Article
Physics, Multidisciplinary
Jin-Fu Chen, Ying Li, Hui Dong
Summary: The paper introduces a piecewise control scheme to measure the performed work in finite-time isothermal processes in quantum-heat-engine cycles, and demonstrates the feasibility of this method through direct simulation on a universal quantum computer.
Article
Materials Science, Multidisciplinary
Ana Laura Gramajo, Elisabetta Paladino, Jukka Pekola, Rosario Fazio
Summary: Using a stochastic approach, we investigate the impact of system coherences on the fluctuation behavior of a thermal machine. Heat exchange with the cold bath leads to increased system instabilities, while coupling with the hot bath improves cycle precision and reduces thermodynamic fluctuations below the classical bound. Coherence suppression not only restores cycle cooling but also enhances the convergence of fluctuation relations by increasing entropy production. Our findings shed light on thermodynamic relations at the stochastic level, despite the simplicity of our model.
Article
Multidisciplinary Sciences
Tomas Opatrny, Simon Brauer, Abraham G. Kofman, Avijit Misra, Nilakantha Meher, Ofer Firstenberg, Eilon Poem, Gershon Kurizki
Summary: We propose heat machines that are nonlinear, coherent, and closed systems composed of few field modes. These machines can transform thermal-state input into nonthermal output with controlled quantum fluctuations, providing an output with reduced uncertainty that may be useful for sensing or communications in the quantum domain. They can be realized in optomechanical cavities or cold gases where interactions between photons or atoms are utilized.
Article
Optics
Yuqiang Ding, Feng Ding, Xueyuan Hu
Summary: The study confirmed that there are different laws of state conversions between thermal operations and enhanced thermal operations, and that a state transition induced by the latter cannot be approximately realized by the former. This contributes to the research on restrictions on coherence dynamics in quantum thermodynamics.
Article
Optics
A. Hovhannisyan, V Stepanyan, A. E. Allahverdyan
Summary: Linear optics imposes a more general relation than the second law of thermodynamics. For optical modes undergoing linear evolution, the photon number does not decrease if the evolution starts from a generalized diagonal state. This relation also holds for a wide range of initial states and leads to an increase in the Bose entropy of the modes. Nonlinear interactions between the modes can reverse the heating process and achieve cooling, decreasing the photon number and related noise in an equilibrium system of modes with different frequencies.
Article
Quantum Science & Technology
Pavel Sekatski, Marti Perarnau-Llobet
Summary: This paper investigates the minimum time required for temperature measurement and provides bounds on the achievable measurement precision. It also highlights the role of Lamb shift induced by the probe-sample interaction in thermometry.
Article
Physics, Multidisciplinary
Jingyi Chen, Youlin Wang, Guozhen Su, Jincan Chen, Shanhe Su
Summary: The general expressions of heat and work are derived using two representations of quantum mechanics. Quantum coherence, associated with the superposition of basis vectors, is shown to be essential in thermodynamics. Coherence work generates the power in the spin precession process, while coherence heat mainly determines the heat in the spontaneous emission process. These results establish a fundamental framework for finding thermodynamic relations in quantum evolution processes.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2023)
Article
Physics, Fluids & Plasmas
Sandipan Mohanta, Sushant Saryal, Bijay Kumar Agarwalla
Summary: We demonstrate a hierarchy in the relative fluctuation of currents for cold, hot, and work terminals in steady-state autonomous absorption refrigerators. This hierarchy leads to a bound on cooling efficiency that is tighter than previously obtained bounds.
Article
Physics, Multidisciplinary
Alberto Rolandi, Marti Perarnau-Llobet, Harry J. D. Miller
Summary: To achieve efficient and reliable control of microscopic systems, it is important to find driving protocols that minimize both average dissipation and stochastic fluctuations in work. In rapidly driven classical and quantum systems, we have characterized these optimal protocols, showing that they involve two discontinuous jumps in the full set of control variables. These jumps can be adjusted to interpolate between processes with minimal dissipation or minimal fluctuations, and sometimes allow for simultaneous minimization. We have demonstrated our general results using rapidly driven closed quantum systems, classical bit erasure, and a dissipative Ising chain driven close to a quantum phase transition.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Antoine Rignon-Bret, Giacomo Guarnieri, John Goold, Mark T. Mitchison
Summary: This study explores the thermodynamics of precision for small thermal machines in the quantum regime, deriving exact relations between power, power fluctuations, and entropy production rate. Quantum coherence can both help and hinder power fluctuations, and design principles for reducing fluctuations in quantum nanomachines are discussed. The proposed autonomous three-qubit engine has a more reliable power output for a given entropy production than any classical Markovian model would allow.
