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What Is Quantum Physics?

If you're new to the field, we suggest you start here. Learn about the origins of quantum physics, also known as quantum mechanics, why mathematics is essential to the field, and how the act of observing the smallest objects can affect them.

What Is Quantum Computing?

Find out how quantum computers work, the advances they might make possible, and why universities, technology companies, and government agencies are racing to develop them.

What Is Entanglement and Why Is It Important?

Entanglement is at the heart of quantum physics and emerging quantum technologies. Read about how scientists proved its existence, and watch Caltech scientists take a stab at explaining this "spooky" phenomenon.

What Is Superposition and Why Is It Important?

Go beyond Schrödinger's cat and learn more about superposition, a concept that might be difficult to visualize but could hold the key to advancing technology such as quantum computers.

What Is the Uncertainty Principle and Why Is It Important?

Formulated by the German physicist and Nobel laureate Werner Heisenberg in 1927, the uncertainty principle states that we cannot know both the position and speed of a particle, such as a photon or electron, with perfect accuracy. Find out why.

How Do Scientists Conduct Quantum Experiments?

Let this comic take you inside the labs where researchers probe the subatomic world of quantum physics.

How Will Quantum Technologies Change Cryptography?

Quantum information science has the potential to change computer encryption. Researchers envision secure cryptography that can't be cracked by future quantum computers and are exploring how the properties of quantum mechanics could be used to send communications that are impervious to eavesdropping.

How Are Quantum Phenomena Used in Technology Today?

Surprising but true: Quantum mechanics are at work inside of your toaster and other devices we encounter in everyday life.


Ask a Caltech Expert

Quantum computers aren't the only application for quantum science. Caltech scientists are researching ways to revolutionize chemistry, materials, sensing, and more.

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