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Noisy gates for simulating quantum computers
/ Di Bartolomeo, Giovanni (Trieste U. ; INFN, Trieste) ; Vischi, Michele (Trieste U. ; INFN, Trieste) ; Cesa, Francesco (Trieste U. ; INFN, Trieste) ; Wixinger, Roman (Zurich, ETH) ; Grossi, Michele (CERN) ; Donadi, Sandro (INFN, Trieste) ; Bassi, Angelo (Trieste U. ; INFN, Trieste)
We present a novel method for simulating the noisy behaviour of quantum computers, which allows to efficiently incorporate environmental effects in the driven evolution implementing the gates acting on the qubits. We show how to modify the noiseless gate executed by the computer to include any Markovian noise, hence resulting in what we will call a noisy gate. [...]
arXiv:2301.04173.-
2023-12-06 - 19 p.
- Published in : Phys. Rev. Res. 5 (2023) 043210
Fulltext: 2301.04173 - PDF; Publication - PDF;
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Spontaneous collapse models lead to the emergence of classicality of the Universe
/ Gaona-Reyes, José Luis (Trieste U. ; INFN, Trieste) ; Menéndez-Pidal, Lucía (Madrid U.) ; Faizal, Mir (British Columbia U., Okanagan ; CQRC, Vernon ; CERN) ; Carlesso, Matteo (Trieste U. ; INFN, Trieste ; Queen's U., Belfast)
Assuming that Quantum Mechanics is universal and that it can be applied over all scales, then the Universe is allowed to be in a quantum superposition of states, where each of them can correspond to a different space-time geometry. How can one then describe the emergence of the classical, well-defined geometry that we observe? Considering that the decoherence-driven quantum-to-classical transition relies on external physical entities, this process cannot account for the emergence of the classical behaviour of the Universe. [...]
arXiv:2401.08269.-
2024-02-23 - 17 p.
- Published in : JHEP 2402 (2024) 193
Fulltext: 2401.08269 - PDF; Publication - PDF;
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Wide-angle effects in the galaxy bispectrum
/ Pardede, Kevin (SISSA, Trieste ; ICTP, Trieste ; IFPU, Trieste ; INFN, Trieste ; Trieste Observ.) ; Di Dio, Enea (CERN) ; Castorina, Emanuele (Milan U.)
Primordial non-Gaussianities (PNG) leave unique signatures in the bispectrum of the large-scale structure. With upcoming galaxy surveys set to improve PNG constraints by at least one order of magnitude, it is important to account for any potential contamination. [...]
arXiv:2302.12789; CERN-TH-2023-033.-
2023-09-14 - 27 p.
- Published in : JCAP 2309 (2023) 030
Fulltext: 2302.12789 - PDF; document - PDF;
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The Physical Squeezed Limit: Consistency Relations at Order q^2
/ Creminelli, Paolo (ICTP, Trieste) ; Perko, Ashley (Stanford U., ITP) ; Senatore, Leonardo (Stanford U., ITP ; KIPAC, Menlo Park ; SLAC ; CERN) ; Simonović, Marko (SISSA, Trieste ; INFN, Trieste) ; Trevisan, Gabriele (SISSA, Trieste ; INFN, Trieste)
In single-field models of inflation the effect of a long mode with momentum q reduces to a diffeomorphism at zeroth and first order in q. This gives the well-known consistency relations for the n-point functions. [...]
arXiv:1307.0503.-
2013-11-07 - 18 p.
- Published in : JCAP 11 (2013) 015
Fulltext: PDF; External link: Preprint
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Bell inequalities and quantum entanglement in weak gauge boson production at the LHC and future colliders
/ Fabbrichesi, Marco (INFN, Trieste) ; Floreanini, Roberto (INFN, Trieste) ; Gabrielli, Emidio (Trieste U. ; INFN, Trieste ; NICPB, Tallinn) ; Marzola, Luca (NICPB, Tallinn)
Quantum entanglement of weak interaction gauge bosons produced at colliders can be explored by computing the corresponding polarization density matrix. To this end, we consider the Higgs boson decays $H\to W W^*$ and $H\to Z Z^*$, in which $W^*$ and $Z^*$ are off-shell states, and the $WW$, $WZ$ and $ZZ$ di-boson production in proton collisions. [...]
arXiv:2302.00683.-
2023-09-15 - 37 p.
- Published in : Eur. Phys. J. C 83 (2023) 823
Fulltext: document - PDF; 2302.00683 - PDF;
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