Method and arrangement for reading out the state of a qubit
AssigneeIQM Finland Oy
InventorsMikko Möttönen, Joni Ikonen, Jan Goetz
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Abstract
For reading out a state of a qubit, a readout input waveform is injected into a system that comprises an information storage element for storing the state of the qubit and a readout resonator that is electromagnetically coupled to said information storage element. A readout output waveform is extracted from said system and detected. The injection of the readout input waveform takes place through an excitation port that is also used to inject excitation waveforms to the information storage element for affecting the state of the qubit. A phase of the readout input waveform is controllably shifted in the course of injecting it into the system.
Claims13
An arrangement for reading out a state of a qubit, the arrangement comprising:
- an information storage element for storing the state of the qubit;
- a readout resonator electromagnetically coupled to said information storage element;
- an excitation port for injecting excitation waveforms to the information storage element for affecting the state of the qubit;
- one or more readout ports for injecting readout input waveforms to a system comprising said information storage element and said readout resonator, and for extracting readout output waveforms from the system;
- a readout waveform source for generating said readout input waveforms;
- and
- a readout waveform detector for detecting said readout output waveforms;
- wherein said readout waveform source is configured to inject said readout input waveforms into the system simultaneously both through said excitation port and through a first readout port of said one or more readout ports, said first readout port being different than said excitation port, and
- wherein said readout waveform source is configured to controllably shift a phase of a readout input waveform in the course of injecting it into the system.
A method for reading out a state of a qubit, the method comprising:
- injecting a readout input waveform into a system that comprises an information storage element for storing the state of the qubit and a readout resonator that is electromagnetically coupled to said information storage element;
- and
- detecting a readout output waveform extracted from said system,
- wherein said injecting of the readout input waveform takes place through an excitation port that is also used to inject excitation waveforms to the information storage element for affecting the state of the qubit, and simultaneously through a first readout port that is different than said excitation port, and
- wherein a phase of the readout input waveform is controllably shifted in the course of injecting it into the system.
Dependencies are inferred from the claim text.