The Cat in the Box

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Well this is new.  It reminds me of the kitchen, but it’s messier.  And there’s nothing that smells like food.  Or water.  Or a litter box.  Man, this isn’t my home at all.  I must get familiar.  So much weird new stuff.  Hey, what’s this?  This looks nice and safe.
“See?  I told you.  Cats dig boxes.  He just walked right in.”
“Latch it and mark the time.”
“Door shut at 7:18 pm.”
Hmm.  It’s dark in here.  Kind of cozy too.  I think my tail’s a little messy.  And this surface is off.  Ridgy.  
Cold.  Silent.  Not breathing.  Not seeing.
That’s better.  What’s this thing?  Smells metallic.  Feels metallic.  Will it move if I paw at it?
No light.  Alone.  No smells.  Blackness.  Emptiness.
That was fun.  Now what?  It’s a nice, tight little box.  I feel pretty safe in here.  I think I’ll just have a nap.  That’s the ticket.  A nice, comfortable nap.
“You sure he can’t break the device?”
“Yeah.  Pretty sure.”
“Hey, um, what if it triggers?”
“What if?”
“Well, won’t we be opening a box full of cyanide gas?”
“Open all the windows.  Let’s get a draft going in here.”
Well that was pleasant.  Feeling a bit out of order so I’ll have a wash.
Suspended.  Not afraid.  Nothing to fear.  Nothing to need.
“Forty-five minutes.”
Okay, I’m done with this.  I’d like to get out and explore.  This box was just part of a huge room with lots of corners and things I know nothing about.  I climbed in here because it seemed safe and cozy but I really need out now.
Void.  Not asleep.  Not awake.  There’s no way in.  There’s no way out.
I can’t get out and no one’s letting me out.  I’m meowing as loud as I can and no one’s letting me out.  What’s that?  A sound.  New air.  I smell....
Smell.  There’s a scent.
Fresh air.  Bright light.  Life.
“Wow, that is one pissed-off cat.  Where’d he go?”
“I’m not sure but he just ripped up my hand.  Disconnect the device before there’s a decay event and we all get killed.”
“Got it.  Wow.  It was working the whole time.  Found the cat?”
I don’t know you and I don’t like you.
“He’s under your desk.  Seems a bit miffed.”
“Can you blame him?  I mean, it’s got to be hard, being alive and dead at the same time.”
“He’s a cat.  I doubt he even knew what happened.”
Define “don’t know” you son of a mouse.
“C’mere buddy, come on out, I’ll give you some nice tu-OW!”
“Hey, I hear someone outside the door.”
My person!  My perfect precious person!  I can smell you!  Save me from your idiot students!
“So what if it’s Laurence?”
“We broke up.”
“My bad.  What if it’s the boss?”
“Well, don’t you think she’ll be a might be mad if she finds us with her cat?”
“Eh, she’ll probably just be happy the little monster got found.”
“Well, technically, he was never really lost.”
Come here so I can scratch you again, fishguts.
“She doesn’t need to know that.”
“I don’t need to know what?”
“Nothing...wasn’t that door locked?”
“Latch is funny.  Hello Patches.  What are you doing here?”
“We found him.”
Find this, dogbreath.
“I see you two are getting along famously.  Come here, kitty.  That box had better not be what I think it is.”
“Oh.  No.  It’s not.  It’s just a box.”
“Good.  I’d hate to think that the money for your project was being spent on something else.  Otherwise I might have to fund your new Ti-sapphire by having you teach next semester.”
“Oh, well, it’s just a box.  Just a metal box.”
“With a gasket.  And acoustic lining.”
“I can explain that.”
“I’m sure you can.  How does the lab section for Foundations of Physics sound?  Most of your students will be pre-med.”
“Goodnight boys.”
Go take a bath, you rotten lump of hairballs.
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Quantum Theories: A to Z

Q is for ...
Quantum States

Quantum states, which represent the state of affairs of a quantum system, change by a different set of rules than classical states.

L is for ...
Large Hadron Collider (LHC)

At CERN in Geneva, Switzerland, this machine is smashing apart particles in order to discover their constituent parts and the quantum laws that govern their behaviour.

