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Updated: Oct 18, 2025
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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
Published on: April 24, 2014
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Quantum-circuit black hole lasers.
1Graduate School of Advanced Science and Engineering, Hiroshima University, Higashihiroshima, 739-8521, Japan. halna496@gmail.com.
Scientific Reports
|September 28, 2021
Summary
Researchers developed a novel black hole laser using Josephson transmission lines. This system amplifies Hawking radiation, making it observable and demonstrating quantum correlations via entanglement entropy.
Area of Science:
- Quantum optics
- Analog gravity
- Condensed matter physics
Background:
- Hawking radiation from black holes is theoretically significant but experimentally elusive.
- Previous proposals for analog black hole lasers have not progressed in electric circuit systems.
- Electric circuits offer advantages for high-precision electromagnetic wave detection.
Purpose of the Study:
- To propose and analyze a novel black hole laser system using Josephson transmission lines.
- To demonstrate the generation and observability of amplified Hawking radiation in an analog system.
- To investigate quantum correlations in the generated Hawking radiation.
Main Methods:
- Utilizing Josephson transmission lines with metamaterial elements to create Hawking-pair propagation modes.
- Employing a dark soliton in the nonlinear Schrödinger equation to form a black hole-white hole horizon pair acting as a laser cavity.
- Leveraging Kerr nonlinearity from Josephson inductance to modify the refractive index.
- Calculating squeezing parameters for the laser output and entanglement entropy to quantify quantum correlations.
Main Results:
- Successfully proposed a black hole laser system in Josephson transmission lines.
- Demonstrated the formation of a black hole-white hole horizon pair and a squeezed-state laser.
- Quantified quantum correlations between Hawking and partner radiations using entanglement entropy.
- Showed that entanglement entropy depends on soliton velocity, providing evidence for quantum correlation from pair production.
Conclusions:
- The proposed Josephson transmission line system offers a viable platform for analog black hole lasers.
- The generated radiation exhibits characteristics of Hawking radiation with measurable quantum correlations.
- This work opens new avenues for experimental investigation of quantum phenomena in analog gravity systems.
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