Quantum Computing @ INFN

Session

Quantum Simulation

30 Oct 2024, 14:30

Padova

34. INVITED: Quantum Computing in theoretical HEP

Pietro Silvi (Istituto Nazionale di Fisica Nucleare)

30/10/2024, 14:30

10. Tensor Network methods for quantum circuit emulation, hybrid-architectures and quantum systems in non-Markovian regimes.

Dr Giuseppe Magnifico (University of Bari & INFN)

30/10/2024, 15:05

Tensor network methods have emerged as powerful tools for addressing complex challenges in quantum science, particularly supporting advances in quantum computing and technologies. In this talk, I will discuss recent developments in tensor network techniques across various domains. First, I will highlight how the integration of hyper-optimized contraction protocols into tensor network...

13. Fault-tolerant simulation of Lattice Gauge Theories with gauge covariant codes

Luca Spagnoli (Istituto Nazionale di Fisica Nucleare)

30/10/2024, 15:25

Quantum computers are a promising platforms to efficiently simulate systems hard to tackle on classical machines. An important challenge to overcome is the efficient control of errors that, if left undisturbed, make quantum simulations useless. A solution to this challenge is quantum error correction, that exploiting redundancy is able to correct errors. In this talk I will explore the...

32. Quantum Many-Body Scarring in a Non-Abelian Lattice Gauge Theory

Giovanni Cataldi (Istituto Nazionale di Fisica Nucleare)

30/10/2024, 15:45

Quantum many-body scarring (QMBS) is an intriguing mechanism of ergodicity breaking that has recently spurred significant attention. Particularly prominent in Abelian lattice gauge theories (LGTs), an open question is whether QMBS nontrivially arises in non-Abelian LGTs. Here, we present evidence of robust QMBS in a non-Abelian SU(2) LGT with dynamical matter. Starting in product states that...

15. Quantum simulation of strongly-correlated vortex phases with atoms in optical lattices

Marco Fedele Di Liberto (Istituto Nazionale di Fisica Nucleare)

30/10/2024, 16:45

We show that a viable route to generate strongly-interacting chiral phases can exploit the interplay between onsite interactions and flux frustration for bosons in dimerized lattices with pi-flux. By constructing an effective theory, we demonstrate how this setting favours the spontaneous breaking of time-reversal symmetry. This can lead to the realization of the long-sought chiral Mott...

9. Solving the homogeneous Bethe-Salpeter equation with a quantum annealer

Filippo Fornetti (Istituto Nazionale di Fisica Nucleare)

30/10/2024, 17:05

The homogeneous Bethe-Salpeter equation (hBSE) [1], which models a bound system within a fully relativistic quantum field theory, has been solved for the first time using a D-Wave quantum annealer [2]. Following standard discretization methods, the hBSE in the ladder approximation can be reformulated as a generalized eigenvalue problem (GEVP) involving two square matrices, one symmetric and...

22. Approximate inverse measurement channel for shallow shadows

Lorenzo Piroli (Istituto Nazionale di Fisica Nucleare)

30/10/2024, 17:25

Classical shadows are a versatile tool to probe many-qubit quantum systems, consisting of a
combination of randomised measurements and classical post-processing computations. In a recently
introduced version of the protocol, the randomization step is performed via unitary circuits of
variable depth t, defining the so-called shallow shadows. For sufficiently large t, this approach...

27. Neural quantum Monte Carlo algorithms for quantum simulators

Luca Brodoloni (School of Science and Technology, Physics Division, Univeristy of Camerino , 62032 Camerino, Italy)

30/10/2024, 17:45

Simulating the low-temperature properties of frustrated quantum Ising models is a paradigmatic problem in condensed matter physics. It has recently gained strong interest in the context of quantum-enhanced optimization performed via quantum annealers and of quantum simulation in Rydberg-atom experiments.
We use a recently-developed self-learning projection quantum Monte Carlo algorithm...

19. Exponential optimization of adiabatic quantum-state preparation

Davide Cugini

30/10/2024, 18:05

The preparation of a given quantum state on a quantum computing register is a typically demanding operation, requiring a number of elementary gates that scales exponentially with the size of the problem. In view of performing quantum simulations of manybody systems, this limitation might severely hinder the actual application of the noisy quantum processors that are currently available....

12. How to Measure Reflection and Transmission Amplitudes in a Digital Quantum Simulation

Mr Andrea Stampiggi (SISSA, INFN Sezione Trieste)

31/10/2024, 11:20

In recent years, much research has investigated the potentialities of quantum computers, ranging from physical implementations to comparisons with well-known algorithms of classical computation.
I would like to present a quantum algorithm to measure quantities related to scattering theory: reflection and transmission amplitudes of a quantum particle interacting with a short-ranged...

24. Boost Quantum TEA performance via flexible choices for numerical libraries

Daniel Jaschke (University of Ulm)

31/10/2024, 11:40

We benchmark Quantum TEA, a simulation framework developed as well with the support of the INFN quantum initiative and INFN infrastructure. Quantum TEA supports both digital, analog, and quantum-inspired quantum simulation on classical hardware. The simulations of many-body quantum systems run on heterogeneous hardware platforms using CPUs, GPUs, and TPUs. We compare different linear algebra...

26. Two interesting applications of stochastic unravelling in quantum computing

Sandro Donadi (Istituto Nazionale di Fisica Nucleare)

31/10/2024, 12:00

We present two examples of the application of stochastic calculus in quantum computing.
The first example involves simulating quantum circuits in the presence of noise using classical computers. Instead of directly solving the Lindblad master equation, we utilize its stochastic unravelling to model a random evolution of the state vector. This approach enables us to incorporate noise effects...

21. Optimisation of ultrafast singlet fission in 1D rings towards unit efficiency

Francesco Campaioli (Istituto Nazionale di Fisica Nucleare)

31/10/2024, 12:20

Singlet fission (SF) is an electronic transition that in the last decade has been under the spotlight for its applications in optoelectronics, from photovoltaics to spintronics. Despite considerable experimental and theoretical advancements, optimising SF in extended solids remains a challenge, due to the complexity of its analysis beyond perturbative methods. Here, we tackle the case of 1D...

25. Entanglement in finite-temperature Rydberg atom arrays

Nora Reinić (Istituto Nazionale di Fisica Nucleare)

31/10/2024, 12:40

Tensor network methods are a family of numerical techniques that efficiently compress the information of quantum many-body systems while accurately capturing their important physical properties. Here, we present a tensor-network-based toolbox developed for constructing the quantum many-body states at thermal equilibrium. Using this framework, we probe classical correlations as well as...

20. The role of non-stabilizerness in Bell’s inequality violation

Stefano Cusumano (Istituto Nazionale di Fisica Nucleare)

31/10/2024, 13:00

Bell’s inequality represent a cornerstone in our understanding of quantum theory, as they allow to prove the quantum mechanics is non-local and no hidden variable theory can give the same results.
While known to the community, it is often not highlighted the role of non-stabilizerness, often dubbed magic, in the violation of Bell’s inequalities.
In our work we show how much...