{"id":21554,"date":"2021-10-16T08:42:29","date_gmt":"2021-10-16T02:57:29","guid":{"rendered":"https:\/\/www.revoscience.com\/en\/?p=21554"},"modified":"2021-10-16T08:45:40","modified_gmt":"2021-10-16T03:00:40","slug":"researchers-propose-quantum-circuit-black-hole-lasers-to-explore-hawking-radiation","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/researchers-propose-quantum-circuit-black-hole-lasers-to-explore-hawking-radiation\/","title":{"rendered":"Researchers propose quantum circuit black hole lasers to explore Hawking radiation"},"content":{"rendered":"\n

The fundamental forces of physics govern the matter comprising the Universe, yet exactly how these forces work together is still not fully understood. The existence of Hawking radiation \u2014 the particle emission from near black holes \u2014 indicates that general relativity and quantum mechanics must cooperate.<\/p>\n\n\n\n

But directly observing Hawking radiation from a black hole is nearly impossible due to the background noise of the Universe, so how can researchers study it to better understand how the forces interact and how they integrate into a \u201cTheory of Everything\u201d?<\/p>\n\n\n\n

According to Haruna Katayama, a doctoral student in Hiroshima University\u2019s\u00a0Graduate School of Advanced Science and Engineering<\/a>, since researchers cannot go to the Hawking radiation, Hawking radiation must be brought to the researchers. She has proposed a quantum circuit that acts as a black hole laser, providing a lab-bench black hole equivalent with advantages over previously proposed versions. The proposal was published on September 27\u00a0Scientific Reports<\/em><\/a>.<\/em><\/p>\n\n\n\n

\"\"
\u00a0PHOTO:<\/strong> Haruna Katayama, Hiroshima University<\/em><\/figcaption><\/figure>\n\n\n\n

\u201cIn this study, we devised a quantum-circuit laser theory using an analogue black hole and a white hole as a resonator,\u201d Katayama said.<\/p>\n\n\n\n

A white hole is a theoretical partner of a black hole that emits light and matter in equal opposition to light and matter a black hole consumes. In the proposed electric circuit, a metamaterial engineered to allow faster-than-light motion spans the space between horizons, near which Hawking radiation is emitted.<\/p>\n\n\n\n

\u201cThe property of superluminal speed is impossible in a normal medium established in an ordinary circuit,\u201d Katayama said. \u201cThe metamaterial element makes it possible for Hawking radiation to travel back and forth between horizons, and the Josephson effect \u2014 which describes a continuous flow of current that propagates without voltage \u2014 plays an important role in amplifying the Hawking radiation through the mode conversion at the horizons, mimicking the behavior between the white and black holes.\u201d<\/p>\n\n\n\n

Katayama\u2019s proposal builds on previously proposed optical black hole lasers by introducing the metamaterial that allows for superluminal speed and exploiting the Josephson effect to amplify the Hawking radiation. The resulting quantum circuit induces a soliton, a localized, self-reinforcing waveform that maintains speed and shape until external factors collapse the system.  <\/p>\n\n\n\n

\u201cUnlike previously proposed black hole lasers, our version has a black hole\/white hole cavity formed within a single soliton, where Hawking radiation is emitted outside of the soliton so we can evaluate it,\u201d Katayama said.<\/p>\n\n\n\n

Hawking radiation is produced as entangled particle pairs, with one inside and one outside the horizon. According to Katayama, the observable entangled particle bears the shadow of its partner particle. As such, the quantum correlation between the two particles can be determined mathematically without the simultaneous observation of both particles.<\/p>\n\n\n\n

\u201cThe detection of this entanglement is indispensable for the confirmation of Hawking radiation,\u201d Katayama said.<\/p>\n\n\n\n

However, Katayama cautioned, the lab Hawking radiation differs from true black hole Hawking radiation due to the normal dispersion of light in the proposed system. The components of light split in one direction, like in a rainbow. If the components can be controlled so that some can reverse and bounce back, the resulting lab-made Hawking radiation would mirror the same positive frequency of true black hole Hawking radiation. She is now investigating how to integrate anomalous dispersion to achieve a more comparable result.<\/p>\n\n\n\n

\u201cIn the future, we would like to develop this system for quantum communication between distinct spacetimes using Hawking radiation,\u201d Katayama said, noting the system\u2019s scalability and controllability as advantages in developing quantum technologies.<\/p>\n\n\n\n

The Japan Society for the Promotion of Science supported this research.<\/p>\n","protected":false},"excerpt":{"rendered":"

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