开(公告)号：US20220337207A1
公开(公告)日：2022-10-20
申请号：US17763331
申请日：2020-09-23
Applicant: Google LLC
Inventor： Ofer Naaman , Evan Jeffrey , Theodore Charles White
IPC: H03F19/00
Abstract: A circuit is presented which includes a first amplifier having an input, a transmission line having first and second ends. The first end of the transmission line is coupled to an input of the first amplifier and a plurality of channels. Each channel includes a plurality of resonators arranged to read out a plurality of qubits, respectively and a readout line arranged to receive read out signals from the plurality of resonators. The readout line of each channel is coupled to the transmission line and each channel is configured to output a respective signal in a respective frequency band which is different from frequency bands of other channels in the plurality of channels.
-
Patent Agency Ranking
公开(公告)号：US12062827B2
公开(公告)日：2024-08-13
申请号：US17297178
申请日：2019-02-01
Applicant: GOOGLE LLC
Inventor： Ofer Naaman
Abstract: An apparatus includes a directional coupler and an absorptive low pass filter, in which the directional coupler has a first transmission line extending from a first port to a second port and a second transmission line extending from a third port to a fourth port, the first transmission line and the second transmission line configured such that a portion of a signal travelling from the first port onto the first transmission line is coupled to the second transmission line and towards the third port. The second port is connected to the fourth port of the directional coupler via the absorptive low pass filter. When the signal is input into the first port of the directional coupler and output through the third port of the directional coupler, the signal is substantially unattenuated if the frequency of the signal is in a passband of the absorptive low pass filter.
-
公开(公告)号：US20240204779A1
公开(公告)日：2024-06-20
申请号：US18556039
申请日：2022-04-12
Applicant: Google LLC
Inventor： Ofer Naaman
IPC: H03K17/92
CPC classification number: H03K17/92
Abstract: A Josephson parametric device (e.g., a circulator/isolator or directional amplifier) can include a plurality of resonant modes, a plurality of couplings, an input port and an output port. The plurality of resonant modes includes first, second, and third resonant modes, the first and third resonant modes both configured to operate at a first resonant frequency and the second resonant mode configured to operate at a second resonant frequency that is different than the first resonant frequency. The plurality of couplings includes a passive coupling between the first and third resonant modes, a first parametric coupling between the first and second resonant modes, and a second parametric coupling between the second and third resonant modes. The input port is coupled to the first resonant mode of the device, and the output port is coupled to the third resonant mode of the device.
-
公开(公告)号：US20230225223A1
公开(公告)日：2023-07-13
申请号：US18117918
申请日：2023-03-06
Applicant: Google LLC
Inventor： Brian James Burkett , Ofer Naaman , Anthony Edward Megrant , Theodore Charles White
CPC classification number: H10N60/0912 , G06N10/00 , H10N60/12 , H10N60/805
Abstract: Methods, systems and apparatus for forming Josephson junctions with reduced stray inductance. In one aspect, a device includes a substrate; a first superconductor layer on the substrate; an insulator layer on the first superconductor layer; a second superconductor layer on the insulator layer, wherein the first superconductor layer, the insulator layer, and the second superconductor layer form a superconductor tunnel junction; and a third superconductor layer directly on a surface of the first superconductor layer and directly on a surface of the second superconductor layer to provide a first contact to the superconducting tunnel junction and a second contact to the superconductor tunnel junction, respectively.
-
公开(公告)号：US20230006626A1
公开(公告)日：2023-01-05
申请号：US17780464
申请日：2020-11-25
Applicant: Google LLC
Inventor： Ofer Naaman
IPC: H03F19/00
Abstract: A Josephson parametric device is presented, which includes an input port, an output port, and a signal path between the input port and the output port. The signal path includes a first section coupled to the input port and having a first passband, a second section coupled to the output port and having a second passband and a Josephson junction coupling element for parametric coupling between the first and second section. The Josephson junction coupling element is coupled to and interposed between the first section and the second section. The Josephson junction coupling element is configured such that, in response to the input port receiving a first signal at a first frequency lying within the first passband and the Josephson junction coupling element receiving a pump tone, the Josephson junction coupling element converts the first signal into a second signal with a second frequency lying within the second passband.
-
公开(公告)号：US11799432B2
公开(公告)日：2023-10-24
申请号：US17763331
申请日：2020-09-23
Applicant: Google LLC
Inventor： Ofer Naaman , Evan Jeffrey , Theodore Charles White
CPC classification number: H03F19/00 , H03F2200/165 , H03F2200/171
Abstract: A circuit is presented which includes a first amplifier having an input, a transmission line having first and second ends. The first end of the transmission line is coupled to an input of the first amplifier and a plurality of channels. Each channel includes a plurality of resonators arranged to read out a plurality of qubits, respectively and a readout line arranged to receive read out signals from the plurality of resonators. The readout line of each channel is coupled to the transmission line and each channel is configured to output a respective signal in a respective frequency band which is different from frequency bands of other channels in the plurality of channels.
-
-
-
-
-
-
-
-
-
Search Results
15
records
(took 0.015 seconds)
