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Related Concept Videos

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

Voltage-gated Ion Channels

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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.
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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

G-Protein Gated Ion Channels

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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.
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Global entangling gates on arbitrary ion qubits.

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.

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|July 26, 2019
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Summary
This summary is machine-generated.

Researchers developed a scalable method for global entangling gates using multiple trapped-ion qubits and motional modes. This breakthrough enables efficient universal quantum computation and the creation of complex quantum states.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing

Background:

  • Universal quantum computation relies on entangling gates, but current methods are often inefficient.
  • Global N-qubit entangling gates offer potential speedups but face scalability challenges in trapped-ion systems.
  • Existing multi-mode schemes for trapped ions are scalable but limited to pairwise interactions.

Purpose of the Study:

  • To propose and implement a scalable scheme for global entangling gates on multiple ytterbium-171 ion qubits.
  • To overcome limitations of single-mode and pairwise gate approaches in trapped-ion quantum computing.
  • To demonstrate the flexibility and utility of global gates for building quantum states.

Main Methods:

  • Utilized multiple motional modes in trapped 171-ytterbium ions coupled via modulated laser fields.
  • Developed a system with independent control for each ion to manage multiple modes and coupling strengths.
  • Implemented global entangling gates by carefully decoupling modes and balancing pairwise interactions.

Main Results:

  • Successfully realized scalable global entangling gates on multiple trapped-ion qubits.
  • Demonstrated the generation of a four-qubit Greenberger-Horne-Zeilinger state using a single global operation.
  • Showcased the potential for independent control of ions and multiple motional modes.

Conclusions:

  • The proposed scheme provides scalable global entangling gates as building blocks for universal quantum computation.
  • This work motivates further research into scalable global methods for quantum information processing.
  • The developed technique offers a flexible platform for advancing trapped-ion quantum computing.