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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Improving a Solid-State Qubit through an Engineered Mesoscopic Environment.

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This summary is machine-generated.

Researchers used quantum feedback to reduce the entropy of nuclear spins in a quantum dot. This improved electron spin qubit coherence, extending its dephasing time by tenfold.

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Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Quantum Computing

Background:

  • Controlled quantum systems can modify their environment via feedback mechanisms.
  • Feedback can lead to reduced-entropy states and enhanced system coherence.
  • Quantum dots offer a platform for studying quantum phenomena with electron and nuclear spins.

Purpose of the Study:

  • To prepare quantum-dot nuclei into a reduced-entropy state using feedback.
  • To investigate the effect of this state preparation on electron spin qubit coherence.
  • To measure nuclear spin correlations and their impact on qubit dephasing.

Main Methods:

  • Utilized a quantum-dot electron spin as a control and probe.
  • Employed coherent population trapping feedback to manipulate nuclear spins.
  • Performed Ramsey interferometry on the electron spin to analyze nuclear distribution and correlations.

Main Results:

  • Observed the evolution of quantum-dot nuclei from a thermal to a reduced-entropy state.
  • Demonstrated a significant extension of electron qubit coherence.
  • Achieved an order-of-magnitude increase in the electron spin inhomogeneous dephasing time (T_{2}*) to 39 ns under optimal feedback.

Conclusions:

  • Feedback control of nuclear spins can effectively reduce environmental entropy and enhance qubit coherence.
  • The study provides direct measurement of nuclear spin correlations and their decay.
  • Results are applicable to quantum information protocols and advancing quantum many-body states in nuclear spin ensembles.