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Related Concept Videos

Free Energy Changes for Nonstandard States03:25

Free Energy Changes for Nonstandard States

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The free energy change for a process taking place with reactants and products present under nonstandard conditions (pressures other than 1 bar; concentrations other than 1 M) is related to the standard free energy change according to this equation:
 
where R is the gas constant (8.314 J/K·mol), T is the absolute temperature in kelvin, and Q is the reaction quotient. This equation may be used to predict the spontaneity of a process under any given set of conditions.
Reaction Quotient...
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Carrier Generation and Recombination01:22

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Path Between Thermodynamics States01:21

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Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
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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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Related Experiment Video

Updated: May 21, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Parity-dependent state transfer for direct entanglement generation.

F A Roy1,2, J H Romeiro3,4, L Koch5,6

  • 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany. federico.roy@wmi.badw.de.

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|March 19, 2025
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Summary

Perfect State Transfer allows fast, long-range qubit communication using only local connections. This method also enables efficient multi-qubit entanglement generation, crucial for quantum computing advancements.

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Last Updated: May 21, 2025

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Area of Science:

  • Quantum Information Science
  • Superconducting Quantum Computing
  • Quantum Entanglement

Background:

  • Scaling quantum computers requires improved qubit connectivity and efficient entanglement generation.
  • Existing methods face limitations in achieving long-range qubit interactions and high-fidelity entanglement.
  • Perfect State Transfer (PST) offers a potential solution for time-optimal state transfer using nearest-neighbor couplings.

Purpose of the Study:

  • To experimentally demonstrate Perfect State Transfer on a superconducting quantum processor.
  • To explore the application of PST for generating multi-qubit entanglement.
  • To investigate the parity-dependent nature of the PST protocol for quantum information processing.

Main Methods:

  • Utilized a chain of six superconducting transmon qubits with tunable couplers.
  • Employed parametric drives to control and simultaneously activate all nearest-neighbor couplings.
  • Implemented and verified single-excitation dynamics and parity-dependent multi-excitation dynamics.

Main Results:

  • Successfully demonstrated Perfect State Transfer for up to six qubits, confirming time-optimal dynamics.
  • Verified the parity-dependent phase accumulation in the transferred state for multiple excitations.
  • Prepared a Greenberger-Horne-Zeilinger (GHZ) state using a single PST operation.

Conclusions:

  • Perfect State Transfer is a viable technique for enhancing connectivity in superconducting quantum processors.
  • The parity-dependent interactions inherent in PST are effective for generating multi-qubit entanglement.
  • PST presents a promising pathway for efficient and scalable quantum information processing and entanglement generation.