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Related Concept Videos

Gain01:15

Gain

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Gain and phase shift are properties of linear circuits that describe the effect a circuit has on a sinusoidal input voltage or current. The circuit's behavior that contains reactive elements will depend on the frequency of the input sinusoid. As a result, it is observed that the gain and phase shift will all be frequency functions.
Gain:
Suppose Vin is the input and Vout is the output signal to a circuit.
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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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In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Processes that involve an increase in entropy of the system (ΔS > 0) are very often spontaneous; however, examples to the contrary are plentiful. By expanding consideration of entropy changes to include the surroundings, a significant conclusion regarding the relation between this property and spontaneity may be reached. In thermodynamic models, the...
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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Gain and loss in open quantum systems.

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  • 1Institute for Quantum Science and Engineering, Texas A&M University, College Station, Texas 77843, USA.

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Summary
This summary is machine-generated.

This study explains the high efficiency of photosynthesis by modeling light-harvesting processes in plants. It reveals a two-step quantum mechanism involving gain-loss dynamics and resonance excitation for efficient energy conversion.

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Area of Science:

  • Quantum biology
  • Photosynthesis research
  • Biophysics

Background:

  • Photosynthesis converts light energy into chemical energy with high efficiency.
  • The precise mechanisms behind this efficiency remain incompletely understood.
  • Understanding quantum effects in biological systems is a growing field.

Purpose of the Study:

  • To elucidate the quantum mechanical principles underlying the high efficiency of photosynthesis.
  • To model the initial light-energy capture and subsequent energy transfer processes.
  • To investigate the role of open quantum systems in biological energy transfer.

Main Methods:

  • Utilizing the formalism of open quantum systems with a non-Hermitian Hamilton operator.
  • Analyzing the interplay of gain (acceptor) and loss (donor) dynamics.
  • Investigating fluctuations near singular points and excitation of resonance states.

Main Results:

  • A rapid, highly efficient initial step driven by gain-loss dynamics and cross-section fluctuations.
  • A slower, second step involving the excitation of resonance states.
  • The overall process demonstrates high efficiency with biexponential decay, mimicking natural light harvesting.

Conclusions:

  • The proposed two-step quantum model provides a framework for understanding photosynthetic efficiency.
  • Fluctuations in open quantum systems can drive rapid and efficient energy transfer.
  • The findings offer insights into optimizing artificial light-harvesting systems.