Article
Quantum Science & Technology
Wei-Hao Huang, Shih-Hsuan Chen, Chun-Hao Chang, Tzu-Liang Hsu, Kuan-Jou Wang, Che-Ming Li
Summary: EPR steering and Bell nonlocality are two different types of correlations predicted by quantum mechanics, which have motivated the exploration of quantum mechanics and become important resources for quantum-information processing. This study introduces a method for characterizing the creation of EPR steering and Bell nonlocality in dynamical processes, allowing the quantification and identification of the capability of experimental processes to create quantum correlations. The method is demonstrated using controlled-phase operations on IBM Quantum Experience and Amazon Braket Rigetti superconducting quantum computers, providing a useful diagnostic tool for evaluating nonclassical correlation creation in noisy intermediate scale quantum devices.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Multidisciplinary
Felipe Barra, Karen Hovhannisyan, Alberto Imparato
Summary: This paper introduces and studies a cyclic battery-charger quantum device that is in thermal equilibrium or in a ground state during the charge storing stage. The study shows that the extracted energy and thermodynamic efficiency can be enhanced by operating the cycle close to the quantum phase transition point. The performance of the device is further optimized by leveraging the correlations between the battery and the charger.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Henning Kirchberg, Abraham Nitzan
Summary: In this study, we examined the discrete and continuous representations of a thermodynamic process involving a random walker using energy to move downhill. We found that the uniqueness of the continuous limit depended on the assumptions made about unchanged physical observables during the process. Additionally, we investigated the impact of discretization on thermodynamic efficiency and observed an increase in efficiency as the process approached the continuous limit.
Article
Quantum Science & Technology
Sourabh Lahiri, Subhashish Banerjee, A. M. Jayannavar
Summary: Work fluctuation theorems are significant achievements in nonequilibrium Statistical Physics, with recent interest in quantum regimes with generalized measurements. Studies show that in the framework of generalized measurements, the original form of the Jarzynski equality is not exact, but deviations are small and can deduce an approximate effective temperature of the thermal bath. In the limit of projective measurements, the exact form of work fluctuation theorems is recovered.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Quantum Science & Technology
Sanuja D. Mohanty, Gautam Sharma, Sk Sazim, Biswajit Pradhan, Arun K. Pati
Summary: Quantum measurement can both destroy and create coherence. In this study, we determine the maximum amount of coherence that can be created under a complete non-selective measurement process. We categorize measurement processes into two types based on their ability to induce coherence. Our findings indicate that the presence of more POVM elements in a measurement reduces its coherence creating ability. We introduce the concept of raw coherence in POVMs to aid in the creation of quantum coherence. Additionally, we identify a trade-off relationship between coherence creation, generation of entanglement, and system mixedness in a general measurement setup.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Physics, Mathematical
Giacomo De Palma, Andrea Mari, Vittorio Giovannetti, Alexander S. Holevo
JOURNAL OF MATHEMATICAL PHYSICS
(2015)
Article
Physics, Mathematical
L. Lami, V. Giovannetti
JOURNAL OF MATHEMATICAL PHYSICS
(2015)
Article
Optics
A. Mari, A. Farace, V. Giovannetti
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2015)
Article
Optics
Matteo Ippoliti, Leonardo Mazza, Matteo Rizzi, Vittorio Giovannetti
Article
Optics
Antonella De Pasquale, Paolo Facchi, Giuseppe Florio, Vittorio Giovannetti, Koji Matsuoka, Kazuya Yuasa
Article
Optics
V. Ameri, M. Eghbali-Arani, A. Mari, A. Farace, F. Kheirandish, V. Giovannetti, R. Fazio
Article
Optics
G. De Palma, A. Mari, S. Lloyd, V. Giovannetti
Article
Optics
Salvatore Lorenzo, Alessandro Farace, Francesco Ciccarello, G. Massimo Palma, Vittorio Giovannetti
Article
Optics
L. Rigovacca, A. Farace, A. De Pasquale, V. Giovannetti
Article
Materials Science, Multidisciplinary
Stefano Valentini, Rosario Fazio, Vittorio Giovannetti, Fabio Taddei
Article
Materials Science, Multidisciplinary
Biswajit Karmakar, Davide Venturelli, Luca Chirolli, Vittorio Giovannetti, Rosario Fazio, Stefano Roddaro, Loren N. Pfeiffer, Ken W. West, Fabio Taddei, Vittorio Pellegrini
Article
Physics, Multidisciplinary
V. Giovannetti, A. S. Holevo, A. Mari
THEORETICAL AND MATHEMATICAL PHYSICS
(2015)
Article
Physics, Mathematical
V. Giovannetti, A. S. Holevo, R. Garcia-Patron
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2015)
Article
Computer Science, Artificial Intelligence
Daniel Burgarth, Vittorio Giovannetti, Leslie Hogben, Simone Severini, Michael Young
Proceedings Paper
Physics, Multidisciplinary
E. Moreva, G. Brida, M. Gramegna, V. Giovannetti, L. Maccone, M. Genovese
7TH INTERNATIONAL WORKSHOP DICE2014 SPACETIME - MATTER - QUANTUM MECHANICS
(2015)