How To Make a Quantum Bit | Summary and Q&A

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July 23, 2013
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Veritasium
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How To Make a Quantum Bit

TL;DR

Quantum computers utilize qubits, which are built on the spin states of particles, to perform computations much faster than classical computers.

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Key Insights

  • ๐Ÿ’ป Quantum computers can solve certain problems exponentially faster than classical computers.
  • ๐Ÿ’ Qubits are the basic units of information in quantum computers and are built using the spin states of particles.
  • ๐Ÿ˜Ž Cooling the qubit apparatus to near absolute zero is necessary to ensure the qubit's stability in a specific state.
  • ๐Ÿ’— Writing information onto a qubit involves applying a specific frequency pulse of microwaves.
  • ๐Ÿซ  Reading information from a qubit is accomplished using a nearby transistor that detects the qubit's spin state.
  • โ“ Qubits can be created using the spin states of not only electrons but also nuclei.
  • ๐Ÿ”ฎ Purified silicon crystals with specific isotopes are used to eliminate unwanted magnetic effects in qubit systems.

Transcript

To find the prime factors of a 2048 number it would take a classical computer millions of years, a quantum computer could do it in just minutes. And that is because a quantum computer is built on qubits, these devices which take advantage of quantum super position to reduce the number of steps required to complete the computation. But how do you ac... Read More

Questions & Answers

Q: How does a quantum computer find prime factors of a large number so quickly?

A quantum computer utilizes qubits, which can exist in multiple states simultaneously, allowing it to quickly search for the correct factors through quantum superposition.

Q: How are qubits created in practice?

Researchers use the outermost electron in a phosphorous atom embedded in a silicon crystal as a qubit by manipulating its spin state with a strong magnetic field.

Q: How is information written onto a qubit?

Information can be written onto a qubit by applying a specific frequency pulse of microwaves, which depends on the magnetic field that the qubit is in.

Q: How is information read from a qubit?

Information from a qubit is read using a nearby transistor that detects whether the qubit is in the spin up or spin down state by measuring the pulse of current.

Summary & Key Takeaways

  • Quantum computers can find the prime factors of a large number in minutes, while classical computers would take millions of years.

  • Qubits, the building blocks of quantum computers, take advantage of quantum superposition to reduce computation time.

  • Qubits can be created using the spin states of particles, such as the outermost electron in a phosphorous atom.

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