# Flaminia Giacomini

Yvonne Choquet-Bruhat Fellow

Perimeter Institute for Theoretical Physics

Areas of research:

### Research Interests

In my research I address, with techniques proper of the fields of Quantum Information and Quantum Foundations, problems related to the interplay between quantum mechanics and gravity. In particular, I have focussed on some features that could arise as a consequence of a non-classical structure of the spacetime: indefiniteness of causality relations and generalised transformations between two reference frames in a quantum relation with each other. In addition, I am interested in the low-energy effects that a quantum theory of gravity would manifest, which could be in the reach of short- to mid-term experimental technologies.

### Positions Held

### Awards

- Outstanding Reviewer award from the journal "Classical and Quantum Gravity"
- Winner of the "Pio Picchi" Prize of the Italian Physical Society
- First prize in the Gravity Research Foundation 2019 Essays on Gravitation with the essay "Information Content of the Gravitational Field of a Quantum Superposition" (shared with the coauthors A. Belenchia, R. M. Wald, E. Castro Ruiz, C. Brukner, M. Aspelmeyer)

### Recent Publications

- T. D. Galley, F. Giacomini, J. H. Selby, "A no-go theorem on the nature of the gravitational field beyond quantum theory", arXiv:quant-ph/2012.01441 (2020) (accepted for publication in Quantum)
- F. Giacomini, A. Kempf, "Second-quantized Unruh-DeWitt detectors and their quantum reference frame transformations", Phys. Rev. D 105, 125001 (2022)
- F. Giacomini, C. Brukner, "Quantum superposition of spacetimes obeys Einstein's Equivalence Principle", AVS Quantum Sci. 4, 015601 (2022)
- V. Baumann*, F. Del Santo*, A. R. H. Smith*, F. Giacomini, E. Castro Ruiz, C. Brukner, "Generalized probability rules from a timeless formulation of Wigner's friend scenarios", Quantum 5, 524 (2021)
- F. Giacomini, "Spacetime Quantum Reference Frames and superpositions of proper times", Quantum 5, 508 (2021)
- A. Ballesteros, F. Giacomini, G. Gubitosi, "The group structure of dynamical transformations between quantum reference frames", Quantum 5, 470 (2021)
- L. F. Streiter*, F. Giacomini*, C. Brukner, "Relativistic Bell Test within Quantum Reference Frames", Phys. Rev. Lett. 126, 230403 (2021)
- E. Castro Ruiz, F. Giacomini, A. Belenchia, C. Brukner, "Quantum clocks and the temporal localisability of events in the presence of gravitating quantum systems", Nat. Commun. 11, 2672 (2020)
- A. Vanrietvelde, P. A. Höhn, F. Giacomini, E. Castro Ruiz, "A change of perspective: switching quantum reference frames via a perspective-neutral framework", Quantum 4, 225 (2020)
- A. Belenchia, R. M. Wald, F. Giacomini, E. Castro Ruiz, C. Brukner, M. Aspelmeyer, "Information Content of the Gravitational Field of a Quantum Superposition", IJMPD 28(14), 1943001 (2019)
- F. Giacomini, E. Castro Ruiz, C. Brukner, "Relativistic quantum reference frames: the operational meaning of spin", Phys. Rev. Lett. 123, 090404 (2019)
- F. Giacomini, E. Castro Ruiz, C. Brukner, "Quantum mechanics and the covariance of physical laws in quantum reference frames", Nat. Commun. 10, 494 (2019)
- A. Belenchia, R. M. Wald, F. Giacomini, E. Castro Ruiz, C. Brukner, M. Aspelmeyer, "Quantum superposition of massive objects and the quantization of gravity", Phys. Rev. D 98, 126009 (2018)
- G. Amelino Camelia, F. Giacomini, G. Gubitosi, "Thermal and spectral dimension of (generalized) Snyder noncommutative spacetimes", Phys. Lett B 784, 50-55 (2018)
- E. Castro Ruiz, F. Giacomini, C. Brukner, "Dynamics of quantum causal structures", Phys. Rev. X 8, 011047 (2018)
- E. Castro Ruiz, F. Giacomini, C. Brukner, "Entanglement of quantum clocks through gravity", PNAS 114, E2303 (2017)
- F. Giacomini, E. Castro Ruiz, C. Brukner, "Indefinite causal structures for continuous-variable systems", New J Phys 18, 113026 (2016)
- L.-Q. Chen, F. Giacomini, C. Rovelli, "Quantum States of Fields for Quantum Split Sources", arXiv:quant-ph/2207.10592 (2022)
- C. Cepollaro, F. Giacomini, M. G. A. Paris, "Gravitational time dilation as a resource in quantum sensing", arXiv:quant-ph/2204.03006, (2022)
- C. Cepollaro, F. Giacomini, "Quantum generalisation of Einstein's Equivalence Principle can be verified with entangled clocks as quantum reference frames", arXiv:quant-ph/2112.03303 (2021)
- F. Giacomini, C. Brukner, "Einstein's Equivalence principle for superpositions of gravitational fields and quantum reference frames", arXiv:quant-ph/2012.13754 (2020)
- A. Vanrietvelde, P. A. Höhn, F. Giacomini, "Switching quantum reference frames in the N-body problem and the absence of global relational perspectives", arXiv:quant-ph/1809.05093, (2018);

