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Related Concept Videos

Underflow Gates01:30

Underflow Gates

362
Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and...
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Lossless Lines01:23

Lossless Lines

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In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi, exhibits...
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Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

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Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Deactivation Processes: Jablonski Diagram

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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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Related Experiment Video

Updated: Jan 15, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Active Leakage Cancellation in Single Qubit Gates.

Ben Chiaro1, Yaxing Zhang1

  • 1Google Quantum AI, Santa Barbara, California 93111, USA.

Physical Review Letters
|October 12, 2025
PubMed
Summary

Researchers developed active leakage cancellation to improve quantum gate speed and accuracy. This technique significantly reduces errors in superconducting transmon qubits, paving the way for more robust quantum computers.

Area of Science:

  • Quantum Computing
  • Quantum Information Science
  • Superconducting Circuits

Background:

  • Fast and accurate quantum gates are essential for quantum computation.
  • Physical qubits often have more than two levels, leading to leakage errors with faster gates.

Purpose of the Study:

  • To enhance single-qubit gate performance by reducing leakage errors.
  • To introduce and validate a novel active leakage cancellation technique.

Main Methods:

  • Implemented a second drive tone near leakage transitions to cancel main drive-induced leakage.
  • Developed a measurement sequence for calibrating leakage cancellation parameters.
  • Applied the technique to superconducting transmon qubits.

Main Results:

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  • Achieved up to a 20x reduction in leakage compared to standard derivative removal by adiabatic gate (DRAG) techniques.
  • Demonstrated a coherence-limited gate infidelity of 7.5x10^-5 for a 10 ns pi/2 gate.
  • Reduced leakage to below the 10^-5 level.

Conclusions:

  • Active leakage cancellation is an effective method for suppressing errors in superconducting qubits.
  • The developed technique significantly improves gate fidelity and reduces leakage, advancing quantum computing hardware.
  • This method offers a path towards building more reliable and powerful quantum computers.