We propose a many-body quantum engine powered by the energy difference between entangled ground state of interacting system and local separable states. Performing measurements on an can produce excited states from which work be extracted via feedback operations. These reveal vacuum fluctuations global in basis provide required to run engine. The reset part cycle is particularly simple: coupled cold bath allowed relax its state. illustrate our proposal two types systems: A chain qubits...

We propose a quantum absorption refrigerator using the physics of resonant tunneling through dots. The cold and hot reservoirs are fermionic leads, tunnel coupled via dots to central cavity, we configurations in which heat absorbed from (very hot) cavity is used as resource selectively transfer reservoir on left right. Heat transport device particle-hole symmetric; find two regimes cooling function dot energies---symmetric with respect Fermi energy reservoirs---and associate them by...

We propose cyclic refrigeration in solid state, employing a gas of magnetic field vortices type-II superconductor---also known as fluxons---as the cooling agent. Refrigeration cycles are realized by envisioning racetrack geometry consisting both adiabatic and isothermal arms, etched into superconductor. The guided propagation fluxons is achieved applying an external electrical current, Corbino geometry, through sample. A gradient set across allowing one to adiabatically cool down heat up...

We study a quantum dot coupled to two semiconducting reservoirs, when the level and electrochemical potential are both close band edge in reservoirs. This is modeled with an exactly solvable Hamiltonian without interactions (the Fano-Anderson model). The model known show abrupt transition as dot-reservoir coupling increased into strong-coupling regime for broad class of structures. involves infinite-lifetime bound state appearing gap. find signature this continuum states model, visible...

We use exact techniques to demonstrate theoretically the pumping of fractional charges in a single-level noninteracting quantum dot, when dot-reservoir coupling is adiabatically driven from weak strong coupling. The pumped charge averaged over many cycles quantized at fraction an electron per cycle, determined by ratio Lamb shift level broadening; this imposed reservoir band structure. For uniform density states, half cycle. call adiabatic almost-topological pumping, because pumping's Berry...

We study transport through a single-level system placed between two reservoirs with band-structure, taking strong level-reservoir coupling of the order energy-scales these band-structures. An exact solution in absence interactions gives nonlinear Lamb shift. As expected, this moves perfectly-transmitting state (the reservoir that flows without reflection), and can even turn it into bound-state. However, here we show also create additional pairs states at other energies, when exceeds critical...

We investigate the influence of a weakly nonlinear Josephson bath consisting chain junctions on dynamics small quantum system (LC oscillator). Focusing regime where charging energy is largest scale, we perturbatively calculate correlation function to leading order in divided by while keeping cosine potential exactly. When variation along ensures fast decay function, LC oscillator that and capacitively coupled can be solved through Markovian master equation. establish duality relation for...

We study a chain of alternating hot and cold electronic nanocavities---connected to one another via resonant-tunneling quantum dots---with the intent achieving precise thermal control across chain. This is accomplished by positioning dots' energy levels such that predetermined distribution heat currents realized in steady state. The number electrons each cavity conserved state which constrains cavities' chemical potentials. determine these potentials analytically linear response regime where...

We propose a many-body quantum engine powered by the energy difference between entangled ground state of interacting system and local separable states. Performing measurements on an can produce excited states from which work be extracted via feedback operations. These reveal vacuum fluctuations global in basis provide required to run engine. The reset part cycle is particularly simple: coupled cold bath allowed relax its state. illustrate our proposal two types systems: chain qubits harmonic...

We propose cyclic quantum refrigeration in solid-state, employing a gas of magnetic field vortices type-II superconductor -- also known as fluxons the cooling agent. Refrigeration cycles are realized by envisioning racetrack geometry consisting both adiabatic and isothermal arms, etched into superconductor. The guided propagation is achieved applying an external electrical current, Corbino geometry, through sample. A gradient set across allowing one to adiabatically cool down heat up...