System and method for qubit readout
AssigneeNorthrop Grumman Systems Corporation
InventorOfer Naaman
Life of this patent
Estimating the term…
Abstract
A system is provided for multiplexed readout of qubits. The system comprises a plurality of bandpass (BP) filter resonant sections that are each coupled to a different respective point on a read line, wherein each BP filter resonant section is coupleable to a respective qubit through a respective qubit readout resonator. The system further comprises a plurality of tunable couplers, wherein each tunable coupler is coupled between a respective BP filter resonant section and a qubit readout resonator, and a coupling controller that controls the coupling strength of each qubit to the read line by controlling the impedance of each tunable coupler of the plurality of tunable couplers.
Claims20
A system for readout of qubits, the system comprising:
- a plurality of bandpass (BP) filter resonant sections that are each coupled to a different respective point on a read line, wherein each BP filter resonant section is coupleable to a respective qubit through a respective qubit readout resonator;
- a plurality of tunable couplers, wherein each tunable coupler is coupled between a respective BP filter resonant section and a qubit readout resonator;
- and
- a coupling controller that controls the coupling strength of each qubit to the read line by controlling the impedance of each tunable coupler of the plurality of tunable couplers.
A system for multiplexed readout of qubits, the system comprising:
- a plurality of bandpass (BP) filter resonant sections forming a BP filter, each BP filter resonant section being coupled between a different respective point on a read line and a respective qubit through its respective qubit readout resonator;
- a plurality of tunable couplers, each tunable coupler being galvanically coupled to a respective BP filter resonant section, wherein each tunable coupler is a superconducting quantum interference device (SQUID) having at least one Josephson junction, such that flux induced in the SQUID changes the inductance of the at least one Josephson junction and the coupling strength of its respective qubit to the read line;
- and
- a coupling controller that controls the coupling strength of each qubit to the read line by controlling an amount of flux induced in each SQUID.
A method for multiplexed readout of qubits, the method comprising:
- providing a system comprising a plurality of bandpass (BP) filter resonant sections forming a BP filter, each BP filter resonant section being coupled between a different respective point on a read line and a respective qubit of a plurality of qubits through its respective qubit readout resonator of a plurality of qubit readout resonators;
- coupling one more qubits to the read line, while isolating each of the other of the plurality of qubits from the read line;
- providing an input signal to an input port of the read line;
- reading an output signal from an output port of the read line;
- and
- determining the state of the one or more qubits based on the change between the input signal and the output signal.
Dependencies are inferred from the claim text.