Decoherence of spin registers revisited

Abstract

We revisit decoherence process of a qubit register interacting with a thermal bosonic bath. We generalize the previous studies by considering not only the register's behavior but also of a part of its environment. In particular, we are interested in information flow from the register to the environment, which we describe using recently introduced multipartite quantum state structures called Spectrum Broadcast Structures. Working in two specific cases of: i) two-qubit register and ii) collective decoherence, we identify the regimes where the environment acquires almost complete information about the register state. We also study in more detail the interesting causal aspects, related to the finite propagation time of the field disturbances between the qubits. Finally, we describe quantum state structures which appear due to the presence of protected spaces.

arXiv comment10 pages, v2: references added

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• Mathematical Models of Markovian Dephasing
• A glimpse of objectivity in bipartite systems for non-entangling pure dephasing evolutions
• Appearance of objectivity for NV centers interacting with dynamically polarized nuclear environment
• Blurred quantum Darwinism across quantum reference frames
• Nanophotonic Super-dephasing in Collective Atom-Atom Interactions
• A signature of quantumness in pure decoherence control
• Harnessing spin-qubit decoherence to probe strongly-interacting quantum systems
• Commutativity and the emergence of classical objectivity
• Decoherence and objectivity in higher spin environments
• Thermality versus objectivity: can they peacefully coexist?