New experiment verifies quantum spookiness
New experiment verifies quantum spookiness
Quote:
Originally Posted by Science News
It’s official: Quantum mechanics is spooky.
A new experiment provides the best evidence yet that the common-sense concept of locality — that an event on Earth can’t immediately influence what happens on Mars, for instance — doesn’t apply in the quantum realm.
Researchers have long thought that quantum theory is nonlocal. But airtight experimental confirmation has been difficult to achieve. Now a new paper, posted online August 26 at arXiv.org, closes two loopholes that had cast a smidgen of doubt on previous results from a crucial test.
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The new Bell test by Bas Hensen, a quantum physicist at Delft University of Technology in the Netherlands, and colleagues required two diamond chips that were placed in labs nearly 1.3 kilometers apart. Each chip contained a tiny defect with an electron inside. The researchers zapped the diamonds with lasers, which spurred each chip to emit a photon that was entangled with the electron. Those photons were sent to a third lab (located between the other labs) and fed through a beam splitter. Whenever detectors at the ends of the beam splitter captured two photons at the same time, there was a transfer of entanglement — now the electrons in the two chips were entangled with each other. Then the researchers randomly performed one of two measurements on the electrons’ spin. The physicists confirmed that the outcomes of those measurements matched more often than Bell’s limit.
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A new experiment provides the best evidence yet that the common-sense concept of locality — that an event on Earth can’t immediately influence what happens on Mars, for instance — doesn’t apply in the quantum realm.
Researchers have long thought that quantum theory is nonlocal. But airtight experimental confirmation has been difficult to achieve. Now a new paper, posted online August 26 at arXiv.org, closes two loopholes that had cast a smidgen of doubt on previous results from a crucial test.
...
The new Bell test by Bas Hensen, a quantum physicist at Delft University of Technology in the Netherlands, and colleagues required two diamond chips that were placed in labs nearly 1.3 kilometers apart. Each chip contained a tiny defect with an electron inside. The researchers zapped the diamonds with lasers, which spurred each chip to emit a photon that was entangled with the electron. Those photons were sent to a third lab (located between the other labs) and fed through a beam splitter. Whenever detectors at the ends of the beam splitter captured two photons at the same time, there was a transfer of entanglement — now the electrons in the two chips were entangled with each other. Then the researchers randomly performed one of two measurements on the electrons’ spin. The physicists confirmed that the outcomes of those measurements matched more often than Bell’s limit.
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