Philippe Faist
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View article: Adversarial Thermodynamics
Adversarial Thermodynamics Open
In thermodynamics, an agent's ability to extract work is fundamentally constrained by their environment. Traditional frameworks struggle to capture how strategic decision-making under uncertainty, particularly an agent's tolerance for risk…
View article: Quantum Metrology in the Finite-Sample Regime
Quantum Metrology in the Finite-Sample Regime Open
In quantum metrology, a major application of quantum technologies, the ultimate precision of estimating an unknown parameter is often stated in terms of the Cramér-Rao bound. Yet, the latter fails to completely characterize the distributio…
View article: Complexity-Constrained Quantum Thermodynamics
Complexity-Constrained Quantum Thermodynamics Open
Quantum complexity measures the difficulty of realizing a quantum process, such as preparing a state or implementing a unitary. We present an approach to quantifying the thermodynamic resources required to implement a process if the proces…
View article: Quantum complexity phase transitions in monitored random circuits
Quantum complexity phase transitions in monitored random circuits Open
Recently, the dynamics of quantum systems that involve both unitary evolution and quantum measurements have attracted attention due to the exotic phenomenon of measurement-induced phase transitions. The latter refers to a sudden change in …
View article: Complexity-constrained quantum thermodynamics
Complexity-constrained quantum thermodynamics Open
Quantum complexity measures the difficulty of realizing a quantum process, such as preparing a state or implementing a unitary. We present an approach to quantifying the thermodynamic resources required to implement a process if the proces…
View article: Time-Energy Uncertainty Relation for Noisy Quantum Metrology
Time-Energy Uncertainty Relation for Noisy Quantum Metrology Open
102 pages (42+60), total 18 figures
View article: Quantum metrology in the finite-sample regime
Quantum metrology in the finite-sample regime Open
In quantum metrology, one of the major applications of quantum technologies, the ultimate precision of estimating an unknown parameter is often stated in terms of the Cramér-Rao bound. Yet, the latter is no longer guaranteed to carry an op…
View article: Quantum complexity phase transitions in monitored random circuits
Quantum complexity phase transitions in monitored random circuits Open
Recently, the dynamics of quantum systems that involve both unitary evolution and quantum measurements have attracted attention due to the exotic phenomenon of measurement-induced phase transitions. The latter refers to a sudden change in …
View article: Resource theory of quantum uncomplexity
Resource theory of quantum uncomplexity Open
Quantum complexity is emerging as a key property of many-body systems, including black holes, topological materials, and early quantum computers. A state's complexity quantifies the number of computational gates required to prepare the sta…
View article: Asymptotic reversibility of thermal operations for interacting quantum spin systems via generalized quantum Stein’s lemma
Asymptotic reversibility of thermal operations for interacting quantum spin systems via generalized quantum Stein’s lemma Open
For quantum spin systems in any spatial dimension with a local, translation-invariant Hamiltonian, we prove that asymptotic state convertibility from a quantum state to another one by a thermodynamically feasible class of quantum dynamics,…
View article: Resource theory of quantum uncomplexity
Resource theory of quantum uncomplexity Open
Quantum complexity is emerging as a key property of many-body systems, including black holes, topological materials, and early quantum computers. A state's complexity quantifies the number of computational gates required to prepare the sta…
View article: Thermodynamic Implementations of Quantum Processes
Thermodynamic Implementations of Quantum Processes Open
Recent understanding of the thermodynamics of small-scale systems have enabled the characterization of the thermodynamic requirements of implementing quantum processes for fixed input states. Here, we extend these results to construct opti…
View article: Time-energy uncertainty relation for noisy quantum metrology
Time-energy uncertainty relation for noisy quantum metrology Open
We derive a fundamental trade-off relating the accuracy loss of a quantum clock due to a noise channel to the information about the energy of the clock that leaks to the environment.
