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Related Concept Videos

State Space to Transfer Function01:21

State Space to Transfer Function

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The conversion of state-space representation to a transfer function is a fundamental process in system analysis. It provides a method for transitioning from a time-domain description to a frequency-domain representation, which is crucial for simplifying the analysis and design of control systems.
The transformation process begins with the state-space representation, characterized by the state equation and the output equation. These equations are typically represented as:
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State Space Representation01:27

State Space Representation

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The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Robust Multiple-Range Coherent Quantum State Transfer.

Bing Chen1,2, Yan-Dong Peng1, Yong Li2

  • 1College of Electronics, Communication &Physics, Shandong University of Science and Technology, Qingdao 266510, China.

Scientific Reports
|July 2, 2016
PubMed
Summary
This summary is machine-generated.

We developed a quantum communication channel for high-fidelity, two-way quantum state transport. This method uses adiabatic coupling to a data bus, creating a dark state for controlled information exchange, robust against noise.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Systems
  • Solid-State Quantum Devices

Background:

  • Coherent quantum state transport is crucial for quantum networks.
  • Existing methods face challenges with fidelity and noise resilience.
  • Efficient two-way communication protocols are needed.

Purpose of the Study:

  • To propose a novel quantum communication channel for high-fidelity, two-way quantum state transport.
  • To enable controlled information exchange between remote qubits.
  • To demonstrate robustness against system imperfections and environmental noise.

Main Methods:

  • Utilizing a multiple-range quantum communication channel.
  • Employing adiabatic coupling of qubits to an N-site tight-binding chain with a central defect.
  • Leveraging a three-level system and a dark state for controlled state transfer.
  • Performing numerical simulations to assess performance and robustness.

Main Results:

  • Achieved coherent two-way quantum state transport with high fidelity.
  • Demonstrated controllable information exchange timing via a dark state.
  • Showcased robustness against perturbative defects in the data bus.
  • Confirmed efficiency in the presence of environmental dephasing noise.

Conclusions:

  • The proposed scheme offers a robust and efficient method for quantum state transport.
  • The dark state mechanism provides precise control over information exchange.
  • This approach is promising for building reliable quantum communication networks.