Conceptual diagram: (2+1) Dimensional relativistic Baumian orbit. Credit: Dou et al.
Quantum technology works by exploiting the mechanical effects of various quantums, including entanglement. Entanglement occurs when two or more particles share a correlation state even when they are separated.
When two particles are intertwined, the intrinsic angular momentum (i.e., spin) of one particle can affect that of its intertwined partner. This suggests that the energy of the second particle can be altered by nonlocal correlation without allowing faster communication than light.
Researchers from Shanghai Ziaoton University and Hebei National Laboratory recently conducted a study aimed at experimentally testing this theoretical prediction using two quantum memories.
Their findings published in the physical review letter appear to confirm the existence of nonlocal energy changes, thereby broadening our current understanding of quantum nondilution.
“When two particles are in a spin-entangled state, measuring one particle affects the spin state of the other,” Xian-Min Jin and Dr. Jian-Peng Dou told Phys.org that they are co-authors of the paper.
“This insight has led us to bold inference: Quantum correlations can allow for non-local changes in energy distributions within space.
To investigate the presence of nonlocal energy changes predicted by previous theoretical works, Dr. Zinn, Doo and colleagues used two quantum memories: devices that can generate, store, probe, and retrieve quantum states.
These memories are used to create optical devices that can separate and recombine the wave functions of quantum systems, and to measure quantum interference, also known as Machsender interferometers.
“We show the Stokes photons (S1) generated during the writing process of two quantum memory as the first particle, but the simultaneously generated atomic excitation functions as the second particle,” explained Zinn and Dr.
“These two particles naturally have the quantum correlations needed for this study, as they come from the same spontaneous Raman scattering process.”
Changes in Baumian orbital distribution and atomic excitation predicted by nonlocal theoretical models. QM: Quantum memory. The wavy arrows indicate that energy disappears in one quantum memory and reappears in another. Credit: Dou et al.
The experimental setup allowed researchers to determine the location of the atomic excitation (i.e., acting as the second particle in the system) and the associated measurements. This was accomplished either by performing read operations in quantum memory to make powerful measurements or by a weak probe-based method known as single-photon Raman scattering.
“Weak probe processes can be explained in a specific way as follows: Imagine an observer with obstructed vision trying to find atomic excitation (i.e. energy),” Zinn and Dr.
“Each observation slightly suppresses quantum memory and produces blurry but useful information about the location of energy. This location information is inaccurate, but when combined with selection and selection, it plays an important role and can examine quantum correlations between past and future events.”
Jing, Do, and his colleagues were able to ultimately predict the distribution of Baume trajectories of Stokes photons within the system, and predict changes in the position of conditional probability associated with atomic excitation.
We then compared the measured probability magnitudes to verify the nonlocality of De Broglie-Bohm’s interpretation. This is a theory that predicts the presence of observed nonlocal energy changes.
“Our experimental results are consistent with predictions of non-local theory,” said Jing and Do. “The results imply that, within the framework of the De Broglie-Bohm theory, for two intertwined particles, the energy carried by one of them can be changed from one location to another, under the non-local influence of the other particles.
“This is exactly the “nonlocal energy change” proposed in this study. It is important to emphasize that the term used here is “change” rather than “transfer.” This means that this process does not involve supercure energy transfer (i.e., non-local energy modifications induced by quantum correlation). ”
The experimental investigation of quantum nonlocality researchers from an energy perspective has yielded interesting results that could inform future research focusing on nonlocal energy changes between spin particles.
Other physicists tested the De Broglie-Bohm theory using similar experimental methods, and were able to quickly draw inspiration from their work.
“We will not reject the stochastic interpretation of quantum mechanics for the time being, supporting Bohm’s theory,” added Jin and Dr.
“In this study, quantum memory demonstrates a unique feature that can contribute to the testing of fundamental problems in quantum mechanics. These include a detailed investigation of quantum non-dilution, delay selection, sky waves, light velocity oscillations in the interference domain, and the inherent consistency of quantum mechanics and relational principles.”
Details: Jian-Peng Dou et al, Testing Nonlocal Energy Changes Between Two Quantum Memory, Physical Review Letter (2025). doi: 10.1103/physrevlett.134.093601.
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Citation: Experimental test of nonlocal energy changes between two quantum memories (March 21, 2025) obtained from https://phys.org/news/2025-03-experiental-nonlocal-energy-quantum-memories.htmllied.htmll on March 22, 2025
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