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  • Thermodynamic control -- an old paradigm with new applications 

    Deffner, Sebastian; Bonança, Marcus V. S. (2020-06-24)
    Tremendous research efforts have been invested in exploring and designing so-called shortcuts to adiabaticity. These are finite-time processes that produce the same final states that would result from infinitely slow ...
  • Quantum stochastic thermodynamic on harmonic networks 

    Deffner, Sebastian (IOP, 2016-01-04)
    Fluctuation theorems are symmetry relations for the probability to observe an amount of entropy production in a finite-time process. In a recent paper Pigeon et al (2016 New. J. Phys. 18 013009) derived fluctuation theorems ...
  • Controlling the speed and trajectory of evolution with counterdiabatic driving 

    Iram, Shamreen; Dolson, Emily; Chiel, Joshua; Pelesko, Julia; Krishnan, Nikhil; Güngör, Özenç; Kuznets-Speck, Benjamin; Deffner, Sebastian; Ilker, Efe; Scott, Jacob G.; Hinczewski, Michael (Cold Spring Harbor Laboratory (CHS), 2020-06-04)
    The pace and unpredictability of evolution are critically relevant in a variety of modern challenges: combating drug resistance in pathogens and cancer, understanding how species respond to environmental perturbations like ...
  • Quantum speed limits and the maximal rate of quantum learning 

    Acconcia, Thiago V.; Deffner, Sebastian (2017-06-14)
    The Bremermann-Bekenstein bound is a fundamental bound on the maximal rate with which information can be transmitted. However, its derivation relies on rather weak estimates and plausibility arguments, which make the ...
  • Quantum speed limits and the maximal rate of information production 

    Deffner, Sebastian (American Physical Society (APS), 2020-02-14)
    The Bremermann-Bekenstein bound sets a fundamental upper limit on the rate with which information can be processed. However, the original treatment heavily relies on cosmological properties and plausibility arguments. In ...
  • Repeatability of measurements: Non-Hermitian observables and quantum Coriolis force 

    Gardas, Bartłomiej; Deffner, Sebastian; Saxena, Avadh (American Physical Society (APS), 2016-08-26)
    A noncommuting measurement transfers, via the apparatus, information encoded in a system's state to the external “observer.” Classical measurements determine properties of physical objects. In the quantum realm, the very ...
  • Information free energy for nonequilibrium states 

    Deffner, Sebastian; Lutz, Eric (2012-01-18)
    We introduce an information free energy for thermodynamic systems driven by external time-dependent parameters. We show that the latter is a nonequilibrium state function and that it is a natural generalization of the usual ...
  • Quantum work distribution for a driven diatomic molecule 

    Leonard, Alison; Deffner, Sebastian (Elsevier, 2015-01-13)
    We compute the quantum work distribution for a driven Morse oscillator. To this end, we solve the time-dependent dynamics for a scale-invariant process, from which the exact expressions for the transition probabilities are ...
  • Foundations of statistical mechanics from symmetries of entanglement 

    Deffner, Sebastian; Zurek, Wojciech H (IOP, 2016-06-09)
    Envariance—entanglement assisted invariance—is a recently discovered symmetry of composite quantum systems. We show that thermodynamic equilibrium states are fully characterized by their envariance. In particular, the ...
  • Quantum work statistics of charged Dirac particles in time-dependent fields 

    Deffner, Sebastian; Saxena, Avadh (American Physical Society (APS), 2015-09-28)
    The quantum Jarzynski equality is an important theorem of modern quantum thermodynamics. We show that the Jarzynski equality readily generalizes to relativistic quantum mechanics described by the Dirac equation. After ...
  • Quantum fluctuation theorems in the strong damping limit 

    Deffner, S.; Brunner, M.; Lutz, E. (IOP, 2011-04-21)
    We consider a driven quantum particle in the strong friction regime described by the quantum Smoluchowski equation. We derive Crooks and Jarzynski type relations for the reduced quantum system by properly generalizing the ...
  • Fast forward to the classical adiabatic invariant 

    Jarzynski, Christopher; Deffner, Sebastian; Patra, Ayoti; Subaşı, Yiğit (American Physical Society (APS), 2017-03-10)
    We show how the classical action, an adiabatic invariant, can be preserved under nonadiabatic conditions. Specifically, for a time-dependent Hamiltonian H=p²/2m+U(q,t) in one degree of freedom, and for an arbitrary choice ...
  • Efficiency of Harmonic Quantum Otto Engines at Maximal Power 

    Deffner, Sebastian (MDPI, 2018-12-15)
    Recent experimental breakthroughs produced the first nano heat engines that have the potential to harness quantum resources. An instrumental question is how their performance measures up against the efficiency of classical ...
  • PT-symmetric slowing down of decoherence 

    Gardas, Bartłomiej; Deffner, Sebastian; Saxena, Avadh (American Physical Society (APS), 2016-10-27)
    We investigate PT-symmetric quantum systems ultraweakly coupled to an environment. We find that such open systems evolve under PT-symmetric, purely dephasing and unital dynamics. The dynamical map describing the evolution ...
  • Kibble-Zurek scaling of the irreversible entropy production 

    Deffner, Sebastian (American Physical Society (APS), 2017-11-16)
    If a system is driven at finite rate through a phase transition by varying an intensive parameter, the order parameter shatters into finite domains. The Kibble-Zurek mechanism predicts the typical size of these domains, ...
  • Quantum fluctuation theorem for error diagnostics in quantum annealers 

    Gardas, Bartłomiej; Deffner, Sebastian (Springer Nature, 2018-11-21)
    Near term quantum hardware promises unprecedented computational advantage. Crucial in its development is the characterization and minimization of computational errors. We propose the use of the quantum fluctuation theorem ...
  • Jarzynski Equality for Driven Quantum Field Theories 

    Bartolotta, Anthony; Deffner, Sebastian (American Physical Society (APS), 2018-02-27)
    The fluctuation theorems, and in particular, the Jarzynski equality, are the most important pillars of modern nonequilibrium statistical mechanics. We extend the quantum Jarzynski equality together with the two-time ...
  • Interference of identical particles and the quantum work distribution 

    Gong, Zongping; Deffner, Sebastian; Quan, H. T. (American Physical Society (APS), 2014-12-15)
    Quantum-mechanical particles in a confining potential interfere with each other while undergoing thermodynamic processes far from thermal equilibrium. By evaluating the corresponding transition probabilities between ...
  • Shortcuts to adiabaticity: suppression of pair production in driven Dirac dynamics 

    Deffner, Sebastian (IOP, 2015-12-21)
    Achieving effectively adiabatic dynamics in finite time is a ubiquitous goal in virtually all areas of modern physics. So-called shortcuts to adiabaticity refer to a set of methods and techniques that allow us to produce ...
  • Precision thermometry and the quantum speed limit 

    Campbell, Steve; Genoni, Marco G; Deffner, Sebastian (IOP, 2018-02-05)
    We assess precision thermometry for an arbitrary single quantum system. For a d-dimensional harmonic system we show that the gap sets a single temperature that can be optimally estimated. Furthermore, we establish a simple ...

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