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Springer eBooks

Dissipation and Reduction of Superconducting States Due to Spontaneous Localization

Mariamargherita Buffa, O. Nicrosini, A. Rimini

Published Jan 1, 1995• 0 citations
Publisher
DOI
10.1007/978-1-4899-1391-3_22

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The continuous spontaneous localization (CSL) model is an alternative formulation of quantum mechanics, which introduces a noise-coupled nonlinearly to the wave function to account for its collapse. We consider CSL effects on quantum computers made of superconducting transmon qubits. As a direct effect CSL reduces quantum superpositions of the computational basis states of the qubits: we show the reduction rate to be negligibly small. However, an indirect effect of CSL, dissipation induced by the noise, also leads transmon qubits to decohere, by generating additional quasiparticles. Since the decoherence rate of transmon qubits depends on the quasiparticle density, by computing their generation rate induced by CSL, we can estimate the corresponding quasiparticle density and thus the limit set by CSL on the performances of transmon quantum computers. We show that CSL could spoil the quantum computation of practical algorithms on large devices. We further explore the possibility of testing CSL effects on superconducting devices.
The Continuous Spontaneous Localization (CSL) model is an alternative formulation of quantum mechanics which introduces a noise coupled non linearly to the wave function to account for its collapse. We consider CSL effects on quantum computers made of superconducting transmon qubits. As a direct effect CSL reduces quantum superpositions of the computational basis states of the qubits: we show the reduction rate to be negligibly small. However, an indirect effect of CSL, dissipation induced by the noise, also leads transmon qubits to decohere, by generating additional quasiparticles. Since the decoherence rate of transmon qubits depends on the quasiparticle density, by computing their generation rate induced by CSL, we can estimate the corresponding quasiparticle density and thus the limit set by CSL on the performances of transmon quantum computers. We show that CSL could spoil the quantum computation of practical algorithms on large devices. We further explore the possibility of testing CSL effects on superconducting devices.
Abstract We investigate dissipation-induced trade-offs between nonlocal entanglement and local quantum coherence in a two-qubit system coupled to an open superconducting cavity. Using concurrence C , intrinsic concurrence, and the total first-order coherence ( FOC ) of the reduced two-qubit state, we examine how the initial distribution angle, coherent-field intensity, and spontaneous-emission damping redistribute quantum resources during the system evolution. We find that increasing the damping rate and coherent-field intensity suppresses entanglement generation and revivals, whereas the FOC can remain finite over a wide range of parameters. Within this open-system description, the purity of the two-qubit state (or equivalently its mixedness) provides an effective budget that governs the competition between coherence and entanglement in the dynamics. Our results provide a clear physical picture of how dissipation reshapes the balance between local coherence and nonlocal quantum correlations in realistic qubit-cavity platforms, highlighting the relative robustness of coherence compared to entanglement under environmental interactions.