Now showing items 1-6 of 6

    • Disorder-assisted graph coloring on quantum annealers 

      Więckowski, Andrzej; Deffner, Sebastian; Gardas, Bartłomiej (APS, 2019-03-17)
      We are at the verge of a new era, which will be dominated by Noisy Intermediate-Scale Quantum Devices. Prototypical examples for these new technologies are present-day quantum annealers. In the present work, we investigate ...
    • Non-hermitian quantum thermodynamics 

      Gardas, Bartłomiej; Deffner, Sebastian; Saxena, Avadh (Springer Nature, 2016-03-22)
      Thermodynamics is the phenomenological theory of heat and work. Here we analyze to what extent quantum thermodynamic relations are immune to the underlying mathematical formulation of quantum mechanics. As a main result, ...
    • 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 ...
    • 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 ...
    • 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 ...
    • Thermodynamic universality of quantum Carnot engines 

      Gardas, Bartłomiej; Deffner, Sebastian (American Physical Society (APS), 2015-10-12)
      The Carnot statement of the second law of thermodynamics poses an upper limit on the efficiency of all heat engines. Recently, it has been studied whether generic quantum features such as coherence and quantum entanglement ...