A few useful words.

Definitions to keep beside your reading.

Bit
A classical information unit with two possible values, usually labeled 0 and 1.
Qubit
A quantum system whose state can be a superposition of two basis states.
Amplitude
A complex-number coefficient of a quantum state; its squared magnitude gives an outcome probability in the chosen basis.
Interference
Combination of amplitudes that changes outcome probabilities through reinforcement or cancellation.
Entanglement
A property of a joint quantum state that cannot be represented as a mixture of independent states of its parts.
Physical qubit
A hardware system used to represent quantum information.
Logical qubit
Quantum information encoded using multiple physical systems and an error-correcting code.
Classical baseline
The specified classical method against which a quantum method is compared.
Quantum annealing
An approach that evolves a system toward low-energy states of an encoded problem; distinct from a universal gate circuit.
Bookings
Orders under a company's stated definition; not interchangeable with recognized revenue.
Dilution
A reduction in an existing shareholder's ownership percentage when additional shares are issued.
Operating cash flow
Cash generated or used by operating activities over a reporting period.

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