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  • The Anderson impurity model out-of-equilibrium: Assessing the accuracy of simulation techniques with an exact current-occupation relation 
    AGARWALLA, BIJAY KUMAR; Segal, Dvira (AIP Publishing, 2017-07)
    We study the interacting, symmetrically coupled single impurity Anderson model. By employing the nonequilibrium Green’s function formalism, we reach an exact relationship between the steady-state charge current flowing ...
  • Quantum efficiency bound for continuous heat engines coupled to noncanonical reservoirs 
    AGARWALLA, BIJAY KUMAR; Jiang, Jian-Hua; SEGAL, DVIRA (American Physical Society, 2017-09)
    We derive an efficiency bound for continuous quantum heat engines absorbing heat from squeezed thermal reservoirs. Our approach relies on a full-counting statistics description of nonequilibrium transport and it is not ...
  • Qubit absorption refrigerator at strong coupling 
    Mu, Anqi; AGARWALLA, BIJAY KUMAR; Schaller, Gernot; Segal, Dvira (IOP Publishing, 2017-12)
    We demonstrate that a quantum absorption refrigerator (QAR) can be realized from the smallest quantum system, a qubit, by coupling it in a non-additive (strong) manner to three heat baths. This function is un-attainable ...
  • Quantum energy exchange and refrigeration: a full-counting statistics approach 
    Friedman, Hava Meira; AGARWALLA, BIJAY KUMAR; Segal, Dvira (IOP Publishing, 2018-08)
    We formulate a full-counting statistics description to study energy exchange in multi-terminal junctions. Our approach applies to quantum systems that are coupled either additively or non-additively (cooperatively) to ...
  • Assessing the validity of the thermodynamic uncertainty relation in quantum systems 
    AGARWALLA, BIJAY KUMAR; Segal, Dvira (American Physical Society, 2018-10)
    We examine the so-called thermodynamic uncertainty relation (TUR), a cost-precision trade-off relationship in transport systems. Based on the fluctuation symmetry, we derive a condition for invalidating the TUR for general ...
  • Path-integral methodology and simulations of quantum thermal transport: Full counting statistics approach 
    Kilgour, Michae; AGARWALLA, BIJAY KUMAR; Segal, Dvira (AIP Publishing, 2019-02)
    We develop and test a computational framework to study heat exchange in interacting, nonequilibrium open quantum systems. Our iterative full counting statistics path integral (iFCSPI) approach extends a previously ...
  • Experimental emulation of quantum non-Markovian dynamics and coherence protection in the presence of information backflow 
    KHURANA, DEEPAK; AGARWALLA, BIJAY KUMAR; MAHESH, T. S. (American Physical Society, 2019-02)
    We experimentally emulate, in a controlled fashion, the non-Markovian dynamics of a pure dephasing spin-boson model at zero temperature. Specifically, we use a randomized set of external radio-frequency fields to engineer ...
  • Photon statistics of a double quantum dot micromaser: Quantum treatment 
    AGARWALLA, BIJAY KUMAR; Kulkarni, Manas; Segal, Dvira (American Physical Society, 2019-07)
    A semiconductor single-atom micromaser consists of a microwave cavity coupled to a gain medium, a double quantum dot driven out of equilibrium by a bias voltage. The masing threshold of this system was recently probed by ...
  • Thermodynamic uncertainty relation in thermal transport 
    SARYAL, SUSHANT; Friedman, Hava Meira; Segal, Dvira; AGARWALLA, BIJAY KUMAR (American Physical Society, 2019-10)
    We use the fundamental nonequilibrium steady-state fluctuation symmetry and derive a condition on the validity of the thermodynamic uncertainty relation (TUR) in thermal transport problems, classical and quantum alike. We ...
  • Experimental demonstration of the validity of the quantum heat-exchange fluctuation relation in an NMR setup 
    PAL, SOHAM; MAHESH, T. S.; AGARWALLA, BIJAY KUMAR (American Physical Society, 2019-10)
    We experimentally explore the validity of the Jarzynski and Wójcik quantum heat-exchange fluctuation relation by implementing an interferometric technique in liquid-state nuclear magnetic resonance setup and study the ...
