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Related Concept Videos

Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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. Schrödinger...
BIBO stability of continuous and discrete -time systems01:24

BIBO stability of continuous and discrete -time systems

System stability is a fundamental concept in signal processing, often assessed using convolution. For a system to be considered bounded-input bounded-output (BIBO) stable, any bounded input signal must produce a bounded output signal. A bounded input signal is one where the modulus does not exceed a certain constant at any point in time.
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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

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Published on: November 1, 2013

Coherence-protected quantum gate by continuous dynamical decoupling in diamond.

Xiangkun Xu1, Zixiang Wang, Changkui Duan

  • 1Hefei National Laboratory for Physics Sciences at Microscale, University of Science and Technology of China, China.

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

Researchers protected quantum gates and qubits from decoherence using continuous-wave dynamical decoupling. This method extended coherence times by 20 times, enabling reliable quantum information processing.

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Area of Science:

  • Quantum information science
  • Quantum computing hardware

Background:

  • Quantum information processing relies on maintaining qubit coherence.
  • Decoherence degrades quantum states, limiting the reliability of quantum computations.
  • Protecting quantum gates is crucial for executing complex quantum algorithms.

Purpose of the Study:

  • To experimentally demonstrate a method for protecting qubits and quantum gates from decoherence.
  • To investigate the effectiveness of continuous-wave dynamical decoupling in enhancing coherence times.
  • To assess the compatibility of this protocol with quantum logic operations.

Main Methods:

  • Utilized a nitrogen-vacancy (NV) center system for experimental demonstration.
  • Applied a continuous-wave dynamical decoupling technique.
  • Measured the impact on coherence time and quantum gate fidelity.

Main Results:

  • Achieved an approximately 20-fold prolongation of coherence time.
  • Demonstrated protection of quantum gates during the control time.
  • The protocol effectively preserves coherence for extended quantum control durations.

Conclusions:

  • Continuous-wave dynamical decoupling is a viable method for robust quantum information processing.
  • This technique enhances coherence times and protects quantum gates, crucial for quantum computing.
  • The protocol is suitable for applications where quantum control times exceed dephasing times.