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PBS Space Time

We Were Wrong About the Quantum Eraser!

Season 11 Episode 14 | 23m 22s

Does quantum mechanics allow the future to retroactively influence the past, as in the infamous delayed choice quantum eraser experiment? How about we get an actual quantum physicist--who many of you already know--to show us how to do this experiment at home, and hopefully set this matter to rest.

Aired: 10/15/25
Extras
Watch • 14:27
PBS Space Time
We Thought Black Holes Ended in Singularities. They Might End In a Frozen Big Bang
Physicists hope Planck stars can save us from black hole singularities and paradoxes.
Episode: S11 E28 | 14:27
Watch • 17:41
PBS Space Time
We Found Galaxies Too Old for the Universe
Galaxies older than the universe? Webb's findings keep defying our best explanations.
Episode: S11 E27 | 17:41
Watch • 16:16
PBS Space Time
Earth’s Core Should Be Impossible. A New State of Matter Explains It.
Earth's core: solid or liquid? Yes — we know more about distant galaxies than our own interior.
Episode: S11 E26 | 16:16
Watch • 14:42
PBS Space Time
Something Disturbing Happens When You Solve Einstein's Equations This Way
Gödel found a time-travel solution in General Relativity, revealing spacetime can loop on itself.
Episode: S11 E25 | 14:42
Watch • 18:46
PBS Space Time
Martian Soil Is Deadly. And That's Why It Might Support Life
Tardigrades can survive almost anything—even most of Mars. But one Martian chemical stops even them.
Episode: S11 E24 | 18:46
Watch • 18:18
PBS Space Time
Is the LHC Creating Dark Matter?
The Higgs boson may open a portal to hidden particles that could explain dark matter.
Episode: S11 E23 | 18:18
Watch • 19:02
PBS Space Time
Dark Energy Is Driving the Universe Apart. We May Finally Know Why.
The universe expands faster. “Dark energy” may not be constant after all.
Episode: S11 E22 | 19:02
Watch • 16:26
PBS Space Time
Our Only Chance To Finally Unlock The Gravity Particle
There’s a new generation of experiments that may unlock the gravity particle.
Episode: S11 E21 | 16:26
Watch • 18:33
PBS Space Time
The Particle We’ve Been Chasing for 30 Years Might Not Exist
The universe thrums with quantum fields, except something may be missing: the sterile neutrino.
Episode: S11 E20 | 18:33
Watch • 18:42
PBS Space Time
The Universe Itself Might Be Hiding the Gravity Particle From Us
Gravitons, the particle of quantum gravity, may be impossible to detect.
Episode: S11 E19 | 18:42
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  • PBS Space Time Season 2
  • PBS Space Time Season 1
Watch • 14:27
PBS Space Time
We Thought Black Holes Ended in Singularities. They Might End In a Frozen Big Bang
Physicists hope Planck stars can save us from black hole singularities and paradoxes.
Episode: S11 E28 | 14:27
Watch • 17:41
PBS Space Time
We Found Galaxies Too Old for the Universe
Galaxies older than the universe? Webb's findings keep defying our best explanations.
Episode: S11 E27 | 17:41
Watch • 16:16
PBS Space Time
Earth’s Core Should Be Impossible. A New State of Matter Explains It.
Earth's core: solid or liquid? Yes — we know more about distant galaxies than our own interior.
Episode: S11 E26 | 16:16
Watch • 14:42
PBS Space Time
Something Disturbing Happens When You Solve Einstein's Equations This Way
Gödel found a time-travel solution in General Relativity, revealing spacetime can loop on itself.
Episode: S11 E25 | 14:42
Watch • 18:46
PBS Space Time
Martian Soil Is Deadly. And That's Why It Might Support Life
Tardigrades can survive almost anything—even most of Mars. But one Martian chemical stops even them.
Episode: S11 E24 | 18:46
Watch • 18:18
PBS Space Time
Is the LHC Creating Dark Matter?
The Higgs boson may open a portal to hidden particles that could explain dark matter.
Episode: S11 E23 | 18:18
Watch • 19:02
PBS Space Time
Dark Energy Is Driving the Universe Apart. We May Finally Know Why.
The universe expands faster. “Dark energy” may not be constant after all.
Episode: S11 E22 | 19:02
Watch • 16:26
PBS Space Time
Our Only Chance To Finally Unlock The Gravity Particle
There’s a new generation of experiments that may unlock the gravity particle.
Episode: S11 E21 | 16:26
Watch • 18:33
PBS Space Time
The Particle We’ve Been Chasing for 30 Years Might Not Exist
The universe thrums with quantum fields, except something may be missing: the sterile neutrino.
Episode: S11 E20 | 18:33
Watch • 18:42
PBS Space Time
The Universe Itself Might Be Hiding the Gravity Particle From Us
Gravitons, the particle of quantum gravity, may be impossible to detect.
Episode: S11 E19 | 18:42