Vincenzo Savona

Biographie

De nationalité italienne, Vincenzo Savona est né en 1969. Il effectue ses études de physique à lEcole normale supérieure de Pise et à lUniversité de Pise. Puis il entreprend une thèse de doctorat à lInstitut de physique théorique de lEPFL. Il effectue des recherches post-doctorales à lEPFL, puis à lInstitut de physique de lUniversité Humboldt de Berlin. En 2002, il revient à lEPFL pour y constituer son groupe de recherche, bénéficiant dun subside «professeur boursier» du Fonds national suisse de la recherche scientifique. En 2006, il est nommé professeur assistant tenure-track à lEPFL et intègre le NCCR de photonique quantique. En 2010 il est nommé professeur associé. Actuellement, il dirige le Laboratoire de physique théorique des nanosystèmes.

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https://people.epfl.ch/vincenzo.savona?lang=fr

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Dissipative Kerr solitons arising from parametric gain in ring microresonators are usually described within a classical mean-field framework. Here, we develop a quantum-mechanical model of dissipative Kerr solitons in terms of the Lindblad master equation and study the model via the truncated Wigner method, which accounts for quantum effects to leading order. We show that, within this open quantum system framework, the soliton experiences a finite coherence time due to quantum fluctuations originating from losses. Reading the results in terms of the theory of open quantum systems allows us to estimate the Liouvillian spectrum of the system. It is characterized by a set of eigenvalues with a finite imaginary part and a vanishing real part in the limit of vanishing quantum fluctuations. This feature shows that dissipative Kerr solitons are a specific class of dissipative time crystals.

AMER PHYSICAL SOC2022

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Quantum error correction using squeezed Schrodinger cat states

Fabrizio Minganti, Vincenzo Savona, David Schlegel

Bosonic quantum codes redundantly encode quantum information in the states of a quantum harmonic oscillator, making it possible to detect and correct errors. Schrodinger cat codes-based on the superposition of two coherent states with opposite displacements-can correct phase-flip errors induced by dephasing, but they are vulnerable to bit-flip errors induced by particle loss. Here, we develop a bosonic quantum code relying on squeezed cat states, i.e., cat states made of a linear superposition of displaced-squeezed states. Squeezed cat states allow to partially correct errors caused by particle loss, while at the same time improving the protection against dephasing. We present a comprehensive analysis of the squeezed cat code, including protocols for code generation and elementary quantum gates. We characterize the effect of both particle loss and dephasing and develop an optimal recovery protocol that is suitable to be implemented on currently available quantum hardware. We show that with moderate squeezing, and using typical parameters of state-of-the-art quantum hardware platforms, the squeezed cat code has a resilience to particle loss errors that significantly outperforms that of the conventional cat code.

AMER PHYSICAL SOC2022

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A quantum algorithm for the direct estimation of the steady state of open quantum systems

Nathan Ramusat, Vincenzo Savona

Simulating the dynamics and the non-equilibrium steady state of an open quantum system are hard computational tasks on conventional computers. For the simulation of the time evolution, several efficient quantum algorithms have recently been developed. However, computing the non-equilibrium steady state as the long-time limit of the system dynamics is often not a viable solution, because of exceedingly long transient features or strong quantum correlations in the dynamics. Here, we develop an efficient quantum algorithm for the direct estimation of averaged expectation values of observables on the non-equilibrium steady state, thus bypassing the time integration of the master equation. The algorithm encodes the vectorized representation of the density matrix on a quantum register, and makes use of quantum phase estimation to approximate the eigenvector associated to the zero eigenvalue of the generator of the system dynamics. We show that the output state of the algorithm allows to estimate expectation values of observables on the steady state. Away from critical points, where the Liouvillian gap scales as a power law of the system size, the quantum algorithm performs with exponential advantage compared to exact diagonalization.

VEREIN FORDERUNG OPEN ACCESS PUBLIZIERENS QUANTENWISSENSCHAF2021

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Vincenzo Savona

L'onde de polarisation est

Quantum error correction using squeezed Schrodinger cat states

A quantum algorithm for the direct estimation of the steady state of open quantum systems

Quantum error correction using squeezed Schrodinger cat states

A quantum algorithm for the direct estimation of the steady state of open quantum systems