SAMOP 2023 – scientific programme

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QI: Fachverband Quanteninformation

QI 32: Quantum Optics and Quantum Information with Rigid Rotors (joint session MO/Q/QI)

QI 32.4: Talk

Thursday, March 9, 2023, 15:15–15:30, F102

Decoherence-Free Rotational Degrees of Freedom for Quantum Applications — •Julen S. Pedernales, Francesco Cosco, and Martin B. Plenio — Institut für Theoretische Physik und IQST, Albert-Einstein-Allee 11, Universität Ulm, D-89081 Ulm, Germany

I will describe the use of spherical t-designs for the systematic construction of solids whose rotational degrees of freedom can be made robust to decoherence due to external fluctuating fields while simultaneously retaining their sensitivity to signals of interest. Specifically, the ratio of the signal phase accumulation rate from a nearby source to the decoherence rate caused by fluctuating fields from more distant sources can be incremented to any desired level by using increasingly complex shapes. This allows for the generation of long-lived macroscopic quantum superpositions of rotational degrees of freedom and the robust generation of entanglement between two or more such solids with applications in robust quantum sensing and precision metrology as well as quantum registers.

[1] J. S. Pedernales, F. Cosco, and M. B. Plenio, Phys. Rev. Lett. 125, 090501 (2020).