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Read out of quantum states of microwave frequency qubits with optical frequency photons

A qubit and microwave technology, applied in quantum computers, measuring electrical variables, machine learning, etc., can solve problems such as high cost

Active Publication Date: 2019-01-11
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these noise isolation components and microwave signal amplification techniques require significant additional microwave hardware and cost

Method used

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  • Read out of quantum states of microwave frequency qubits with optical frequency photons
  • Read out of quantum states of microwave frequency qubits with optical frequency photons
  • Read out of quantum states of microwave frequency qubits with optical frequency photons

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Embodiment Construction

[0026]Various embodiments are described herein with reference to the associated drawings. Alternative embodiments may be devised without departing from the scope of this document. Note that in the following description and drawings, various connections and positional relationships (eg, above, below, adjacent, etc.) are set forth between elements. Unless otherwise stated, these connections and / or positional relationships may be direct or indirect and are not intended to be limiting in this respect. Therefore, the coupling of entities may refer to direct or indirect coupling, and the positional relationship between entities may be a direct or indirect positional relationship. As an example of an indirect positional relationship, references to forming layer "A" over layer "B" include instances where one or more intervening layers (eg, layer "C") are between layer "A" and layer "B" , as long as the relative properties and functions of layers "A" and "B" are not substantially alt...

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Abstract

Techniques relate to reading a qubit coupled to a microwave resonator.A microwave signal at a microwave resonator frequency is input to the microwave resonator that couples to the qubit. A microwave readout signal from the microwave resonator is output to a microwave to optical converter. The microwave readout signal includes a qubit state of the qubit. The microwave to optical converter is configured to convert the microwave readout signal to an optical signal. In response to the optical signal being output by the microwave to optical converter, it is determined that the qubit is in a predefined qubit state. In response to no optical signal being output by the microwave to optical converter, it is determined that the qubit is not in the predefined qubit state.

Description

technical field [0001] The present invention relates to optoelectronic devices and, more particularly, to the readout of quantum states of microwave frequency quantum bits (qubits) using optical frequency photons. Background technique [0002] In an approach called circuit quantum electrodynamics, quantum computing employs nonlinear superconducting devices called qubits to manipulate and store quantum information at microwave frequencies, as well as resonators (for example, as two-dimensional (2D) planar waveguides) or as a three-dimensional (3D) microwave cavity) to read out and facilitate interactions between qubits. As one example, each superconducting qubit may include one or more Josephson junctions shunted by a capacitor in parallel with the junctions. Qubits are capacitively coupled to 2D or 3D microwave cavities. The electromagnetic energy associated with qubits is stored in Josephson junctions and in the capacitive and inductive elements that form the qubits. [...

Claims

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Application Information

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IPC IPC(8): H04B10/29H04B10/40
CPCG06N10/00G01R29/0885G01R29/0892G06N20/00
Inventor H.白J.S.奥克特L.S.毕晓普J.甘贝塔J.罗森
Owner IBM CORP