Dario Tamascelli
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View article: Full microscopic simulations uncover persistent quantum effects in primary photosynthesis
Full microscopic simulations uncover persistent quantum effects in primary photosynthesis Open
The presence of quantum effects in photosynthetic excitation energy transfer has been intensely debated over the past decade. Nonlinear spectroscopy cannot unambiguously distinguish coherent electronic dynamics from underdamped vibrational…
View article: Spectral density modulation and universal Markovian closure of fermionic environments
Spectral density modulation and universal Markovian closure of fermionic environments Open
The combination of chain-mapping and tensor-network techniques provides a powerful tool for the numerically exact simulation of open quantum systems interacting with structured environments. However, these methods suffer from a quadratic s…
View article: Spectral Density Modulation and Universal Markovian Closure of Fermionic Environments
Spectral Density Modulation and Universal Markovian Closure of Fermionic Environments Open
The combination of chain-mapping and tensor-network techniques provides a powerful tool for the numerically exact simulation of open quantum systems interacting with structured environments. However, these methods suffer from a quadratic s…
View article: Thermal cycle and polaron formation in structured bosonic environments
Thermal cycle and polaron formation in structured bosonic environments Open
12+3 pages, 16+1 figures
View article: Thermal cycle and polaron formation in structured bosonic environments
Thermal cycle and polaron formation in structured bosonic environments Open
Chain-mapping techniques combined with the time-dependent density matrix renormalization group are powerful tools for simulating the dynamics of open quantum systems interacting with structured bosonic environments. Most interestingly, the…
View article: Systematic coarse-graining of environments for the non-perturbative simulation of open quantum systems
Systematic coarse-graining of environments for the non-perturbative simulation of open quantum systems Open
Conducting precise electronic-vibrational dynamics simulations of molecular systems poses significant challenges when dealing with realistic environments composed of numerous vibrational modes. Here, we introduce a technique for the constr…
View article: Non-Perturbative Treatment of Open-System Multi-Time Expectation Values in Gaussian Bosonic Environments
Non-Perturbative Treatment of Open-System Multi-Time Expectation Values in Gaussian Bosonic Environments Open
We determine the conditions for the equivalence between the multi-time expectation values of a general finite-dimensional open quantum system when interacting with, respectively, an environment undergoing a free unitary evolution or a disc…
View article: Fingerprint and Universal Markovian Closure of Structured Bosonic Environments
Fingerprint and Universal Markovian Closure of Structured Bosonic Environments Open
We exploit the properties of chain mapping transformations of bosonic environments to identify a finite collection of modes able to capture the characteristic features, or fingerprint, of the environment. Moreover we show that the countabl…
View article: Spin-Dependent Momentum Conservation of Electron-Phonon Scattering in Chirality-Induced Spin Selectivity
Spin-Dependent Momentum Conservation of Electron-Phonon Scattering in Chirality-Induced Spin Selectivity Open
The elucidation of the mechanisms behind chiral-induced spin selectivity remains an outstanding scientific challenge. Here we consider the role of delocalised phonon modes in electron transport in chiral structures and demonstrate that spi…
View article: Fingerprint and universal Markovian closure of structured bosonic environments
Fingerprint and universal Markovian closure of structured bosonic environments Open
We exploit the properties of chain mapping transformations of bosonic environments to identify a finite collection of modes able to capture the characteristic features, or fingerprint, of the environment. Moreover we show that the countabl…
View article: Multiparameter quantum metrology with discrete-time quantum walks
Multiparameter quantum metrology with discrete-time quantum walks Open
We address multi-parameter quantum estimation for one-dimensional discrete-time quantum walks and its applications to quantum metrology. We use the quantum walker as a probe for unknown parameters encoded on its coin degrees of freedom. We…
View article: Learning Feedback Control Strategies for Quantum Metrology
Learning Feedback Control Strategies for Quantum Metrology Open
We consider the problem of frequency estimation for a single bosonic field\nevolving under a squeezing Hamiltonian and continuously monitored via homodyne\ndetection. In particular, we exploit reinforcement learning techniques to\ndevise f…
View article: Quantum Spatial Search in Two-Dimensional Waveguide Arrays
Quantum Spatial Search in Two-Dimensional Waveguide Arrays Open
Continuous-time quantum walks (CTQWs) have shown the capability to perform efficiently the spatial search of a marked site on many kinds of graphs. However, most of such graphs are hard to realize in an experimental setting. Here we study …
View article: Quantum spatial search in three-dimensional waveguide arrays
Quantum spatial search in three-dimensional waveguide arrays Open
Continuous-time quantum walks (CTQW) have shown the capability to perform efficiently the spatial search of a marked site on many kinds of graphs. However, most of such graphs are hard to realize in an experimental setting. Here we study C…
View article: Excitation dynamics in chain-mapped environments
Excitation dynamics in chain-mapped environments Open
The chain mapping of structured environments is a most powerful tool for the simulation of open quantum system dynamics. Once the environmental bosonic or fermionic degrees of freedom are unitarily rearranged into a one dimensional structu…
