Mark T. Mitchison
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View article: Entropic Costs of Extracting Classical Ticks from a Quantum Clock
Entropic Costs of Extracting Classical Ticks from a Quantum Clock Open
We experimentally realize a quantum clock by using a charge sensor to count charges tunneling through a double quantum dot (DQD). Individual tunneling events are used as the clock’s ticks. We quantify the clock’s precision while measuring …
View article: Current-based metrology with two-terminal mesoscopic conductors
Current-based metrology with two-terminal mesoscopic conductors Open
The traditional approach to quantum parameter estimation focuses on the quantum state, deriving fundamental bounds on precision through the quantum Fisher information. In most experimental settings, however, performing arbitrary quantum me…
View article: Correlated decoherence and thermometry with mobile impurities in a 1D Fermi gas
Correlated decoherence and thermometry with mobile impurities in a 1D Fermi gas Open
We theoretically investigate the correlated decoherence dynamics of two mobile impurities trapped within a gas of ultracold fermionic atoms. We use a mean-field approximation to self-consistently describe the effect of impurity-gas collisi…
View article: Current-based metrology with two-terminal mesoscopic conductors
Current-based metrology with two-terminal mesoscopic conductors Open
The traditional approach to quantum parameter estimation focuses on the quantum state, deriving fundamental bounds on precision through the quantum Fisher information. In most experimental settings, however, performing arbitrary quantum me…
View article: Rapid optimal work extraction from a quantum-dot information engine
Rapid optimal work extraction from a quantum-dot information engine Open
The conversion of thermal energy into work is usually more efficient in the slow-driving regime, where the power output is vanishingly small. Efficient work extraction for fast-driving protocols remains an outstanding challenge at the nano…
View article: Rapid optimal work extraction from a quantum-dot information engine
Rapid optimal work extraction from a quantum-dot information engine Open
The conversion of thermal energy into work is usually more efficient in the slow-driving regime, where the power output is vanishingly small. Efficient work extraction for fast-driving protocols remains an outstanding challenge at the nano…
View article: Quantum master equation from the eigenstate thermalization hypothesis
Quantum master equation from the eigenstate thermalization hypothesis Open
We use the eigenstate thermalization hypothesis to derive a quantum master equation for a system that is weakly coupled to a chaotic finite-sized bath prepared in a pure state. We show that the emergence of Markovianity is controlled by th…
View article: Quantum stochastic thermodynamics in the mesoscopic-leads formulation
Quantum stochastic thermodynamics in the mesoscopic-leads formulation Open
We introduce a numerical method to sample the distributions of charge, heat, and entropy production in open quantum systems coupled strongly to macroscopic reservoirs, with both temporal and energy resolution and beyond the linear-response…
View article: Precision bounds for multiple currents in open quantum systems
Precision bounds for multiple currents in open quantum systems Open
Thermodynamic (TUR) and kinetic (KUR) uncertainty relations are fundamental bounds constraining the fluctuations of current observables in classical, nonequilibrium systems. Several works have verified, however, violations of these classic…
View article: Precision bounds for multiple currents in open quantum systems
Precision bounds for multiple currents in open quantum systems Open
Thermodynamic (TUR) and kinetic (KUR) uncertainty relations are fundamental bounds constraining the fluctuations of current observables in classical, nonequilibrium systems. Several works have verified, however, violations of these classic…
View article: Steady-state heat engines driven by finite reservoirs
Steady-state heat engines driven by finite reservoirs Open
We provide a consistent thermodynamic analysis of stochastic thermal engines driven by finite-size reservoirs, which are in turn coupled to infinite-size reservoirs. We consider a cyclic operation mode, where the working medium couples seq…
View article: Roadmap on Quantum Thermodynamics
Roadmap on Quantum Thermodynamics Open
The last two decades has seen quantum thermodynamics become a well established field of research in its own right. In that time, it has demonstrated a remarkably broad applicability, ranging from providing foundational advances in the unde…
View article: Heat operator approach to quantum stochastic thermodynamics in the strong-coupling regime
Heat operator approach to quantum stochastic thermodynamics in the strong-coupling regime Open
Heat exchanged between an open quantum system and its environment exhibits fluctuations that carry crucial signatures of the underlying dynamics. Within the well-established two-point measurement scheme, we identify a 'heat operator,' whos…
View article: MetaSym: A Symplectic Meta-learning Framework for Physical Intelligence
MetaSym: A Symplectic Meta-learning Framework for Physical Intelligence Open
Scalable and generalizable physics-aware deep learning has long been considered a significant challenge with various applications across diverse domains ranging from robotics to molecular dynamics. Central to almost all physical systems ar…
View article: Diagnosing chaos with projected ensembles of process tensors
Diagnosing chaos with projected ensembles of process tensors Open
The process tensor provides a general representation of a quantum system evolving under repeated interventions and is fundamental for numerical simulations of local many-body dynamics. In this work, we introduce the projected process ensem…
View article: Quantum feedback control with a transformer neural network architecture
