2003•Journal of the Physical Society of JapanOpen access

Quantum Zeno Subspaces and Decoherence

Paolo Facchi, Saverio Pascazio

Abstract

A profound consequence of the quantum Zeno effect is the partitioning of the total Hilbert space into quantum Zeno subspaces, among which any transition is hindered. Such a phenomenon can be due to frequent nonselective measurements, frequent unitary kicks or strong continuous coupling. Its practical relevance for halting decoherence is discussed and the problem of timescales is considered.

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Key concepts: Quantum Zeno effect, Quantum decoherence, Decoherence-free subspaces, Linear subspace, Zeno's paradoxes, Hilbert space, Quantum mechanics, Physics