An Improved Bound on Nonlinear Quantum Mechanics using a Cryogenic Radio Frequency Experiment
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866915407076524032 |
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| author | Melnychuk, Oleksandr Giaccone, Bianca Bornman, Nicholas Cervantes, Raphael Grassellino, Anna Harnik, Roni Kaplan, David E. Nahal, Geev Pilipenko, Roman Posen, Sam Rajendran, Surjeet Sushkov, Alexander O. |
| author_facet | Melnychuk, Oleksandr Giaccone, Bianca Bornman, Nicholas Cervantes, Raphael Grassellino, Anna Harnik, Roni Kaplan, David E. Nahal, Geev Pilipenko, Roman Posen, Sam Rajendran, Surjeet Sushkov, Alexander O. |
| contents | There are strong arguments that quantum mechanics may be nonlinear in its dynamics. A discovery of nonlinearity would hint at a novel understanding of the interplay between gravity and quantum field theory, for example. As such, experiments searching for potential nonlinear effects in the electromagnetic sector are important. Here we outline such an experiment, consisting of a stream of random bits (which were generated using Rigetti's Aspen-M-3 chip) as input to an RF signal generator coupled to a cryogenic detector. Projective measurements of the qubit state, which is originally prepared in an equal superposition, serve as the random binary output of a signal generator. Thereafter, spectral analysis of the RF detector would yield a detectable excess signal predicted to arise from such a nonlinear effect. A comparison between the projective measurements of the quantum bits vs the classical baseline showed no power excess. This sets a new limit on the electromagnetic nonlinearity parameter $|ε| \lessapprox 1.15 \times 10^{-12}$, at a 90.0% confidence level. This is the most stringent limit on nonlinear quantum mechanics thus far and an improvement by nearly a factor of 50 over the previous experimental limit. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_09611 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | An Improved Bound on Nonlinear Quantum Mechanics using a Cryogenic Radio Frequency Experiment Melnychuk, Oleksandr Giaccone, Bianca Bornman, Nicholas Cervantes, Raphael Grassellino, Anna Harnik, Roni Kaplan, David E. Nahal, Geev Pilipenko, Roman Posen, Sam Rajendran, Surjeet Sushkov, Alexander O. Quantum Physics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology Instrumentation and Detectors There are strong arguments that quantum mechanics may be nonlinear in its dynamics. A discovery of nonlinearity would hint at a novel understanding of the interplay between gravity and quantum field theory, for example. As such, experiments searching for potential nonlinear effects in the electromagnetic sector are important. Here we outline such an experiment, consisting of a stream of random bits (which were generated using Rigetti's Aspen-M-3 chip) as input to an RF signal generator coupled to a cryogenic detector. Projective measurements of the qubit state, which is originally prepared in an equal superposition, serve as the random binary output of a signal generator. Thereafter, spectral analysis of the RF detector would yield a detectable excess signal predicted to arise from such a nonlinear effect. A comparison between the projective measurements of the quantum bits vs the classical baseline showed no power excess. This sets a new limit on the electromagnetic nonlinearity parameter $|ε| \lessapprox 1.15 \times 10^{-12}$, at a 90.0% confidence level. This is the most stringent limit on nonlinear quantum mechanics thus far and an improvement by nearly a factor of 50 over the previous experimental limit. |
| title | An Improved Bound on Nonlinear Quantum Mechanics using a Cryogenic Radio Frequency Experiment |
| topic | Quantum Physics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology Instrumentation and Detectors |
| url | https://arxiv.org/abs/2411.09611 |