Quantum feedback control with a transformer neural network architecture Open
Attention-based neural networks such as transformers have revolutionized various fields such as natural language processing, genomics, and vision. Here, we demonstrate the use of transformers for quantum feedback control through a supervis…
View article: Entanglement signature in quantum work statistics in the slow-driving regime
Entanglement signature in quantum work statistics in the slow-driving regime Open
In slowly driven classical systems, work is a stochastic quantity and its probability distribution is known to satisfy the work fluctuation-dissipation relation, which states that the mean and variance of the dissipated work are linearly r…
View article: Optimal time estimation and the clock uncertainty relation for stochastic processes
Optimal time estimation and the clock uncertainty relation for stochastic processes Open
Time estimation is a fundamental task that underpins precision measurement, global navigation systems, financial markets, and the organisation of everyday life. Many biological processes also depend on time estimation by nanoscale clocks, …
View article: Entanglement signature in quantum work statistics in the slow-driving regime
Entanglement signature in quantum work statistics in the slow-driving regime Open
In slowly driven classical systems, work is a stochastic quantity and its probability distribution is known to satisfy the work fluctuation-dissipation relation, which states that the mean and variance of the dissipated work are linearly r…
View article: Quantum stochastic thermodynamics in the mesoscopic-leads formulation
Quantum stochastic thermodynamics in the mesoscopic-leads formulation Open
We introduce a numerical method to sample the distributions of charge, heat, and entropy production in open quantum systems coupled strongly to macroscopic reservoirs, with both temporal and energy resolution and beyond the linear-response…
View article: Current Fluctuations in Open Quantum Systems: Bridging the Gap Between Quantum Continuous Measurements and Full Counting Statistics
Current Fluctuations in Open Quantum Systems: Bridging the Gap Between Quantum Continuous Measurements and Full Counting Statistics Open
Continuously measured quantum systems are characterized by an output current, in the form of a stochastic and correlated time series, which conveys crucial information about the underlying quantum system. The many tools used to describe cu…
View article: Calculating the many-body density of states on a digital quantum computer
Calculating the many-body density of states on a digital quantum computer Open
Quantum statistical mechanics allows us to extract thermodynamic information from a microscopic description of a many-body system. A key step is the calculation of the density of states, from which the partition function and all finite-tem…
View article: Powering an autonomous clock with quantum electromechanics
Powering an autonomous clock with quantum electromechanics Open
We theoretically analyse an autonomous clock comprising a nanoelectromechanical system, which undergoes self-oscillations driven by electron tunnelling. The periodic mechanical motion behaves as the clockwork, similar to the swinging of a …
View article: Entropy production in the mesoscopic-leads formulation of quantum thermodynamics
Entropy production in the mesoscopic-leads formulation of quantum thermodynamics Open
Understanding the entropy production of systems strongly coupled to thermal baths is a core problem of both quantum thermodynamics and mesoscopic physics. While there exist many techniques to accurately study entropy production in such sys…
View article: Thermometry by correlated dephasing of impurities in a 1D Fermi gas
Thermometry by correlated dephasing of impurities in a 1D Fermi gas Open
We theoretically investigate the pure dephasing dynamics of two static impurity qubits embedded within a common environment of ultracold fermionic atoms, which are confined to one spatial dimension. Our goal is to understand how bath-media…
View article: Powering an autonomous clock with quantum electromechanics
Powering an autonomous clock with quantum electromechanics Open
We theoretically analyse an autonomous clock comprising a nanoelectromechanical system, which undergoes self-oscillations driven by electron tunnelling. The periodic mechanical motion behaves as the clockwork, similar to the swinging of a …
View article: Thermodynamics of decoherence
Thermodynamics of decoherence Open
We investigate the non-equilibrium thermodynamics of pure decoherence. In a pure decoherence process, the system Hamiltonian is a constant of motion and there is no direct energy exchange between the system and its surroundings. Neverthele…
View article: Calculating the many-body density of states on a digital quantum computer
Calculating the many-body density of states on a digital quantum computer Open
Quantum statistical mechanics allows us to extract thermodynamic information from a microscopic description of a many-body system. A key step is the calculation of the density of states, from which the partition function and all finite-tem…
View article: Current fluctuations in open quantum systems: Bridging the gap between quantum continuous measurements and full counting statistics
Current fluctuations in open quantum systems: Bridging the gap between quantum continuous measurements and full counting statistics Open
Continuously measured quantum systems are characterized by an output current, in the form of a stochastic and correlated time series which conveys crucial information about the underlying quantum system. The many tools used to describe cur…
View article: The Impact of Imperfect Timekeeping on Quantum Control
The Impact of Imperfect Timekeeping on Quantum Control Open
In order to unitarily evolve a quantum system, an agent requires knowledge of time, a parameter which no physical clock can ever perfectly characterise. In this letter, we study how limitations on acquiring knowledge of time impact control…