seminar – Engineering quantum coherence and control in diluted spin systems

On Wednesday, November 13th 2024, we have the pleasure to welcome in SPINTEC Irinel Chiorescu from Florida State University. He will give us a seminar at 11:00 entitled :
Engineering quantum coherence and control in diluted spin systems

Place : IRIG/SPINTEC, auditorium 445 CEA Building 10.05 (access to CEA requires an entry authorization. Request it before November 02th at admin.spintec@cea.fr)

video conference : https://univ-grenoble-alpes-fr.zoom.us/j/98769867024?pwd=dXNnT3RMeThjYStybGVQSUN0TVdJdz09
Meeting ID: 987 6986 7024
Passcode: 025918

Abstract : Recently we have demonstrated experimentally the implementation of a novel and universal method to increase the decoherence time of spins qubits [1] in systems with different anisotropies / symmetries / spin-orbit coupling and type of element. The method is based on Floquet engineering of spin qubits quasi-energies by adding a second microwave drive with a frequency commensurate to that of the main Rabi drive. Qualitatively, the increase in coherence time can be linked to dynamical sweet spots (level repulsion) in quasi-energy spectra. Quantitatively, we add insight using numerical simulations [2] aiming to clarify the actual physical processes that take place in the bath surrounding the qubit. We are also exploring the potential use of spin systems as quantum memories [3] and to that effect, we have performed spectroscopic and pulsed studies of S=7/2 Gd ions placed on a coplanar stripline superconducting resonator. In the weak coupling limit, continuous-wave spectroscopy of the cavity resonance perturbation allows us to detect the forbidden electro-nuclear transition of the 155,157Gd isotopes by applying a static field almost perpendicular to crystal c-axis [4]. By increasing the coupling of the spin ensemble to the resonator we observe spin-cavity dressed states with a large mode splitting of ~150 MHz. Numerical simulations based on Dicke model shows a strong hybridization of the first excited level in the presence of a photon and the second excited level with no photon as well as a strong perturbation of the spin ground state generated by photons.

  1. S. Bertaina, H. Vezin, H. De Raedt, and I. Chiorescu, Experimental protection of quantum coherence by using a phase-tunable image drive, Scientific Reports 10, 1 (2020)
  2. De Raedt, H.; Miyashita, S.; Michielsen, K.; Vezin, H.; Bertaina, S.U.; Chiorescu, I., Sustaining Rabi oscillations by using a phase-tunable image drive, European Physical Journal B, 95 (9), 158 (2022)
  3. M. Blencowe, Quantum computing: Quantum RAM, Nature 468, 44 (2010).
  4. Franco-Rivera, G.; Cochran, J.R.; Miyashita, S.; Bertaina, S.U.; Chiorescu, I., Strong Coupling of a Gd3+ Multilevel Spin System to an On-Chip Superconducting Resonator, Physical Review Applied, 19, 024067 (2023).

Address : Department of Physics, Florida State University and the National High Magnetic Field Laboratory, Tallahassee, FL 32310

web page : https://physics.fsu.edu/person/irinel-chiorescu


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