Little-endian
Little-endian is a byte-order convention in which the least significant byte of a multibyte value comes first, at the lowest address or earliest position.
Quantum Programming in Depth
Little-endian encoding orders a bit string or composite value with its least significant bit or component first.
- How it is used
- Maps quantum basis-state bit strings to integer indices for amplitudes, matrices, controls, and measurements.
- How deep it goes
- Derives even/odd amplitude decomposition for recursive state preparation and traces ordering into controlled gates and test code.
- Examples
- Uses |01⟩, even and odd amplitude groups, Q# control-array reversal, and Qiskit basis-state measurement tests.
- What you can do after
- Apply it via Qiskit and Q# by matching amplitude, control, and measurement conversions to each language’s convention.
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Latency
A byte order that stores the least significant byte of a multi-byte value first and the most significant byte last.
- How it is used
- Explains in-memory representation and serialization costs when optimizing applications for low latency.
- How deep it goes
- Defines byte ordering and works through 32-bit layouts, but stops short of implementation code or broader protocol details.
- Examples
- Uses 0xE011CFD0, order ID 1001, a Rust order struct, and JSON serialization as concrete examples.
- What you can do after
- Evaluate/understand how multi-byte values occupy memory and transform between in-memory and serialized formats.
Related concepts
- Qiskitused by · Qiskit is an open-source software development kit for constructing, simulating, compiling, and executing quantum circuits.
- endiannesskind of · Endianness is the convention that determines the order in which the bytes of a multibyte value are represented in memory or a serialized form.
- big-endiancontrasts with · Big-endian is an ordering convention in which the most significant byte or component of a multibyte value comes before its less significant components.
- ApplyControlledOnIntused by · ApplyControlledOnInt is a Q# standard-library operation that applies a gate when control qubits match an integer-encoded bit pattern.
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