View article: Continuous Symmetries and Approximate Quantum Error Correction
Continuous Symmetries and Approximate Quantum Error Correction Open
Quantum error correction and symmetry arise in many areas of physics, including many-body systems, metrology in the presence of noise, fault-tolerant computation, and holographic quantum gravity. Here, we study the compatibility of these t…
View article: The first law of general quantum resource theories
The first law of general quantum resource theories Open
We extend the tools of quantum resource theories to scenarios in which multiple quantities (or resources) are present, and their interplay governs the evolution of physical systems. We derive conditions for the interconversion of these res…
View article: Macroscopic Thermodynamic Reversibility in Quantum Many-Body Systems
Macroscopic Thermodynamic Reversibility in Quantum Many-Body Systems Open
The resource theory of thermal operations, an established model for small-scale thermodynamics, provides an extension of equilibrium thermodynamics to nonequilibrium situations. On a lattice of any dimension with any translation-invariant …
View article: Asymptotic Reversibility of Thermal Operations for Interacting Quantum Spin Systems via Generalized Quantum Stein's Lemma
Asymptotic Reversibility of Thermal Operations for Interacting Quantum Spin Systems via Generalized Quantum Stein's Lemma Open
For quantum spin systems in any spatial dimension with a local, translation-invariant Hamiltonian, we prove that asymptotic state convertibility from a quantum state to another one by a thermodynamically feasible class of quantum dynamics,…
View article: Macroscopic Thermodynamic Reversibility in Quantum Many-Body Systems
Macroscopic Thermodynamic Reversibility in Quantum Many-Body Systems Open
The resource theory of thermal operations, an established model for small-scale thermodynamics, provides an extension of equilibrium thermodynamics to nonequilibrium situations. On a lattice of any dimension with any translation-invariant …
View article: Thermodynamic Capacity of Quantum Processes
Thermodynamic Capacity of Quantum Processes Open
Thermodynamics imposes restrictions on what state transformations are possible. In the macroscopic limit of asymptotically many independent copies of a state-as for instance in the case of an ideal gas-the possible transformations become r…
View article: Practical and reliable error bars for quantum process tomography
Practical and reliable error bars for quantum process tomography Open
Current techniques in quantum process tomography typically return a single point estimate of an unknown process based on a finite albeit large amount of measurement data. Due to statistical fluctuations, however, other processes close to t…
View article: Fundamental Work Cost of Quantum Processes
Fundamental Work Cost of Quantum Processes Open
Information-theoretic approaches provide a promising avenue for extending the laws of thermodynamics to the nanoscale. Here, we provide a general fundamental lower limit, valid for systems with an arbitrary Hamiltonian and in contact with …
View article: Quantum Thermodynamics with Multiple Conserved Quantities
Quantum Thermodynamics with Multiple Conserved Quantities Open
In this chapter we address the topic of quantum thermodynamics in the presence of additional observables beyond the energy of the system. In particular we discuss the special role that the generalized Gibbs ensemble plays in this theory, a…
View article: Axiomatic Relation between Thermodynamic and Information-Theoretic Entropies
Axiomatic Relation between Thermodynamic and Information-Theoretic Entropies Open
Thermodynamic entropy, as defined by Clausius, characterizes macroscopic observations of a system based on phenomenological quantities such as temperature and heat. In contrast, information-theoretic entropy, introduced by Shannon, is a me…
View article: tomographer: Tomographer v2.0
tomographer: Tomographer v2.0 Open
This release introduces only minor improvements to the main tomorun program, but now the framework has a revised API and it is better organized, more consistently named and more flexible. Please read http://tomographer.github.io/tomographe…
View article: Quantum Coarse-Graining: An Information-Theoretic Approach to Thermodynamics
Quantum Coarse-Graining: An Information-Theoretic Approach to Thermodynamics Open
We investigate fundamental connections between thermodynamics and quantum information theory. First, we show that the operational framework of thermal operations is nonequivalent to the framework of Gibbs-preserving maps, and we comment on…
View article: Practical and Reliable Error Bars in Quantum Tomography
Practical and Reliable Error Bars in Quantum Tomography Open
Precise characterization of quantum devices is usually achieved with quantum tomography. However, most methods which are currently widely used in experiments, such as maximum likelihood estimation, lack a well-justified error analysis. Pro…
View article: Quantum Coarse-Graining: An Information-theoretic Approach to thermodynamics
Quantum Coarse-Graining: An Information-theoretic Approach to thermodynamics Open
We investigate fundamental connections between thermodynamics and quantum information theory. First, we show that the operational framework of thermal operations is nonequivalent to the framework of Gibbs-preserving maps, and we comment on…