  • Quantum entanglement and transport in a non-equilibrium interacting double-dot system: the curious role of degeneracy 
    Dey, Anirban; Bhakuni, Devendra Singh; AGARWALLA, BIJAY KUMAR; Sharma, Auditya (IOP Publishing, 2020-02)
    We study quantum entanglement and its relation to transport in a non-equilibrium interacting double dot system connected to electronic baths. The dynamical properties in the non-interacting regime are studied using an exact ...
  • Experimental study of the thermodynamic uncertainty relation 
    PAL, SOHAM; SARYAL, SUSHANT; Segal, Dvira; MAHESH, T. S.; AGARWALLA, BIJAY KUMAR (American Physical Society, 2020-05)
    A cost-precision trade-off relationship, the so-called thermodynamic uncertainty relation (TUR), has been recently discovered in stochastic thermodynamics. It bounds certain thermodynamic observables in terms of the ...
  • Thermodynamic uncertainty relation in atomic-scale quantum conductors 
    Friedman, Hava Meira; AGARWALLA, BIJAY KUMAR; Shein-Lumbroso, Ofir; Tal, Oren; Segal, Dvira (American Physical Society, 2020-05)
    The thermodynamic uncertainty relation (TUR), a trade-off relation between thermodynamic cost (entropy production) and precision (fluctuations), is expected to hold in nanoscale electronic conductors, when the electron ...
  • On the definitions and simulations of vibrational heat transport in nanojunctions 
    Kalantar, Na'im; AGARWALLA, BIJAY KUMAR; Segal, Dvira (AIP Publishing, 2020-11)
    Thermal transport through nanosystems is central to numerous processes in chemistry, material sciences, and electrical and mechanical engineering, with classical molecular dynamics as the key simulation tool. Here, we focus ...
  • Readout of quasiperiodic systems using qubits 
    Saha, Madhumita; AGARWALLA, BIJAY KUMAR; Venkatesh, B. Prasanna (American Physical Society, 2021-02)
    We develop a theoretical scheme to perform a readout of the properties of a quasiperiodic system by coupling it to one or two qubits. We show that the decoherence dynamics of a single qubit coupled via a pure dephasing ...
  • Thermodynamic uncertainty relation for energy transport in a transient regime: A model study 
    SARYAL, SUSHANT; SADEKAR, ONKAR; AGARWALLA, BIJAY KUMAR (American Physical Society, 2021-03)
    We investigate a transient version of the recently discovered thermodynamic uncertainty relation (TUR) which provides a precision-cost trade-off relation for certain out-of-equilibrium thermodynamic observables in terms ...
  • Harmonic chains and the thermal diode effect 
    Kalantar, Na'im; AGARWALLA, BIJAY KUMAR; Segal, Dvira (American Physical Society, 2021-05)
    Harmonic oscillator chains connecting two harmonic reservoirs at different constant temperatures cannot act as thermal diodes, irrespective of structural asymmetry. However, here we prove that perfectly harmonic junctions ...
  • Bounds on fluctuations for finite-time quantum Otto cycle 
    SARYAL, SUSHANT; AGARWALLA, BIJAY KUMAR (American Physical Society, 2021-06)
    For quantum Otto engine driven quasistatically, we provide exact full statistics of heat and work for a class of working fluids that follow a scale-invariant energy eigenspectra under driving. Equipped with the full ...
  • Universal Bounds on Fluctuations in Continuous Thermal Machines 
    SARYAL, SUSHANT; Gerry, Matthew; Khait, Ilia; Segal, Dvira; AGARWALLA, BIJAY KUMAR (American Physical Society, 2021-11)
    We study bounds on ratios of fluctuations in steady-state time-reversal energy conversion devices. In the linear response regime, we prove that the relative fluctuations (precision) of the output current (power) is always ...
  • Subdiffusive Phases in Open Clean Long-Range Systems 
    Purkayastha, Archak; SAHA, MADHUMITA; AGARWALLA, BIJAY KUMAR (American Physical Society, 2021-12)
    We show that a one-dimensional ordered fermionic lattice system with power-law-decaying hopping, when connected to two baths at its two ends with different chemical potentials at zero temperature, features two phases showing ...

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