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Quantum Darwinism in a Composite System: Objectivity versus Classicality
We investigate the implications of quantum Darwinism in a composite quantum system with interacting constituents exhibiting a decoherence-free subspace. We consider a two-qubit system coupled to an -qubit environment via a dephasing interaction. For excitation preserving interactions between the sys...
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| Published in: | Entropy (Basel, Switzerland) Switzerland), 2021-07, Vol.23 (8), p.995 |
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| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
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| cited_by | cdi_FETCH-LOGICAL-c469t-6b680d7aa495b9b99aa94eb784138d23b488b956a64a18a33d76caea9a5fbbd83 |
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| cites | cdi_FETCH-LOGICAL-c469t-6b680d7aa495b9b99aa94eb784138d23b488b956a64a18a33d76caea9a5fbbd83 |
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| container_issue | 8 |
| container_start_page | 995 |
| container_title | Entropy (Basel, Switzerland) |
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| creator | Çakmak, Barış Müstecaplıoğlu, Özgür E Paternostro, Mauro Vacchini, Bassano Campbell, Steve |
| description | We investigate the implications of quantum Darwinism in a composite quantum system with interacting constituents exhibiting a decoherence-free subspace. We consider a two-qubit system coupled to an
-qubit environment via a dephasing interaction. For excitation preserving interactions between the system qubits, an analytical expression for the dynamics is obtained. It demonstrates that part of the system Hilbert space redundantly proliferates its information to the environment, while the remaining subspace is decoupled and preserves clear non-classical signatures. For measurements performed on the system, we establish that a non-zero quantum discord is shared between the composite system and the environment, thus violating the conditions of strong Darwinism. However, due to the asymmetry of quantum discord, the information shared with the environment is completely classical for measurements performed on the environment. Our results imply a dichotomy between objectivity and classicality that emerges when considering composite systems. |
| doi_str_mv | 10.3390/e23080995 |
| format | article |
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-qubit environment via a dephasing interaction. For excitation preserving interactions between the system qubits, an analytical expression for the dynamics is obtained. It demonstrates that part of the system Hilbert space redundantly proliferates its information to the environment, while the remaining subspace is decoupled and preserves clear non-classical signatures. For measurements performed on the system, we establish that a non-zero quantum discord is shared between the composite system and the environment, thus violating the conditions of strong Darwinism. However, due to the asymmetry of quantum discord, the information shared with the environment is completely classical for measurements performed on the environment. 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| ispartof | Entropy (Basel, Switzerland), 2021-07, Vol.23 (8), p.995 |
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| language | eng |
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| source | Open Access: PubMed Central; Publicly Available Content Database; DOAJ Directory of Open Access Journals |
| subjects | decoherence Entropy Hilbert space Objectivity open quantum systems quantum Darwinism Quantum theory Qubits (quantum computing) |
| title | Quantum Darwinism in a Composite System: Objectivity versus Classicality |
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