N is for ...

When two quantum particles are entangled, it can also be said they are “nonlocal”: their physical proximity does not affect the way their quantum states are linked.

G is for ...

Our best theory of gravity no longer belongs to Isaac Newton. It’s Einstein’s General Theory of Relativity. There’s just one problem: it is incompatible with quantum theory. The effort to tie the two together provides the greatest challenge to physics in the 21st century.

C is for ...

People have been hiding information in messages for millennia, but the quantum world provides a whole new way to do it.

T is for ...

Quantum tricks allow a particle to be transported from one location to another without passing through the intervening space – or that’s how it appears. The reality is that the process is more like faxing, where the information held by one particle is written onto a distant particle.

R is for ...

Since the predictions of quantum theory have been right in every experiment ever done, many researchers think it is the best guide we have to the nature of reality. Unfortunately, that still leaves room for plenty of ideas about what reality really is!

E is for ...

When two quantum objects interact, the information they contain becomes shared. This can result in a kind of link between them, where an action performed on one will affect the outcome of an action performed on the other. This “entanglement” applies even if the two particles are half a universe apart.

P is for ...
Planck's Constant

This is one of the universal constants of nature, and relates the energy of a single quantum of radiation to its frequency. It is central to quantum theory and appears in many important formulae, including the Schrödinger Equation.

W is for ...
Wave-particle duality

It is possible to describe an atom, an electron, or a photon as either a wave or a particle. In reality, they are both: a wave and a particle.

T is for ...

The arrow of time is “irreversible”—time goes forward. On microscopic quantum scales, this seems less certain. A recent experiment shows that the forward pointing of the arrow of time remains a fundamental rule for quantum measurements.

G is for ...

These elementary particles hold together the quarks that lie at the heart of matter.

U is for ...
Uncertainty Principle

One of the most famous ideas in science, this declares that it is impossible to know all the physical attributes of a quantum particle or system simultaneously.

B is for ...
Bose-Einstein Condensate (BEC)

At extremely low temperatures, quantum rules mean that atoms can come together and behave as if they are one giant super-atom.

S is for ...
Schrödinger’s Cat

A hypothetical experiment in which a cat kept in a closed box can be alive and dead at the same time – as long as nobody lifts the lid to take a look.

B is for ...
Bell's Theorem

In 1964, John Bell came up with a way of testing whether quantum theory was a true reflection of reality. In 1982, the results came in – and the world has never been the same since!

F is for ...
Free Will

Ideas at the heart of quantum theory, to do with randomness and the character of the molecules that make up the physical matter of our brains, lead some researchers to suggest humans can’t have free will.

D is for ...

Unless it is carefully isolated, a quantum system will “leak” information into its surroundings. This can destroy delicate states such as superposition and entanglement.

X is for ...

In 1923 Arthur Compton shone X-rays onto a block of graphite and found that they bounced off with their energy reduced exactly as would be expected if they were composed of particles colliding with electrons in the graphite. This was the first indication of radiation’s particle-like nature.

C is for ...

The rules of the quantum world mean that we can process information much faster than is possible using the computers we use now. This column from Quanta Magazine ​delves into the fundamental physics behind quantum computing.

A is for ...

This is the basic building block of matter that creates the world of chemical elements – although it is made up of more fundamental particles.

H is for ...
Hidden Variables

One school of thought says that the strangeness of quantum theory can be put down to a lack of information; if we could find the “hidden variables” the mysteries would all go away.

L is for ...

We used to believe light was a wave, then we discovered it had the properties of a particle that we call a photon. Now we know it, like all elementary quantum objects, is both a wave and a particle!

A is for ...
Act of observation

Some people believe this changes everything in the quantum world, even bringing things into existence.

V is for ...
Virtual particles

Quantum theory’s uncertainty principle says that since not even empty space can have zero energy, the universe is fizzing with particle-antiparticle pairs that pop in and out of existence. These “virtual” particles are the source of Hawking radiation.

C is for ...

The most precise clocks we have are atomic clocks which are powered by quantum mechanics. Besides keeping time, they can also let your smartphone know where you are.