View article: Noisy Quantum Metrology Enhanced by Continuous Nondemolition Measurement
Noisy Quantum Metrology Enhanced by Continuous Nondemolition Measurement Open
We show that continuous quantum nondemolition (QND) measurement of an atomic ensemble is able to improve the precision of frequency estimation even in the presence of independent dephasing acting on each atom. We numerically simulate the d…
View article: Quantum probing beyond pure dephasing
Quantum probing beyond pure dephasing Open
Quantum probing is the art of exploiting simple quantum systems interacting with a complex environment to extract precise information about some environmental parameters, e.g. the temperature of the environment or its spectral density. Her…
View article: Optimized auxiliary oscillators for the simulation of general open quantum systems
Optimized auxiliary oscillators for the simulation of general open quantum systems Open
A method for the systematic construction of few-body damped harmonic\noscillator networks accurately reproducing the effect of general bosonic\nenvironments in open quantum systems is presented. Under the sole assumptions\nof a Gaussian en…
View article: Continuous Measurements for Advanced Quantum Metrology
Continuous Measurements for Advanced Quantum Metrology Open
We review some recent results regarding the use of time-continuous measurements for quantum-enhanced metrology. First, we present the underlying quantum estimation framework and elucidate the correct figures of merit to employ. We then rep…
View article: Experimental investigation of the effect of classical noise on quantum non-Markovian dynamics
Experimental investigation of the effect of classical noise on quantum non-Markovian dynamics Open
We provide an experimental study of the relationship between the action of different classical noises on the dephasing dynamics of a two-level system and the non-Markovianity of the quantum dynamics. The two-level system is encoded in the …
View article: Reinforcement Learning Based Control of Coherent Transport by Adiabatic Passage of Spin Qubits
Reinforcement Learning Based Control of Coherent Transport by Adiabatic Passage of Spin Qubits Open
Several tasks involving the determination of the time evolution of a system of solid state qubits require stochastic methods in order to identify the best sequence of gates and the time of interaction among the qubits. The major success of…
View article: Efficient Simulation of Finite-Temperature Open Quantum Systems
Efficient Simulation of Finite-Temperature Open Quantum Systems Open
Chain-mapping techniques in combination with the time-dependent density matrix renormalization group are a powerful tool for the simulation of open-system quantum dynamics. For finite-temperature environments, however, this approach suffer…
View article: Which-way interference within ringlike unit cells for efficient energy transfer
Which-way interference within ringlike unit cells for efficient energy transfer Open
We show that `which-way' interference within unit-cells enhances the\npropagation along linear arrays made upon these basic units. As a working\nexample, we address the exciton transfer through linear aggregates of ring-like\nunit cells, t…
View article: Precursors of non-Markovianity
Precursors of non-Markovianity Open
Using the paradigm of information backflow to characterize a non-Markovian evolution, we introduce so-called precursors of non-Markovianity, i.e. necessary properties that the system and environment state must exhibit at earlier times in o…
View article: Detection of squeezed light with glass-integrated technology embedded into a homodyne detector setup
Detection of squeezed light with glass-integrated technology embedded into a homodyne detector setup Open
We design and demonstrate a homodyne detection scheme based on a glass-integrated optical device (GID) operating in the quantum regime, that is, able to detect genuine nonclassical features. Our device is entirely fabricated by femtosecond…
View article: A trapped-ion simulator for spin-boson models with structured environments
A trapped-ion simulator for spin-boson models with structured environments Open
We propose a method to simulate the dynamics of spin-boson models with small crystals of trapped ions where the electronic degree of freedom of one ion is used to encode the spin while the collective vibrational degrees of freedom are empl…
View article: Probabilistic low-rank factorization accelerates tensor network simulations of critical quantum many-body ground states
Probabilistic low-rank factorization accelerates tensor network simulations of critical quantum many-body ground states Open
We provide evidence that randomized low-rank factorization is a powerful tool for the determination of the ground-state properties of low-dimensional lattice Hamiltonians through tensor network techniques. In particular, we show that rando…
View article: Non-Markovianity by undersampling in quantum optical simulators
Non-Markovianity by undersampling in quantum optical simulators Open
We unveil a novel source of non-Markovianity for the dynamics of quantum systems, which appears when the system does not explore the full set of dynamical trajectories in the interaction with its environment. We term this effect non-Markov…
View article: Simulating spin-boson models with trapped ions
Simulating spin-boson models with trapped ions Open
We propose a method to simulate the dynamics of spin-boson models with small crystals of trapped ions where the electronic degree of freedom of one ion is used to encode the spin while the collective vibrational degrees of freedom are empl…
View article: Characterization of qubit chains by Feynman probes
Characterization of qubit chains by Feynman probes Open
We address the characterization of qubit chains and assess the performances of local measurements compared to those provided by Feynman probes, i.e. nonlocal measurements realized by coupling a single qubit regis- ter to the chain. We show…