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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

10.8K
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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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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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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Using Optical Tweezers for the Generation of Hybrid Spheroids
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Using Optical Tweezers for the Generation of Hybrid Spheroids

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Optical Tweezer-Controlled Entanglement Gates with Trapped-Ion Qubits.

David Schwerdt1,2, Lee Peleg1,2, Gal Dekel1

  • 1Weizmann Institute of Science, Department of Physics of Complex Systems, Rehovot 7610001, Israel.

Physical Review Letters
|January 30, 2026
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We demonstrate a new quantum entanglement protocol using ions and optical tweezers for quantum computing. This method enables efficient implementation of complex quantum gates, advancing scalable quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Atomic, Molecular, and Optical (AMO) Physics
  • Quantum Computing

Background:

  • Quantum entanglement is crucial for quantum computation.
  • Implementing controlled quantum operations is a key challenge.
  • Ions manipulated by optical tweezers offer a promising platform for qubits.

Purpose of the Study:

  • To propose and experimentally demonstrate a novel entanglement protocol.
  • To utilize ions illuminated by optical tweezers as control qubits.
  • To implement a controlled Mölmer-Sörensen operation analogous to a Toffoli gate.

Main Methods:

  • Experimental demonstration using a three-ion chain.
  • Employing optical tweezers to control ion qubits.
  • Performing a controlled Mölmer-Sörensen gate operation.

Main Results:

  • Successful demonstration of the proposed entanglement protocol.
  • Observation of controlled operations on a three-ion system.
  • Analysis of dephasing effects on control qubits due to laser intensity fluctuations.

Conclusions:

  • The protocol is experimentally validated on a three-ion chain.
  • The method shows potential for implementing n-controlled unitary operations.
  • Generalizability to larger qubit systems and broader classes of operations is discussed.