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Method and arrangement for reading out the state of a qubit

A qubit and state technology, applied in the field of quantum computing, can solve problems such as unfavorable states of qubits

Pending Publication Date: 2020-04-17
IQM FINLAND OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The long delay in reading out the state of a qubit with reasonable reliability is disadvantageous because it sets a limit on the speed at which quantum computations can be performed where the state must be read

Method used

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  • Method and arrangement for reading out the state of a qubit
  • Method and arrangement for reading out the state of a qubit

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Embodiment Construction

[0042] Figure 4 is a schematic diagram of the principle of a device for reading out the state of a qubit. The device comprises an information storage element 101 for storing the states of the qubits. The two horizontal lines in the diagram mark the two possible ground states that a qubit can have. In the technical field of hardware devices for quantum computing, it is customary to use the term qubit not only for the conceptual basic information unit but also for the hardware constituting the information storage element 101 .

[0043] The device also includes a readout resonator 102 that is electromagnetically coupled to the information storage element or qubit 101 . The readout resonator 102 is a harmonic oscillator and it has a certain resonant frequency. The strength of the electromagnetic coupling between the resonator 102 and the information storage element (or qubit) 101 can be described by the coupling coefficient g. For ease of reference, the qubit 101 and its reado...

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Abstract

For reading out the state of a qubit there is injected(1602) a readout input waveform into a system that comprises an information storage element (101) for storing the state of the qubit and a readoutresonator (102) that is electromagnetically coupled to said information storage element(101). A readout output waveform is extracted from said system and detected (1102). Said injecting (1602) of thereadout input waveform takes place through an excitation port (103) that is also used to inject excitation waveforms to the information storage element (101) for affecting the state of the qubit. A phase of the readout input waveform is controllably shifted (1604) in the course of injecting it into the system.

Description

technical field [0001] The present invention generally relates to quantum computing technology. In particular, the invention relates to techniques for reading out the state of quantum bits (qubits) in a fast and reliable manner. Background technique [0002] In quantum computing, it has become common to use the term "qubit" to designate not only the basic information unit but also the information storage element used to store one qubit of information. As an example, a superconducting memory circuit with one or more qubits (ie, qubit-sized information storage elements) may be considered. In such examples, the qubit is an anharmonic oscillator, such as a transmon, and it can be coupled to a nearby readout resonator to facilitate reading out the state of the qubit stored therein. [0003] FIG. 1 is a schematic diagram of an example of a memory circuit comprising four qubits (ie, four qubit-sized information storage elements). The upper left qubit 101 and its associated micro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06N10/00H10N69/00
CPCH03H5/00B82Y10/00G06K7/10009H01P7/086H10N60/12G06N10/40H03K19/164
Inventor M·莫托宁J·伊科宁J·哥茨
Owner IQM FINLAND OY