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 Unveiling environmental entanglement in strongly dissipative qubits


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The coupling of a qubit to a macroscopic reservoir plays a fundamental role in understanding the complex transition from the quantum to the classical world. Considering a harmonic environment, we use both intuitive arguments and numerical many-body quantum tomography to study the structure of the complete wavefunction arising in the strong-coupling regime, reached for intense qubit-environment interaction. The resulting strongly-correlated many-body ground state is built from quantum superpositions of adiabatic polaron-like and non-adiabatic antipolaron-like contributions from the bath of quantum oscillators. The emerging Schr\-odinger cat environmental wavefunctions can be described quantitatively via simple variational coherent states. In contrast to qubit-environment entanglement, we show that non-classicality and entanglement among the modes in the reservoir are crucial for the stabilization of qubit superpositions in regimes where standard theories predict an effectively classical spin.



Author: Soumya Bera; Serge Florens; Harold Baranger; Nicolas Roch; Ahsan Nazir; Alex Chin

Source: https://archive.org/







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