Constructing Qubits in Physical Systems

Details Constructing Qubits in Physical Systems Constructing Qubits in Physical Systems

2001-01-18

arxiv.org/abs/quant-ph/0101090v1

Physics

Quantum Physics

16 pages, no figures; IoP LaTeX2e style. Submitted to J. Phys. A: Math. Gen

Scientific paper

10.1088/0305-4470/34/35/331

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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