Scalable qubit drive and readout

Patent metadata

Field	Value
Publication number	US-9735776-B1
Application number	US-201615275513-A
Country	US
Kind code	B1
Filing date	Sep 26, 2016
Priority date	Sep 26, 2016
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A technique relates to qubit drive and readout. A first lossless microwave switch is connected to a quantum system. A second lossless microwave switch is connectable to the first lossless microwave switch. A quantum-limited amplifier is connectable to the second lossless microwave switch.

First claim

What is claimed is:

1. A system for qubit drive and readout, the system comprising:
a first lossless microwave switch connected to a quantum system;
a second lossless microwave switch connectable to the first lossless microwave switch; and
a quantum-limited amplifier connectable to the second lossless microwave switch.

2. The system of claim 1 , further comprising a circulator configured to connect the first lossless microwave switch to the second lossless microwave switch.

3. The system of claim 2 , wherein the circulator is configured to connect an input to the first lossless microwave switch.

4. The system of claim 1 , wherein the second lossless microwave switch is configured to select between connecting to the quantum-limited amplifier and connecting to a load dump.

5. The system of claim 1 , wherein the quantum system includes a first qubit connected to a first readout resonator at a first port, a second qubit connected to a second readout resonator at a second port, through a last qubit connected to a last readout resonator at a last port, each of the first through the last qubits respectively having a first though a last qubit frequency.

6. A system for qubit drive and readout, the system comprising:
a first lossless microwave switch connected to a quantum system, wherein a first input is connectable to the first lossless microwave switch and a quantum-limited amplifier is connectable to the first lossless microwave switch; and
a second lossless microwave switch connected to the quantum system, wherein a second input is connectable to the second lossless microwave switch, wherein the second input is configured to drive the quantum system and the first input is configured to read out the quantum system.

7. The system of claim 6 , further comprising a first circulator configured to connect the first input to the first lossless microwave switch and configured to connect the quantum-limited amplifier to the first lossless microwave switch.

8. The system of claim 7 , wherein a second circulator is configured to connect the second input to the second lossless microwave switch and connect a load dump to the second lossless microwave switch.

9. The system of claim 6 , wherein the quantum system includes a first qubit connected to a first readout resonator at a first port, a second qubit connected to a second readout resonator at a second port, through a last qubit connected to a last readout resonator at a last port, each of the first through the last qubits respectively having a first though last qubit frequency.

10. The system of claim 9 , wherein the first through the last qubit is driven via the second lossless microwave switch; and
wherein the first through the last readout resonator is read out via the first lossless microwave switch.

Assignees

• IBM

Inventors

• Abdo Baleegh
• Chow Jerry M

Classifications

• H03K17/92 Primary

  by the use, as active elements, of superconductive devices · CPC title

• G06N10/40

  Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control · CPC title