Seasons & Episodes
Why Suppose There's More Than One World?
Fasten your seat belts and take off into the realm of multiple, maybe even infinite, worlds. Professor Carroll explains
The Classical Physics World That Never Was
Investigate the classical picture of reality, which is how physicists thought the world worked before quantum mechanics.
Quantum Worlds Start With Waves and Particles
The widely accepted system of classical physics began to unravel in 1900 when Max Planck proposed an idea that later bec
A Wave Function to Describe Particles
Transition from the old quantum theory to full-fledged quantum mechanics with the mathematically elegant concept of the
Copenhagen Says the Wave Function Collapses
Quantum mechanics was disquieting to anyone trained in classical physics. To dispel this unease, Niels Bohr and Werner H
Is the Wave Function Real?
Consider exactly what Heisenberg meant by his uncertainty principle, which is often misstated, even by physicists. Go de
Uncertainty in Action With Spin and Qubits
Explore the fundamental quantum property of particles known as "spin," which can come in binary states, like the 0 and 1
Quantum Entanglement and Action at a Distance
Focus on Einstein's objection to a specific feature of quantum mechanics called entanglement, which he termed, "spooky a
Entanglement Leads to Many Worlds
Use concepts developed in the course so far to learn how physicist Hugh Everett arrived at a bold new approach to quantu
Decoherence Explains Branching Worlds
Focus on decoherence, which does the same work in Many-Worlds as the collapse of the wave function in the Copenhagen Int
How Entanglement Powers Quantum Computers
Many-Worlds theorist David Deutsch helped pioneer quantum computing, which he argues is an outgrowth on the Many-Worlds
Too Many Worlds! Five Objections Answered
The Many-Worlds view seems to defy common sense. Why can't we see the other worlds? And don't they violate the laws of p
Testing the Many-Worlds Interpretation
Address another objection to the Many-Worlds Interpretation: its testability. This refers to philosopher Karl Popper's f
Where Does Probability Come From?
Yet another hurdle for Many-Worlds is the origin and nature of probability. The Copenhagen version of quantum mechanics
Quashing Worlds With Wave Function Collapse
Given the mind-boggling implications of Many-Worlds, many physicists have sought plausible alternatives. In this lecture
Blocking Worlds With Hidden Wave Variables
Does the wave function tell the whole story? Explore the hidden variable theory, devised by Louis de Broglie and refined
Mind Before Matter in Quantum Theory
Since quantum mechanics and consciousness are both mysterious, could they be connected in some way? Examine several argu
The Quantum Emergence of the World We See
How does the structure of observed reality emerge from the wave function in Many-Worlds? In other words, where do the wo
The Challenge of Quantum Gravity
Quantum theory accounts for a remarkable array of particles and forces-but not gravity. Learn why constructing a success
Space Emerges From Entanglement
Starting with the basic ingredients of quantum theory-wave functions, Schrödinger's equation, and entanglement-and foll
The Quantum Emergence of Time
As space might be an emergent property of quantum entanglement, could the same be true of time? Divide a wave function i
Free Will, Determinism, and Many-Worlds
Get philosophical by probing a pair of profound questions that arise from the far-out implications of Many-Worlds. Are m
What Happens to Ethics Under Many-Worlds?
A theory in which every moral act entails an immoral one taking place in a branching universe is rife with ethical quand
A Future Renaissance for Quantum Mechanics
Many-Worlds and competing theories on the foundations of quantum mechanics may seem essential for our understanding of r
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