Diego Paiva Pires
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View article: Generalized entropic quantum speed limits
Generalized entropic quantum speed limits Open
We present a class of generalized entropic quantum speed limits based on $α$-$z$-Rényi relative entropy, a real-valued, contractive, two-parameter family of distinguishability measures. The quantum speed limit (QSL) falls into the class of…
View article: Experimental investigation of geometric quantum speed limits in an open quantum system
Experimental investigation of geometric quantum speed limits in an open quantum system Open
The quantum speed limit (QSL) is a fundamental lower bound on the evolution time for quantum systems, and its tightness has been observed to be dependent on the properties of the physical process. However, experimental studies exploring th…
View article: Quantum Speed Limits Based on Schatten Norms: Universality and Tightness
Quantum Speed Limits Based on Schatten Norms: Universality and Tightness Open
We discuss quantum speed limits (QSLs) for finite-dimensional quantum systems undergoing general physical processes. These QSLs were obtained using Schatten $α$-norms, firstly exploiting geometric features of the quantum state space, and s…
View article: Experimental Investigation of Geometric Quantum Speed Limits in an Open Quantum System
Experimental Investigation of Geometric Quantum Speed Limits in an Open Quantum System Open
We studied geometric quantum speed limits (QSL) of a qubit subject to decoherence in an ensemble of chloroform molecules in a Nuclear Magnetic Resonance experiment. The QSL is a fundamental lower bound on the evolution time for quantum sys…
View article: Fidelity-based distance bounds for $N$-qubit approximate quantum error correction
Fidelity-based distance bounds for $N$-qubit approximate quantum error correction Open
The Eastin-Knill theorem is a central result of quantum error correction theory and states that a quantum code cannot correct errors exactly, possess continuous symmetries, and implement a universal set of gates transversely. As a way to c…
View article: Mixedness timescale in non-Hermitian quantum systems
Mixedness timescale in non-Hermitian quantum systems Open
We discuss the short-time perturbative expansion of the linear entropy for finite-dimensional quantum systems whose dynamics can be effectively described by a non-Hermitian Hamiltonian. We derive a timescale for the degree of mixedness for…
View article: Unified entropies and quantum speed limits for nonunitary dynamics
Unified entropies and quantum speed limits for nonunitary dynamics Open
We discuss a class of quantum speed limits (QSLs) based on unified quantum ($α,μ$)-entropy for nonunitary physical processes. The bounds depend on both the Schatten speed and the smallest eigenvalue of the evolved state, and the two-parame…
View article: Dynamics of quantum resources in regular and Majorana fermion systems
Dynamics of quantum resources in regular and Majorana fermion systems Open
In recent years, the reassessment of quantum physical phenomena under the framework of resource theories has triggered the design of novel quantum technologies that take advantage from quantum resources, such as entanglement and quantum co…
View article: Relative purity, speed of fluctuations, and bounds on equilibration times
Relative purity, speed of fluctuations, and bounds on equilibration times Open
We discuss the local equilibration of closed systems using the relative purity, a paradigmatic information-theoretic distinguishability measure that finds applications ranging from quantum metrology to quantum speed limits. First we obtain…
View article: Probing phase transitions in non-Hermitian systems with multiple quantum coherences
Probing phase transitions in non-Hermitian systems with multiple quantum coherences Open
Understanding the interplay between quantum coherence and non-Hermitian\nfeatures would enable the devising of quantum technologies based on dissipative\nsystems. In turn, quantum coherence can be characterized in terms of the\nlanguage of…
View article: Bounding generalized relative entropies: Nonasymptotic quantum speed limits
Bounding generalized relative entropies: Nonasymptotic quantum speed limits Open
Information theory has become an increasingly important research field to better understand quantum mechanics. Noteworthy, it covers both foundational and applied perspectives, also offering a common technical language to study a variety o…
View article: Quantum coherence and speed limit in the mean-field Dicke model of superradiance
Quantum coherence and speed limit in the mean-field Dicke model of superradiance Open
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View article: Relating relative Rényi entropies and Wigner-Yanase-Dyson skew information to generalized multiple quantum coherences
Relating relative Rényi entropies and Wigner-Yanase-Dyson skew information to generalized multiple quantum coherences Open
Quantum coherence is a crucial resource for quantum information processing.\nBy employing the language of coherence orders largely applied in NMR systems,\nquantum coherence has been currently addressed in terms of multiple quantum\ncohere…
View article: Spin-orbit coupling in wurtzite heterostructures
Spin-orbit coupling in wurtzite heterostructures Open
Effective spin-orbit (SO) Hamiltonians for conduction electrons in wurtzite\nheterostructures are lacking in the literature, in contrast to zincblende\nstructures. Here we address this issue by deriving such an effective\nHamiltonian valid…
View article: Coherence orders, decoherence, and quantum metrology
Coherence orders, decoherence, and quantum metrology Open
Since the dawn of quantum theory, coherence was attributed as a key to\nunderstand the weirdness of fundamental concepts like the wave-particle duality\nand the Stern-Gerlach experiment. Recently, based on a resource theory\napproach, the …
View article: Generalized Geometric Quantum Speed Limits
Generalized Geometric Quantum Speed Limits Open
The attempt to gain a theoretical understanding of the concept of time in quantum mechanics has triggered significant progress towards the search for faster and more efficient quantum technologies. One of such advances consists in the inte…