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American Focus > Blog > Tech and Science > Could we get quantum spookiness even without entanglement?
Tech and Science

Could we get quantum spookiness even without entanglement?

Last updated: August 1, 2025 3:50 pm
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Could we get quantum spookiness even without entanglement?
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Quantum physics has always been a fascinating and mind-boggling subject, delving into the mysterious and counterintuitive nature of the universe. Recently, a groundbreaking experiment conducted by Xiao-Song Ma and his team at Nanjing University in China has challenged our understanding of quantum entanglement and non-local correlations.

The experiment revolved around a modified version of John Stewart Bell’s famous test for entanglement, which aims to distinguish between the predictions of quantum mechanics and classical theories. While previous experiments confirming non-locality relied on entangled particles, Ma’s team managed to achieve similar results without entanglement.

Using four crystals that emitted pairs of photons with measurable properties like polarization and phase, the researchers guided these photons through a series of optical devices before reaching a detector. In a typical Bell test, two observers, Alice and Bob, measure entangled particles to determine non-local correlations. However, in this experiment, Alice and Bob were represented by optical devices without entangled photons.

Surprisingly, when the researchers analyzed the measurements using Bell’s inequality equation, they found that the photons exhibited non-local correlations even without entanglement. This unexpected result challenges conventional notions of quantum mechanics and suggests that there may be other quantum properties at play.

One such property is the concept of “indistinguishability by path identity,” where the photons were created in a way that made it impossible to determine their origins. While this property has been used to entangle photons in the past, Ma’s team demonstrated that it could also lead to non-local correlations without entanglement.

Despite the intriguing findings, some physicists like Mario Krenn and Jeff Lundeen have raised concerns about the experimental setup, particularly the use of post-selection and the possibility of observer collusion. While the implications of this experiment are still being debated, it represents a significant step towards understanding the complex nature of quantum phenomena.

See also  Plastic ‘fossils’ help scientists reconstruct the history of bird nests

Looking ahead, Ma and his team are working to address potential loopholes in their experiment and improve their devices to further explore the mysteries of quantum physics. By pushing the boundaries of our understanding, they are paving the way for new insights into the fundamental nature of reality.

TAGGED:entanglementQuantumspookiness
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