Performing a calibration process in a quantum computing system
In a general aspect, calibration is performed in a quantum computing system. In some cases, domains of a quantum computing system are identified, where the domains include respective domain control subsystems and respective subsets of quantum circuit devices in a quantum processor of the quantum computing system. Sets of measurements are obtained from one of the domains and stored in memory. Device characteristics of the quantum circuit devices of the domain are obtained based on the set of measurements, and the device characteristics are stored in a memory of the control system. Quantum logic control parameters for the subset of quantum circuit devices of the domain are obtained based on the set of measurements and stored in memory.
1 . A method comprising:
identifying domains of a quantum computing system by operation of a control system, the domains comprising respective domain control subsystems and respective subsets of quantum circuit devices in a quantum processor of the quantum computing system;
obtaining a first set of measurements from a first domain of the domains, wherein obtaining the first set of measurements comprises performing a continuous wave (CW) bring-up process;
determining, by operation of the control system, device characteristics of the quantum circuit devices of the first domain based on the first set of measurements,;
storing the device characteristics in a memory of the control system;
obtaining a second set of measurements from the first domain;
determining, by operation of the control system, quantum logic control parameters for the quantum circuit devices of the first domain based on the second set of measurements; and
storing the quantum logic control parameters in a database of the control system for use in operating the first domain.
2 . The method of claim 1 , wherein the domains are defined in part by hardware, control logic, physical connections, or software in the quantum computing system.
3 . The method of claim 1 , wherein the quantum circuit devices of the first domain include qubit devices and readout devices.
4 . The method of claim 1 , wherein the control system comprises a controller, the controller including a cache, signal conversion circuitry, a filter, and an amplifier.
5 . The method of claim 4 , wherein the control system comprises an embedded operating system configured to communicate with the database and the controller.
6 . The method of claim 1 , wherein the device characteristics comprise resonance frequencies and coherence times for qubit devices in the first domain.
7 . The method of claim 1 , wherein the CW bring-up process comprises CW cavity spectroscopy.
8 . The method of claim 1 , wherein the CW bring-up process comprises CW qubit spectroscopy.
9 . The method of claim 1 , wherein the CW bring-up process comprises CW Josephson parametric amplifier (JPA) single-tone spectroscopy.
10 . The method of claim 1 , wherein the CW bring-up process comprises CW JPA gain optimization.
11 . A quantum computing system comprising:
a quantum processor comprising quantum circuit devices; and
a control system configured to:
identify domains of the quantum computing system, the domains comprising respective domain control subsystems and respective subsets of the quantum circuit devices;
obtain a first set of measurements from a first domain of the domains, wherein obtaining the first set of measurements comprises performing a continuous wave (CW) bring-up process;
determine device characteristics of the quantum circuit devices of the first domain based on the first set of measurements;
obtain a second set of measurements from the first domain;
determine quantum logic control parameters for the quantum circuit devices of the first domain based on the second set of measurements; and
store the quantum logic control parameters in a database of the control system for use in operating the first domain.
12 . The system of claim 11 , wherein the domains are defined in part by hardware, control logic, physical connections, or software in the quantum computing system.
13 . The system of claim 11 , wherein the quantum circuit devices of the first domain include qubit devices and readout devices.
14 . The system of claim 11 , wherein the control system comprises a controller, the controller including a cache, signal conversion circuitry, a filter, and an amplifier.
15 . The system of claim 14 , wherein the control system comprises an embedded operating system configured to communicate with the database and the controller.
16 . The system of claim 11 , wherein the device characteristics comprise resonance frequencies and coherence times for qubit devices in the first domain.
17 . The system of claim 11 , wherein the CW bring-up process comprises CW cavity spectroscopy.
18 . The system of claim 11 , wherein the CW bring-up process comprises CW qubit spectroscopy.
19 . The system of claim 11 , wherein the CW bring-up process comprises CW Josephson parametric amplifier (JPA) single-tone spectroscopy.
20 . The system of claim 11 , wherein the CW bring-up process comprises CW JPA gain optimization.