The Quanta Podcast Quantum Weirdness Now a Matter of Time
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Jan 28, 2016 Strange quantum links that tie together different moments in time, not just places. Experiments mimic spatial entanglement using sequential measurements and detectors that sweep frequencies. Schemes for time-locked encryption and time capsules are explored. Ideas about indefinite causal order and putting gravity into superposition hint that spacetime itself might emerge from correlations.
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Design Rapid Frequency-Scanning Detectors
- Build detectors that scan frequencies over short time windows to exploit temporal entanglement with the vacuum.
- Olson and Ralph propose superconducting loops tuned to sweep femtoseconds to reveal vacuum 'glow' and test quantum field theory.
Quantum Time Capsules From Vacuum Correlations
- Temporal correlations can encrypt a message into vacuum correlations so it is retrievable only when paired with a future measurement.
- This enables time-locked quantum messages and entanglement generation without sending quantum signals.
Reconstructing Order From Correlations
- Strong quantum correlations challenge standard causal explanations and don't fit cleanly into space-time frameworks.
- Some theorists propose deducing event order from dependencies rather than presuming an underlying space-time.