### Seminars

- Invited talk at The Quantum, the Thermal and the Gravitational Reconciled: Physics and Philosophy in the Varied Landscape of the Intersections, Munich, Germany
- Invited talk at the VIII International Workshop on Quantum Mechanics and Quantum Information (online)
- Invited Gravity Seminar at the Center of Applied Space Technology and Microgravity (ZARM) of University of Bremen
- Colloquium at the Center for Theoretical Physics of the Polish Academy of Sciences
- Invited seminar to Beyond Spacetime collaboration, University of Illinois Chicago, USA
- Invited seminar to Particle Physics Research Group at Stanford University, USA
- Invited seminar to Martin-Martinez's Research Group at Institute for Quantum Computing, Canada (online)
- Invited seminar to Moslem Zarei's Research Group at Isfahan University of Technology, Iran (online)
- Invited seminar to Patrick Hayden's Research Group at Stanford University, USA (online)
- Invited seminar to Mauro Paternostro's Research Group at Queen's University Belfast (online)
- Invited talk at Quantum Boundaries 2021, Nottingham, UK (online)
- Invited talk at the Vienna Quantum Foundations Conference, Vienna, Austria
- Invited seminar to Valerio Scarani's Research Group at the Centre for Quantum Technologies, Singapore (online)
- Invited talk at Quantum Physics and Logic, Gdansk (online)
- Invited lecture at the Loop Quantum Gravity Summer School (online)
- Invited talk at the Symposium on the interplay between quantum matter and gravity, jointly organised by the Univerity of Leeds, DIAS, and Universite Libre de Bruxelles (online)
- Seminar to the Mathematical Physics Group at Ludwig-Maximilian Universitaet Munich, Germany. Host: Prof. Daniele Oriti (online)
- Invited talk at the APS March Meeting (online)
- Seminar to the Quantum Information Theory Research Group, ETH Zurich. Host: Prof. Renato Renner (online)
- Seminar to the IQOQI Vienna Institute. Host: Dr. Miguel Navascues (online)
- VCQ Colloquium, joint initiative of the University of Vienna, Vienna University of Technology, the Austrian Academy of Sciences, and the Institute of Science and Technology Austria. Host: Prof. Markus Aspelmeyer (online)
- Invited talk at DSR20, University of Naples (online)
- Seminar to the Mathematical Physics and Quantum Information Group at the University of York. Host: Dr. Matthew Pusey (online)
- Invited talk at the Workshop "Causality in the quantum world", Capri, Italy
- Invited talk at the Workshop "Observers in quantum gravity II", Naples, Italy
- Invited talk at the Conference "Quantum Information Revolution: Impact to Foundations", Växjö, Sweden
- Invited talk at the Workshop "New Directions in the Foundations of Physics", Viterbo, Italy
- Invited talk at the "Mini-Workshop on the Foundations of Quantum Mechanics", Vienna, Austria
- Invited talk at the "Quantum Maiwar Workshop", Brisbane, Australia
- Invited talk at the "Gravity in the quantum regime Workshop", Dartmouth College, Hanover (NH), USA
- Invited talk at the "Interplay of quantum information, foundations and gravity Workshop", Vienna, Austria
- Invited talk at the "Spacetime and Information Workshop", Manitoulin Island, Ontario, Canada
- PIRSA:21060124, Good-Bye and Closing Remarks, 2021-06-18, Quantizing Time
- PIRSA:21060120, Welcome and Opening Remarks, 2021-06-14, Quantizing Time
- PIRSA:21020014, Einstein's Equivalence principle for superpositions of gravitational fields, 2021-02-04, Quantum Gravity