Unmaking Sense

Episode 13.32: The Grover Comparator and Uncomputing

How does a Grover oracle test whether a solution is a solution without measuring the state vector it is assessing and so destroying it? Invisible operators and hidden manipulation. Uncomputing as a road from the depths of the enigma back to somewhere closer to where we can obtain the answer.

Episode 13.31: Quantum Computing as Metaphor

In what respects the quantum world and our access to it is a fitting metaphor for the human brain and consciousness as what we can directly know about it.

Episode 13.30: What Quantum Computing Can Do and What it Can’t

Quantum multiplication as a challenge. Why it can work and why it is difficult.

Episode 13.29: Unmaking Sense of the Classical World

Quantum computing teaches and forces us to think differently because it is impossible to understand it in terms of classical physics. Superposition, entanglement, oracles, diffusers, invisible answers and impenetrable state vectors all combine to present us with an entirely new conceptual world that unmakes sense of the older one.

Episode 13.28: The Grover Diffuser

How do we extract a usable answer from a Grover oracle that marks solutions but doesn’t and can’t tell us what they are? The answer lies in the diffuser, which amplifies marked states and suppresses others.

Episode 13.27: The Grover Oracle

What is the Grover oracle? Why is it called an oracle? How it works. And how it doesn’t.

Episode 13.26: A Cosmic Harmony

We are made by the universe and can only experience what our evolved states allow. The persistents that are the building-blocks of our existence also define what we can know, how we must learn it, and the limits of what we can know. All our experiments embody interaction Hamiltonians so by measuring one thing we can learn of the things they are entangled with. And nothing else. That defines the limits of our world.

Episode 13.25: How we Learn about the World

When a photo interacts with an object and then entangles with the pointer states that are the persistent characteristics of that object, how does it then convey that information either to ourselves as observers or more importantly to the environment itself? How do we leverage this mechanism to learn about objects in the world? This is an inconclusive exploration; a much better answer will be given in episode 26.

Episode 13.24: Are things we observe real?

When we observe the world by interacting with photons and other particles that act as witnesses, do we interpret the world only in the way in which our brains invent things like colour, secondary qualities as John Locke described them, or do we see the world as it in some sense ‘really is’?

Episode 13.23: Quantum Darwinism and Pointer States

This is the first of three episodes that explores the question of how information about the objects in the world is transferred into us as human observers, and more particularly and importantly how it is transferred into the environment as it monitors the persistence of the objective classical world that emerges from the quantum world.