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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.
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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.
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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.
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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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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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Robust 2-Qubit Gates in a Linear Ion Crystal Using a Frequency-Modulated Driving Force.

Pak Hong Leung1, Kevin A Landsman2, Caroline Figgatt2

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We developed a frequency-modulated driving force to improve entanglement in ion trap quantum computers. This method significantly reduces errors in two-qubit gates, achieving high fidelity even with multiple ions.

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Area of Science:

  • Quantum computing
  • Atomic physics
  • Quantum information science

Background:

  • Ion trap quantum computers utilize collective motional modes for qubit entanglement.
  • Errors arise from residual entanglement between ion internal and motional states, particularly with spectator ions.

Purpose of the Study:

  • To propose and validate a frequency-modulated driving force to minimize errors in multiqubit gates.
  • To enhance the fidelity of two-qubit gates in ion trap systems.

Main Methods:

  • Simulations of an optimized frequency-modulated driving force for two-qubit gates.
  • Experimental implementation and fidelity measurement of the proposed gate in a five-ion system.

Main Results:

  • Simulations show error suppression below 0.01% with robustness against frequency drifts (±1 kHz).
  • Experimental two-qubit gate fidelity reached 98.3(4)%, a state-of-the-art result for five ions.

Conclusions:

  • Frequency-modulated driving force is an effective technique to reduce errors in ion trap quantum computing.
  • This method offers a promising path towards high-fidelity multiqubit gates in scalable quantum processors.