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Related Concept Videos

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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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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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...
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Lattice Centering and Coordination Number02:33

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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To determine the electron configuration for any particular atom, we can build the structures in the order of atomic numbers. Beginning with hydrogen, and continuing across the periods of the periodic table, we add one proton at a time to the nucleus and one electron to the proper subshell until we have described the electron configurations of all the elements. This procedure is called the aufbau principle, from the German word aufbau (“to build up”). Each added electron occupies the...
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Location Qubits in a Multiple-Quantum-Dot System.

Dayang Li1, Rohan Radhakrishnan1, Nika Akopian1

  • 1DTU Department of Electrical and Photonics Engineering, Technical University of Denmark, Ørsteds Plads Building 343, 2800 Kongens Lyngby, Denmark.

Nano Letters
|April 24, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a quantum dot platform for the quantum internet. This novel system uses location qubits and all-optical gates, demonstrating high fidelity and robustness against decoherence.

Keywords:
Optically active nanowire quantum dotsadiabatic Raman techniquecrystal-phase quantum structurelocation qubitoptical quantum control

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Area of Science:

  • Quantum computing
  • Solid-state physics
  • Quantum communication

Background:

  • The development of a physical platform for quantum internet nodes is a significant challenge.
  • Existing quantum information processing schemes often involve complex experimental setups.

Purpose of the Study:

  • To propose a novel physical platform for quantum internet nodes.
  • To introduce a simple and experimentally feasible quantum information processing scheme.
  • To demonstrate the viability of location qubits and all-optical quantum gates.

Main Methods:

  • Utilized a system of multiple crystal-phase quantum dots.
  • Introduced and defined novel location qubits.
  • Developed a method for constructing a universal set of all-optical quantum gates.
  • Simulated gate performance in realistic structures, incorporating decoherence sources.

Main Results:

  • Location qubits demonstrated robustness against major decoherence mechanisms.
  • Simulated single-qubit gate fidelities exceeded 99.9% in realistic scenarios.
  • The proposed scheme is conceptually simple and experimentally uncomplicated.

Conclusions:

  • The developed quantum dot platform provides a clear path towards building multiqubit solid-state quantum registers.
  • This platform features an integrated photonic interface, crucial for the quantum internet.
  • The findings represent a key building block for the future quantum internet.