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Constructing Qubits in Physical Systems

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arxiv quant-ph/0101090 v1 pith:MRZPBMMA submitted 2001-01-18 quant-ph

classification quant-ph
keywords qubitsquantumsystemsphysicalqubitabstractastonishingcharacterization
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The notion of a qubit is ubiquitous in quantum information processing. In spite of the simple abstract definition of qubits as two-state quantum systems, identifying qubits in physical systems is often unexpectedly difficult. There are an astonishing variety of ways in which qubits can emerge from devices. What essential features are required for an implementation to properly instantiate a qubit? We give three typical examples and propose an operational characterization of qubits based on quantum observables and subsystems.

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  1. Partitions in quantum theory

    quant-ph 2025-06 conditional novelty 7.0 of 10

    A definition of multipartitions of quantum systems into possibly non-factor sub-C* algebras, with a representation theorem showing that some partitions, such as fermionic modes, are not fully representable on tensor-p...

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