What Quantum Computers Are Revealing About Time Is Terrifying

Hey guys! We’re now live on Spotify🎧 Listen here: https://open.spotify.com/show/0h2WEZg... Somewhere on a laboratory bench, in a chamber chilled almost to absolute zero, a small piece of the world was made to run in reverse — its disorder gathering quietly back into order, the forward march of time undone for a single moment. It was not a trick of film and not a figure of speech. It was a machine, doing to time the one thing the rest of the universe never does. And reversing the arrow is only the beginning: these machines can also blur the line between before and after, and build a working clock out of nothing but connection. If the forward flow you trust most was never a law at all, then what, exactly, have we been living inside all along? 🌌 TONIGHT'S JOURNEY: • A machine on a laboratory bench that ran a moment backward — and the astronomical price it had to pay. • A device with no fact of the matter about which of two events came first. • A theorem, ninety years old, that quietly left time off the list of real things. • A whole universe built from two particles of light, static from the outside and flowing from within. ✨ WHAT YOU'LL DRIFT THROUGH: A slow, patient descent from a single cold experiment down to the oldest questions there are — the arrow of time, the order of cause and effect, and whether the present moment is a feature of the universe or only of you. Cross a century of physics, from spinning atoms to entangled clocks, and sit for a while with a possibility that both of our greatest theories keep arriving at. 🌠 SETTLE IN: Get cozy and let tonight's journey take you across the cosmos. New videos for slow nights and quiet skies — subscribe and drift along. CHAPTERS 0:00 Introduction 1:26 The Machine That Ran Time Backward 11:58 An Arrow Made of Odds 22:57 The One Place the Law Bends 32:32 When Before and After Come Apart 44:42 Order You Can Spend 56:21 The Quantity That Was Never There 1:07:23 Putting the Pieces Together 1:15:38 Evolution Without Evolution 1:27:30 A Universe Made of Two Particles 1:39:22 The Clocks We Live By 1:48:50 The Other Road to the Same Place 1:58:46 What This Is Not 2:07:34 The Song That Exists Only While Sung SOURCES Arrow of time and its reversal on the IBM quantum computer (Scientific Reports, 2019) — https://www.nature.com/articles/s4159... Arrow of time and its reversal on IBM quantum computer (arXiv:1712.10057) — https://arxiv.org/abs/1712.10057 Experimental superposition of a quantum evolution with its time reverse (Phys. Rev. Research, 2024) — https://journals.aps.org/prresearch/a... Experimental aspects of indefinite causal order in quantum mechanics (Nature Reviews Physics, 2024) — https://www.nature.com/articles/s4225... Indefinite Causal Order in a Quantum Switch (Phys. Rev. Lett. 121, 090503) — https://link.aps.org/doi/10.1103/Phys... Device-independent certification of indefinite causal order in the quantum switch (Nature Communications, 2023) — https://www.nature.com/articles/s4146... Time from quantum entanglement: an experimental illustration (Phys. Rev. A 89, 052122) — https://link.aps.org/doi/10.1103/Phys... Time from quantum entanglement: an experimental illustration (arXiv:1310.4691) — https://arxiv.org/abs/1310.4691 Pauli's theorem and quantum canonical pairs (Proc. R. Soc. A) — https://royalsocietypublishing.org/do... Quantum-amplified global-phase spectroscopy on an optical clock transition (Nature, 2025) — https://www.nature.com/articles/s4158... MIT physicists improve the precision of atomic clocks (MIT News, 2025) — https://news.mit.edu/2025/mit-physici... BaBar makes first direct measurement of time-reversal violation (Physics World) — https://physicsworld.com/a/babar-make... Observation of Time-Reversal Violation in the B Meson System (arXiv:1207.5832) — https://arxiv.org/abs/1207.5832 — ⚠️ DISCLAIMER: The content on this channel is for entertainment and informational purposes only. While we strive for accuracy and source our factual data from official sources, some videos may include theories, speculation, and analysis that represent the creator's interpretation of events. All scripts clearly distinguish between verified facts and speculation/theories. This channel does not claim to be a news outlet. Viewer discretion is advised. #QuantumTimeReversal #IndefiniteCausalOrder