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Entropy02:39

Entropy

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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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Entropy Change in Reversible Processes01:10

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In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
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¹H NMR: Long-Range Coupling01:27

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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.
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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Long-term Potentiation01:35

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Standard Entropy Change for a Reaction03:00

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Entropy is a state function, so the standard entropy change for a chemical reaction (ΔS°rxn) can be calculated from the difference in standard entropy between the products and the reactants.
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Scalable Creation of Long-Lived Multipartite Entanglement.

H Kaufmann1, T Ruster1, C T Schmiegelow1

  • 1Institut für Physik, Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany.

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|October 28, 2017
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Researchers deterministically created multipartite entanglement using scalable methods with four qubits in calcium ions (Ca+). This breakthrough advances quantum computing by generating complex entangled states with high fidelity and coherence.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing

Background:

  • Multipartite entanglement is crucial for quantum computing and quantum communication.
  • Scalable generation of entangled states remains a significant challenge in quantum technology.

Purpose of the Study:

  • To demonstrate a scalable method for deterministic generation of multipartite entanglement.
  • To create and characterize a four-qubit entangled state using trapped ions.

Main Methods:

  • Utilizing four ^{40}Ca+ ions as qubits in a microstructured segmented Paul trap.
  • Employing laser-driven pairwise gate operations for sequential entanglement.
  • Implementing dynamic ion shuttling for qubit reconfiguration and interaction management.

Main Results:

  • Successfully generated a four-ion Greenberger-Horne-Zeilinger (GHZ) state with high fidelity (94.4(3)%).
  • Achieved 69(5)% coherence for the entangled state at 1.1 seconds storage time using dynamic decoupling.

Conclusions:

  • The demonstrated scalable method enables deterministic generation of complex multipartite entangled states.
  • The results show significant progress towards robust quantum information processing with trapped ions.