@article{TEXTUAL,
      recid = {11698},
      author = {Avdic, Irma and Sager-Smith, LeAnn M. and Ghosh, Indranil  and Wedig, Olivia C. and Higgins, Jacob S. and Engel,  Gregory S. and Mazziotti, David A.},
      title = {Quantum sensing using multiqubit quantum systems and the  Pauli polytope},
      journal = {Physical Review Research},
      address = {2023-10-30},
      number = {TEXTUAL},
      abstract = {Quantum sensing has highly practical potential  applications in fields ranging from fundamental physics and  quantum communication to biophysics and bioengineering.  However, achieving high fidelity and control of entangled  qubits that enables sensing beyond the quantum limit is  still a challenging endeavor. In this paper, we present an  alternative approach to quantum sensing, which we call  open-system quantum sensing, where we exploit a  generalization of the Pauli exclusion principle to sense  the openness of a multiqubit quantum system from only  measurement of the qubit occupations. Qubit occupations of  a pure state obey generalized Pauli exclusion constraints  that define a convex set known as the Pauli polytope, and  hence violation of one of these constraints—a facet of the  polytope—reveals a mixed state from the interaction of a  quantum system with its environment without performing  full-state tomography. We examine experimental ultrafast  spectroscopic data from the photosynthetic light-harvesting  complex in green sulfur bacteria and show that we can sense  and decode the relaxation of the complex due to  environmental noise. More generally, we can apply  open-system quantum sensing with any general multiqubit  quantum system, where it provides a unique, visual approach  that promises enhanced sensitivity and fidelity.},
      url = {http://knowledge.uchicago.edu/record/11698},
}