What happens when quantum mechanics and relativity meet?
Summary
Scientists from Ben-Gurion University and other countries built a new device called an interferometer to test how gravity affects quantum particles. They sent a single atom along two paths at once—one path where it falls freely and another where it stays still—and then compared the waves of the atom to measure gravity's effect.Key Facts
- Physicists have long predicted what free fall should do to a quantum wave, but no one could test it until now.
- The team created an interferometer that splits a single atom into two paths at the same time.
- One path makes the atom fall freely under gravity; the other keeps it still.
- Both paths end in the same place and time, allowing measurement of wave effects caused by gravity.
- The experiment relies on atoms cooled to nearly absolute zero to observe their wave nature.
- Measuring the change in the atom's wave phase requires comparing the two paths after they come back together.
- The team solved the problem by "shooting" one atom path upward and allowing gravity to bring it back, while the other stayed still.
- This setup allowed interference patterns to be observed without disturbing the atom's quantum state.
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