Quantum bit
A quantum bit, or qubit, is a unit of quantum information represented by a two-level quantum system that can occupy a superposition of basis states.
Building Quantum Software with Python
A qubit, or quantum bit, is the fundamental unit of quantum information and can exist in a superposition of two computational-basis states.
- How it is used
- Represents computation state and measured binary outputs in quantum programs.
- How deep it goes
- Develops single- and multi-qubit states through amplitudes, measurements, registers, gates, and array representations while deferring hardware details.
- Examples
- Uses a variable-bias coin, two- and three-qubit binary outcomes, state visualizations, and knapsack registers.
- What you can do after
- Evaluate/understand quantum-program outputs as binary strings and relate qubit states to outcome probabilities.
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Real-World Cryptography
A quantum bit is a quantum information unit that can occupy a superposition of the binary states 0 and 1.
- How it is used
- Supports quantum-computer computation by replacing classical bits with transformable quantum states.
- How deep it goes
- Defines superposition, probabilistic measurement, gates, and entanglement, but stops short of implementation details.
- Examples
- Uses electron spin, Schrödinger’s cat, quantum random number generators, a 53-qubit computer, and IBM Quantum circuits.
- What you can do after
- Operate IBM Quantum to build and execute small quantum circuits on hosted quantum computers.
Related concepts
- ancillary qubitincludes · An ancillary qubit is an additional qubit used to store intermediate information or enable operations during a quantum computation.
- quantum computerused by · A quantum computer is a computing device that processes information using quantum-mechanical states and operations.
- precisionproduces · Precision is the proportion of items identified as positive, selected, or retrieved that satisfy the relevant correctness or relevance criterion.
- quantum systemused by · A quantum system is a physical system whose states and dynamics are described by quantum mechanics, including quantum evolution and measurement.
- binary stringused by · A binary string is a finite, ordered sequence of binary digits, each having the value zero or one.
- quantum circuitpart of · A quantum circuit is an ordered arrangement of quantum gates, measurements, and related operations that specifies a computation on qubits.
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