Dispersive Readout of Molecular Spin Qudits

Álvaro Gómez-León, Fernando Luis, and David Zueco
Phys. Rev. Applied 17, 064030 – Published 14 June 2022

Abstract

We study the physics of a magnetic molecule described by a “giant” spin with multiple (d>2) spin states interacting with the quantized cavity field produced by a superconducting resonator. By means of the input-output formalism, we derive an expression for the output modes in the dispersive regime of operation. It includes the effect of magnetic anisotropy, which makes different spin transitions addressable. We find that the measurement of the cavity transmission allows us to uniquely determine the spin state of the qudits. We discuss, from an effective Hamiltonian perspective, the conditions under which the qudit readout is a nondemolition measurement and consider possible experimental protocols to perform it. Finally, we illustrate our results with simulations performed for realistic models of existing magnetic molecules.

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  • Received 8 October 2021
  • Revised 4 March 2022
  • Accepted 13 May 2022

DOI:https://doi.org/10.1103/PhysRevApplied.17.064030

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Álvaro Gómez-León1,*, Fernando Luis2, and David Zueco2

  • 1Instituto de Física Fundamental IFF-CSIC, Calle Serrano 113b, Madrid 28006, Spain
  • 2Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain

  • *a.gomez.leon@csic.es

See Also

Optimal Control of Molecular Spin Qudits

Alberto Castro, Adrián García Carrizo, Sebastián Roca, David Zueco, and Fernando Luis
Phys. Rev. Applied 17, 064028 (2022)

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Vol. 17, Iss. 6 — June 2022

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