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Our experiments at the IBM NISQ machines: BasQ

 

We have been awarded with one of the six BasQ projects performing experiments in the IBM quantum computers. The project at partnership with IBM is yielding its first fruits. For more information, please read this. 

An atomic-scale multi-qubit platform

 Individual electron spins in solids are promising candidates for quantum science and technology, where bottom-up assembly of a quantum device with atomically precise couplings has long been envisioned. Here, we realized atom-by-atom construction, coherent operations, and readout of coupled electron-spin qubits using a scanning tunneling microscope.

 Yu Wang, Yi Chen, Hong T Bui, Christoph Wolf, Masahiro Haze, Cristina Mier, Jinkyung Kim, Deung-Jang Choi, Christopher P Lutz, Yujeong Bae, Soo-hyon Phark, Andreas J Heinrich. Science 382, 87 - 92 (2023)

Moiré dispersion of edge states in spin chains on superconductors

 We show that the oscillations with energy of edge states in in-gap states induced by spin chians on s-wave superconductors are due to a moiré superstructure due to the wavevector of electronic interactions (Fermi wave vector) and the periodicity imposed by the spin lattice. This work explains recent experiments on Majorana bound states and predicts that is possible to have topological states at non-zero energies.

Cristina Mier, Deung-Jang Choi, and Nicolás Lorente Phys. Rev. Research 4, L032010 (2022)

Superconducting Scanning Tunneling Microscope Tip to Reveal Sub-millielectronvolt Magnetic Energy Variations on Surfaces

We show extraordinary energy resolution with an STM by using a superconducting tip with sharp quasiparticle density of states. This permits us to reveal small changes in molecular magnetic anisotropy energy depending on the adsorption site and orientation. As a consequence, we show that a two-dimensional array of nickelocene molecules on a Pb(111) substrate is highly non-collinear. 

 

The Journal of Physical Chemistry Letters 12, 2983–2989 (2021).

Vibrations with Kondo at the single-molecule level

  Check out our last paper in Nano Letters. Here, we do a follow-up of our Science paper, changing the nickelocene molecular tip by a cobaltocene one. Cobaltocene is spin 1/2 and displays a strong Kondo peak that couples to multiple vibrations. We show that some spectral features are due to the coupling of Kondo plus molecular vibrations.

New paper in Nano Letters

Check out our last paper in Nano Letters. In this theoretical-experimental study in collaboration with CNRS colleagues we show how an organic molecule becomes magnetic after being doped by Aluminum atoms. This is interesting since we show how magnetism can be turned on without the need of transition metal atoms, but with a light, non-magnetic dopant.