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Related Concept Videos

The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Related Experiment Video

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Isotopically enhanced triple-quantum-dot qubit.

Kevin Eng1, Thaddeus D Ladd1, Aaron Smith1

  • 1HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, CA 90265, USA.

Science Advances
|November 25, 2015
PubMed
Summary
This summary is machine-generated.

Future quantum information processors can use silicon spin qubits with all-electrical control. This study demonstrates universal coherent control of a triple-quantum-dot qubit in silicon, enabling complex quantum logic operations.

Keywords:
Qubitsisotopically enhanced semiconductorsquantum controlquantum dotsquantum informationsemiconductor heterostructures

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Area of Science:

  • Quantum computing
  • Semiconductor spintronics
  • Solid-state quantum information

Background:

  • Future quantum information processors may utilize all-electrical control of silicon-based devices.
  • Semiconductor spin qubits offer a path to control quantum information without magnetic fields.
  • Gallium arsenide (GaAs) triple dots suffer from nuclear magnetic noise, unlike isotopically purified silicon.

Purpose of the Study:

  • To demonstrate universal coherent control of a triple-quantum-dot qubit in an isotopically enhanced silicon-based heterostructure.
  • To assess the feasibility of all-electrical control for silicon spin qubits.
  • To enable long pulse sequences for advanced quantum computing protocols.

Main Methods:

  • Implementation of a triple-quantum-dot qubit using three electrons in tunnel-coupled quantum dots within a Si/SiGe heterostructure.
  • Application of composite pulses for spin-echo sequences to achieve coherent control.
  • Utilization of differential charge sensing for single-shot qubit state readout.

Main Results:

  • Demonstration of universal coherent control over a triple-quantum-dot qubit in isotopically enhanced silicon.
  • Successful implementation of spin-echo sequences and single-shot readout.
  • Attainment of sufficient control fidelity and low noise levels for complex quantum operations.

Conclusions:

  • Isotopically purified silicon is a viable material for reducing noise in spin qubits.
  • The demonstrated control methods are sufficient for advanced quantum computing tasks like exchange-only two-qubit logic and randomized benchmarking.
  • All-electrical control of silicon spin qubits is a promising avenue for scalable quantum information processing.