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Updated: Mar 25, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Extracting Information about the Initial State from the Black Hole Radiation
Kinjalk Lochan1, T Padmanabhan1
1IUCAA, Post Bag 4, Ganeshkhind, Pune University Campus, Pune 411 007, India.
The black hole information paradox arises because initial quantum state information seems lost. This study shows that distortions in black hole radiation can reveal and reconstruct some of this lost quantum information.
Area of Science:
- Quantum gravity
- Black hole physics
- Information theory
Background:
- The black hole information paradox questions information loss during black hole evaporation.
- Unitary quantum theory predicts information should be preserved.
Purpose of the Study:
- Investigate imprints of initial quantum states in black hole radiation distortions.
- Identify reconstructible quantum states from radiation.
Main Methods:
- Analysis of distortions in black hole radiation.
- Theoretical study of quantum state reconstruction.
Main Results:
- Specific distortions in black hole radiation contain information about the initial quantum state.
- Partial or full reconstruction of certain initial states is possible from radiation.
- Even general initial states yield some recoverable information.
Conclusions:
- Classical collapse models overlook significant information in black hole radiation.
- A consistent quantum treatment of black hole formation may recover more information from the final radiation spectrum.
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