Quantum bit array circuit, quantum computer, and method for reading quantum bit
The quantum bit array circuit and readout method convert spin information into electron number differences using Pauli spin blockade and classical charge manipulation, enhancing signal strength and noise resistance in quantum computing.
WO2025253481A1 Publication Date: 2025-12-11HITACHI LTD
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Patent Information
- Application Number
- PCT/JP2024/020318
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-12-11
AI Technical Summary
Technical Problem
Existing quantum computing technologies face challenges in detecting the spin direction of electrons without generating a reference current, leading to low signal strength and vulnerability to external noise.
Method used
A quantum bit array circuit and readout method that converts spin information into the number of electrons in two quantum dots, using Pauli spin blockade and classical charge manipulation to determine the spin state, enabling differential readout with increased signal strength and noise robustness.
Benefits of technology
The method eliminates the need for a reference current, doubles the signal amount, and provides robust readout against external noise, facilitating efficient quantum computing.
✦ Generated by Eureka AI based on patent content.
Abstract
The problem to be solved by the present invention is to provide a reading method which eliminates the need for generating a reference current when detecting the number of electrons corresponding to the direction of spin of one electron, and which increases a signal amount and is robust against disturbance noise. One preferred aspect of the present invention is a quantum bit array circuit comprising a quantum bit array unit and a sense amplifier unit. The quantum bit array unit includes a spin charge conversion part having a first quantum bit transistor and a second quantum bit transistor for reading a quantum bit state, and a third quantum bit transistor for supplying electrons to the first quantum bit transistor. The sense amplifier unit includes a first output transistor and a second output transistor for outputting current according to the number of electrons. The first quantum bit transistor and the second quantum bit transistor are connected via an electron movement pathway. The first quantum bit transistor and the second quantum bit transistor are electrically connected or capacitively coupled to the first output transistor and the second output transistor, respectively. A barrier transistor having a gate electrode for applying voltage for executing a Pauli spin blockade and voltage for executing a classical charge operation is provided between the first quantum bit transistor and the second quantum bit transistor.
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