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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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Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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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 Channels01:19

Ligand-gated Ion Channels

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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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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.
Sensory...
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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Fast quantum logic gates with trapped-ion qubits.

V M Schäfer1, C J Ballance1, K Thirumalai1

  • 1Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK.

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This summary is machine-generated.

Researchers developed a new method for fast quantum logic using trapped ions. This technique significantly speeds up entanglement generation, achieving high fidelity and robustness against errors, paving the way for advanced quantum computers.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing Hardware

Background:

  • Trapped atomic ions are a leading platform for quantum computing due to their long coherence times and high-fidelity operations.
  • Current two-qubit gates for generating quantum entanglement in trapped ions are limited to ~10 kHz speeds due to adiabatic operation requirements.
  • Faster gate operations are crucial for scaling quantum computers and overcoming decoherence.

Purpose of the Study:

  • To implement a novel method for achieving fast, high-fidelity two-qubit gates in trapped-ion systems.
  • To demonstrate entanglement generation at speeds significantly exceeding the conventional adiabatic limit.
  • To enhance the robustness of quantum logic operations against experimental noise, particularly optical phase fluctuations.

Main Methods:

  • Utilized amplitude-shaped laser pulses to precisely control ion motion along specific trajectories.
  • Designed gate operations to be insensitive to the optical phase of the driving laser pulses.
  • Implemented a single amplitude-shaped pulse and a pair of continuous-wave laser beams for gate execution.

Main Results:

  • Achieved megahertz-rate quantum logic, enabling entanglement generation in as little as 480 nanoseconds.
  • Demonstrated a 1.6-microsecond gate with 99.8% fidelity, over ten times lower error rate than conventional methods.
  • The method shows potential for even faster gates with increased laser intensity, while maintaining high fidelity.

Conclusions:

  • The developed technique offers a pathway to submicrosecond quantum logic speeds for trapped-ion qubits.
  • This approach combines the strengths of trapped ions (coherence, fidelity) with the speed typically seen in solid-state systems.
  • The method promises to accelerate the development of scalable and fault-tolerant quantum computers.