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Non-gated Ion Channels01:24

Non-gated Ion Channels

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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
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Ligand-gated Ion Channels01:19

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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
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Voltage-gated Ion Channels01:26

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Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
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Mechanically-gated Ion Channels01:12

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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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G-Protein Gated Ion Channels01:21

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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
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Molecular Entanglement and Electrospinnability of Biopolymers
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Puertas de entrelazamiento global en qubits de iones arbitrarios

Yao Lu1, Shuaining Zhang2, Kuan Zhang2,3

  • 1Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing, China. yao-lu14@mails.tsinghua.edu.cn.

Nature
|July 26, 2019
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un método escalable para las puertas de entrelazamiento global utilizando múltiples qubits de iones atrapados y modos de movimiento. Este avance permite una eficiente computación cuántica universal y la creación de estados cuánticos complejos.

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Área de la Ciencia:

  • Ciencia de la información cuántica
  • Física atómica
  • La computación cuántica

Sus antecedentes:

  • La computación cuántica universal se basa en puertas entrelazadas, pero los métodos actuales a menudo son ineficientes.
  • Las puertas globales de entrelazamiento de N-qubit ofrecen potenciales aceleraciones, pero enfrentan desafíos de escalabilidad en sistemas de iones atrapados.
  • Los esquemas multimodales existentes para iones atrapados son escalables pero limitados a las interacciones en pares.

Objetivo del estudio:

  • Proponer e implementar un esquema escalable para puertas de entrelazamiento global en múltiples qubits de iones de iterbio-171.
  • Para superar las limitaciones de los enfoques de puerta de modo único y en pares en la computación cuántica de iones atrapados.
  • Para demostrar la flexibilidad y utilidad de las puertas globales para la construcción de estados cuánticos.

Principales métodos:

  • Utilizó múltiples modos de movimiento en iones atrapados de 171-ytterbium acoplados a través de campos láser modulados.
  • Desarrolló un sistema con control independiente para cada ion para administrar múltiples modos y fuerzas de acoplamiento.
  • Implementó puertas de entrelazamiento global desacoplando cuidadosamente los modos y equilibrando las interacciones en pares.

Principales resultados:

  • Realizó con éxito puertas de enredo globales escalables en múltiples qubits de iones atrapados.
  • Demostró la generación de un estado Greenberger-Horne-Zeilinger de cuatro qubits utilizando una sola operación global.
  • Mostró el potencial para el control independiente de iones y múltiples modos de movimiento.

Conclusiones:

  • El esquema propuesto proporciona puertas de entrelazamiento globales escalables como bloques de construcción para la computación cuántica universal.
  • Este trabajo motiva una mayor investigación en métodos globales escalables para el procesamiento de información cuántica.
  • La técnica desarrollada ofrece una plataforma flexible para avanzar en la computación cuántica de iones atrapados.