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arXiv · 2306.13708

Coherent-State Ladder Time-Dependent Variational Principle for Open Quantum Systems

David S. Schlegel·Fabrizio Minganti·Vincenzo Savona
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Abstract

We present a new paradigm for the dynamical simulation of interacting many-boson open quantum systems. The method relies on a variational ansatz for the $n$-boson density matrix, in terms of a superposition of photon-added coherent states. It is most efficient for the simulation of driven-dissipative systems where the state is well described by quantum fluctuations on top of a displaced field, making it suitable for the simulation of several coupled modes with large occupation numbers, that are otherwise very challenging using a Fock-space expansion. We test our method on several examples, demonstrating its potential application to the predictive simulation of interacting bosonic systems and cat qubits.

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David S. Schlegel, Fabrizio Minganti, Vincenzo Savona. 2023-06-23. Coherent-State Ladder Time-Dependent Variational Principle for Open Quantum Systems. https://arxiv.org/abs/2306.13708

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