Atoms few, damned but quick... Magnetic fields sources, RF antennas, optical structures, all integrated in a micro-chip with a Bose-Einstein condensate a few hundred microns from the surface: an "Atom chip". The benefits are higher trap frequencies, shorter evaporative time, better atom-field coupling plus a much (much) cheaper set-up. The goal of our experiment is to make the best use of Atom chips for quantum technological applications.

Quantum Undo operations with an Atom Chip

In this work we experimentally demonstrate that the undo of an operation is possible also in quantum regimes. The last performed operation can be time-reversed via the undo command so as to perfectly restore a condition in which any new operation can be applied by an external user. We exploit the optimal control algorithm based on the dressed chopped random basis method, to perform several time-reversal transformations. We implement this algorithm by applying different levels of complexity, in terms of control, in order to manipulate the forward and backward internal state dynamics of a 87Rb Bose–Einstein condensate within an atom chip. As well as providing a thermodynamic interpretation of our results, in this paper we demonstrate that the quantum undo command can be performed also by time-reversing an operation in a generic instant of the past. The concept of quantum undo can be thus generalized. An external user, indeed, will be able to restore not only the last but also any past step of his complex computational routine. We are confident that our successful results could be applied in the next future on a real gate-based quantum computer.

I. Mastroserio, et al.,
Experimental Realization of Optimal Time-Reversal on an Atom Chip for Quantum Undo Operations
Adv. Quantum Technol. 2022, 2200057 (2022)

Paper appeared as back cover on Advanced Quantum Technologies 12/2022.

Micro-Rb people

Ludovica Donati
PhD Student
Chiara Mazzinghi
Research Fellow
Natalia Bruno
Scientific Staff
Francesco Saverio
Cataliotti
Scientific Staff
Former members:
Ivana Mastroserio
Saverio Bartalini
Shahid Cherukattil
Luigi Consolino
Hoang-Van Do
Vera Guarrera
Ivan Herrera
Pietro Lombardi
Cosimo Lovecchio
Ali Khan Murtaza
Jovana Petrovic
Florian Schäfer

Micro-Rb contacts

For further information, request of material, job opportunities, please contact:

Francesco Saverio Cataliotti
(fsc@lens.unifi.it)

Micro-Rb funding

FIRB Futuro in Ricerca
2008 HYTEQ
PRIN2010-2011