The Key to the Universe

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“Dad…Dad…Dad, wake up!” insisted Shaina, as she tried to awaken her father from his slumber “You have to see what’s on the news!” “Leave me alone” replied Robert, as he grumblingly turned over in his bed, he had only been asleep for three hours because of his late night reading of quantum physics; Robert is a chronic physicist. “What could be so pressing that would possess you to wake me at such a devilish hour?”  Shaina had woken up early and decided to watch the six o’clock news. As she was watching, she viewed something of importance. “It’s about physics” Shaina pleaded in a last hope, before she could say another word her father, now paper thin, was travelling near the speed of light into the living room. After smashing into a large decelerator, he found himself at rest in front of the television. The news cast explained several cases in which quantum computers had broken down or even exploded, they believed that this was caused by some recent imbalance in the atmosphere which was causing the computers to fail. Thankfully no one had been harmed because all computers were in secured and empty areas with no one around when these events took place. Immediately after hearing this, Robert thought of his quantum computer downstairs in his office. As he ran to try and shutdown the computer, he heard a large explosion “BOOOOM!” Luckily he had reinforced his office and made it almost impenetrable to protect any discoveries he would make; last night he was researching entanglement. After completing the security procedures, Robert entered into his office and was devastated to see his powerful computer destroyed. The room was barren as he kept nothing in there other than his computer and a chair, both of which were destroyed. As he scanned the room broken heartedly he saw a drawing on the wall. The light from the single window in his office was shining on an old picture Shaina had drawn for him when she was forty two months old. The picture was of their home. The grass was green, the sun was shining, the flowers were in full bloom and their car was on the drive way. However their house was strangely missing. With nothing more to do Robert decided to finish the picture. Starting with the roof he carefully shaped and detailed a roof to look as similar to theirs as he could, but suddenly he heard a scream, “AHHHHHH!” Shaina shrieked “The roof disappeared!” Shocked, Robert ran up the stairs to find that indeed the roof was gone and rain was pouring in. Without even putting on any shoes he ran outside to see if the explosion had launched the roof. “OUCH!” Robert exclaimed as he jumped up and down. The roof was nowhere in sight and their lawn had seemingly dried up. It was too dark to see, but he could feel the prickly grass under his feet like needles. After retrieving a flashlight from inside Robert went back outside and saw that the grass was dried and yellow and all the flowers in their garden were dead. Robert thought to himself, “Well that’s ironic. This is the complete opposite of the…” Then suddenly it hit him. He rushed back down into his office and erased the beginning of his addition to the picture, and just as he thought the roof had returned. Since the room was so empty when the computer was open, he concluded that the computer had applied the theory it had open to the only two things it could reach, the picture and the world outside of the open window. In excitement, Robert began testing every possibility he could think of. He even realized he had acquired dominion over the solar system, by erasing the Sun from the picture he caused the sun to come out despite how early it was, then he drew rain drops and of course the rain outside ceased. The picture was peculiar and not everything had the opposite effect, some things in the picture were consistent with actuality. He noticed that there was also a ball sitting on the ground in the drawing. He decided to erase it and draw it floating in the air. After doing this he released his pencil and amazingly it floated. Excitedly Robert thought to himself “I could solve the questions of the universe with this!” Then he had another idea, maybe if he erased the picture completely he could discover the meaning of life, or even find God, “Surely with the absence of earth the only thing left would be God” He pondered on this for a while and then called his daughter to come join him. As his daughter sat on his lap, together they began erasing the picture. One by one everything began to disappear: their house, their car, their neighbours’ homes, the tries, and finally after erasing the last piece the pencil disappeared, everything went dark and suddenly earth became a void. Fear began to boil deep within them and as the held each other close the heard a deep powerful rumble, and when they looked up they were speechless…

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Quantum Theories

I is for ... Information

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

P is for ... Probability

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.

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.

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.

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”.

G is for ... Gluon

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

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.

K is for ... Kaon

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

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.

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.

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 ... 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.

R is for ... Radioactivity

The atoms of a radioactive substance break apart, emitting particles. It is impossible to predict when the next particle will be emitted as it happens at random. All we can do is give the probability that any particular atom will have decayed by a given time.

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!

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 ... Randomness

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

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.

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.

I is for ... Interferometer

Some of the strangest characteristics of quantum theory can be demonstrated by firing a photon into an interferometer: the device’s output is a pattern that can only be explained by the photon passing simultaneously through two widely-separated slits.

G is for ... Gravity

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.

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.

C is for ... Computing

The rules of the quantum world mean that we can process information much faster than is possible using the computers we use now.

T is for ... Tunnelling

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.

N is for ... Nonlocality

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.

A is for ... Atom

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

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.

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.

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 ... Teleportation

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.

D is for ... Decoherence

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

U is for ... Universe

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

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.

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.

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.

D is for ... Dice

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.

Q is for ... Qubit

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.

X is for ... X-ray

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.

E is for ... Entanglement

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.

C is for ... Cryptography

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

A is for ... Act of observation

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

L is for ... Light

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!

R is for ... Reality

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!

S is for ... Superposition

Quantum objects can exist in two or more states at once: an electron in superposition, for example, can simultaneously move clockwise and anticlockwise around a ring-shaped conductor.

W is for ... Wavefunction

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.

M is for ... Multiverse

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.