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Bosonic Nevanlinna Analytic Continuation

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arxiv 2305.03449 v1 pith:O3B56L3O submitted 2023-05-05 quant-ph cond-mat.quant-gascond-mat.str-el

Bosonic Nevanlinna Analytic Continuation

classification quant-ph cond-mat.quant-gascond-mat.str-el
keywords continuationnevanlinnaanalyticbosonsfermionsmethodaccuratelyallowing
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Analytical continuation (AC) connects theoretical calculations and experimentally measurable quantities. The recently proposed Nevanlinna AC method is capable of accurately reproducing the sharp features of spectral functions at high frequencies while maintaining the causality of the response function. However, their use is currently limited to fermions. Here, we present an extension of this method to bosons using the hyperbolic tangent trick, allowing us to transform bosons into auxiliary fermions to which the Nevanlinna analytic continuation can be applied.

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