January 2025 - Qtcg

Fwd: Participación estudiantes doctorado/grado/máster en bbq Quantum Youth
by Daniel Manzano 10 Jan '25

10 Jan '25

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Nuevo artículo
by Juani Bermejo Vega 08 Jan '25

08 Jan '25

Feliz año a todes, I hope you had a good vacation. I wanted to share with you our latest work that has been published in Nature Communications: Ringbauer, M., Hinsche, M., Feldker, T. et al. Verifiable measurement-based quantum random sampling with trapped ions. Nat Commun 16, 106 (2025). https://urldefense.com/v3/__https://doi.org/10.1038/s41467-024-55342-3__;!!… https://urldefense.com/v3/__https://www.nature.com/articles/s41467-024-5534… https://urldefense.com/v3/__https://arxiv.org/html/2307.14424v2__;!!D9dNQww… We have some fun protocols here to do fidelity estimation of quantum states using single qubit measurements. They have been implemented in ion traps and applied to verifying quantum advantage experiments. Best, Juani

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New group calendar
by Juani Bermejo Vega 08 Jan '25

08 Jan '25

Dear all, I am sending you an invitation to the new group calendar. https://urldefense.com/v3/__https://calendar.google.com/calendar/u/1?cid=cX… I will export all events from our current calendar to this one. If you can already begin to use it instead of the old one that would be great :) Best, Juani

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Quantum Matter Summer School
by Daniel Manzano 08 Jan '25

08 Jan '25

Dear group. In September there is a nice school here in Granada, and Michalis will be one of the speakers. I encourage you all to assist, including Master Students. The fee is 500 euros because it includes accommodation. I talked to the organiser and she said that you may indicate that you do not require housing and we will negotiate a reduced fee afterwards. You have also to propose a poster title, but it is provisional and can be changed afterwards (just write something related to what you're doing in the group). Please, register ASAP. In the last section: "Any other comments including: allergies, special requirements or motivation, etc” please write: Member of the QTCG at the University of Granada. I do not require accomodation. Here is the link: https://granada-summer-school.com/ Best, Dani. --------------------------------------------------------------------------------- Daniel Manzano Quantum Thermodynamics and Quantum Computation Group University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 https://ic1.ugr.es/members/dmanzano/

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Re: Sesión Miércoles 8 de Enero
by Juani Bermejo Vega 08 Jan '25

08 Jan '25

Dear Noelia and quantum group, First, thanks Noelia, this was a tough paper to read and I enjoyed the presentation a lot. I keep wondering about the assumptions behind the Google result. I would like to share a few questions and possibly interesting papers, in case you would like to look into this paper further. a) It is not so clear to me that XEB is a good proxy of the fidelity under general error models. If I understand correctly, they tested depolarizing noise. But it is known that XEB is not the fidelity for error channels such as amplitude damping. My impression is that they have a hidden strong assumption about the type of noise that is present on their superconducting chip. (This was also the case in their famous quantum supremacy paper.) b) Also, maybe I missed this, but I didnt fully understand how robust the phase transition is for large system sizes. I wonder if the results are system size dependent and how much. I am of the impression there might be open questions in both of these directions (what is a good metric of entanglement here and scaling of the results), and that perhaps one can test their hypothesis for classically simulable circuits on the cluster. I saw a recent flow up where they use the logarithmic entanglement negativity to measure correlations and do classical simulations of stabilizer circuits: https://urldefense.com/v3/__https://journals.aps.org/prb/abstract/10.1103/P… Circuits with a few number of T gates can also approximate arbitrary moments of the Haar measure, additively, as shown here, so perhaps they can be used as a proxy to universal random quantum circuits: https://urldefense.com/v3/__https://arxiv.org/pdf/2002.09524__;!!D9dNQwwGXt… If anyone is interested in this and wants to keep reading let me know. At this point I mostly am trying to understand the result and the implications. Best, Juani El mar, 7 ene 2025 a las 13:57, Daniel Manzano (<manzano(a)onsager.ugr.es>) escribió: > Dear all, tomorrow we continue with our Journal Club. > > Noelia Sánchez (Fisymat student) will update us about phase transitions in > quantum circuits. > > Attached is the paper we'll see: > > > Best, > > Dani. > > > -- > You received this message because you are subscribed to the Google Groups > "Quantum Journal Club" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to quantum-journal-club+unsubscribe(a)googlegroups.com. > To post to this group, send email to quantum-journal-club(a)googlegroups.com > . > To view this discussion, visit > https://urldefense.com/v3/__https://groups.google.com/d/msgid/quantum-journ… > <https://urldefense.com/v3/__https://groups.google.com/d/msgid/quantum-journ… > > . > For more options, visit https://urldefense.com/v3/__https://groups.google.com/d/optout__;!!D9dNQwwG… . > > > > --------------------------------------------------------------------------------- > Daniel Manzano > Quantum Thermodynamics and Quantum Computation Group > University of Granada > Facultad de Ciencias, Av. Fuentenueva s/n > Granada 18071, Spain > Phone: +34 958241000 Ext: 20569 > *https://ic1.ugr.es/members/dmanzano/ > <https://ic1.ugr.es/members/dmanzano/>* > > > > > > > > > > > > > > > > > > > -- > You received this message because you are subscribed to the Google Groups > "Quantum Journal Club" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to quantum-journal-club+unsubscribe(a)googlegroups.com. > To post to this group, send email to quantum-journal-club(a)googlegroups.com > . > To view this discussion, visit > https://urldefense.com/v3/__https://groups.google.com/d/msgid/quantum-journ… > <https://urldefense.com/v3/__https://groups.google.com/d/msgid/quantum-journ… > > . > For more options, visit https://urldefense.com/v3/__https://groups.google.com/d/optout__;!!D9dNQwwG… . >

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Fwd: [qipc.spain] QuantumSpain - Plazas abiertas en CESGA - Fecha tope de solicitud 13/01/2025
by Daniel Manzano 07 Jan '25

07 Jan '25

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