I is for ...

Some of the strangest characteristics of quantum theory can be demonstrated by firing a photon into an interferometer

D is for ...

Albert Einstein decided quantum theory couldn’t be right because its reliance on probability means everything is a result of chance. “God doesn’t play dice with the world,” he said.

T is for ...
Time travel

Is time travel really possible? This article looks at what relativity and quantum mechanics has to say.

A is for ...
Alice and Bob

In quantum experiments, these are the names traditionally given to the people transmitting and receiving information. In quantum cryptography, an eavesdropper called Eve tries to intercept the information.

T is for ...

This happens when quantum objects “borrow” energy in order to bypass an obstacle such as a gap in an electrical circuit. It is possible thanks to the uncertainty principle, and enables quantum particles to do things other particles can’t.

O is for ...
Objective reality

Niels Bohr, one of the founding fathers of quantum physics, said there is no such thing as objective reality. All we can talk about, he said, is the results of measurements we make.

Q is for ...

One quantum bit of information is known as a qubit (pronounced Q-bit). The ability of quantum particles to exist in many different states at once means a single quantum object can represent multiple qubits at once, opening up the possibility of extremely fast information processing.

P is for ...

Quantum mechanics is a probabilistic theory: it does not give definite answers, but only the probability that an experiment will come up with a particular answer. This was the source of Einstein’s objection that God “does not play dice” with the universe.

W is for ...

The mathematics of quantum theory associates each quantum object with a wavefunction that appears in the Schrödinger equation and gives the probability of finding it in any given state.

K is for ...

These are particles that carry a quantum property called strangeness. Some fundamental particles have the property known as charm!

U is for ...

To many researchers, the universe behaves like a gigantic quantum computer that is busy processing all the information it contains.

M is for ...

Quantum physics is the study of nature at the very small. Mathematics is one language used to formalise or describe quantum phenomena.

K is for ...

Quantum Key Distribution (QKD) is a way to create secure cryptographic keys, allowing for more secure communication.

I is for ...

Many researchers working in quantum theory believe that information is the most fundamental building block of reality.

H is for ...
Hawking Radiation

In 1975, Stephen Hawking showed that the principles of quantum mechanics would mean that a black hole emits a slow stream of particles and would eventually evaporate.

R is for ...

Unpredictability lies at the heart of quantum mechanics. It bothered Einstein, but it also bothers the Dalai Lama.

M is for ...
Many Worlds Theory

Some researchers think the best way to explain the strange characteristics of the quantum world is to allow that each quantum event creates a new universe.

M is for ...

Our most successful theories of cosmology suggest that our universe is one of many universes that bubble off from one another. It’s not clear whether it will ever be possible to detect these other universes.

E is for ...

As the world makes more advances in quantum science and technologies, it is time to think about how it will impact lives and how society should respond. This mini-documentary by the Quantum Daily is a good starting point to think about these ethical issues. 

Z is for ...
Zero-point energy

Even at absolute zero, the lowest temperature possible, nothing has zero energy. In these conditions, particles and fields are in their lowest energy state, with an energy proportional to Planck’s constant.

S is for ...
Schrödinger Equation

This is the central equation of quantum theory, and describes how any quantum system will behave, and how its observable qualities are likely to manifest in an experiment.

J is for ...
Josephson Junction

This is a narrow constriction in a ring of superconductor. Current can only move around the ring because of quantum laws; the apparatus provides a neat way to investigate the properties of quantum mechanics and is a technology to build qubits for quantum computers.

Q is for ...
Quantum biology

A new and growing field that explores whether many biological processes depend on uniquely quantum processes to work. Under particular scrutiny at the moment are photosynthesis, smell and the navigation of migratory birds.

Y is for ...
Young's Double Slit Experiment

In 1801, Thomas Young proved light was a wave, and overthrew Newton’s idea that light was a “corpuscle”.

S is for ...

The feature of a quantum system whereby it exists in several separate quantum states at the same time.

S is for ...

Researchers are harnessing the intricacies of quantum mechanics to develop powerful quantum sensors. These sensors could open up a wide range of applications.

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