Reservoir engineering with arbitrary temperatures for spin systems and quantum thermal machine with maximum efficiency

Abstract

Abstract Reservoir engineering is an important tool for quantum information science and quantum thermodynamics since it allows for preparing and/or protecting special quantum states of single or multipartite systems or to investigate fundamental questions of the thermodynamics as quantum thermal machines and their efficiencies. Here we employ this technique to engineer reservoirs with arbitrary (effective) negative and positive temperatures for a single spin system. To this end, we firstly engineer an appropriate interaction between a qubit system, a carbon nuclear spin, to a fermionic reservoir, in our case a large number of hydrogen nuclear spins that acts as the spins bath. This carbon-hydrogen structure is present in a polycrystalline adamantane, which was used in our experimental setup. The required interaction engineering is achieved by applying a specific sequence of radio-frequency pulses using Nuclear Magnetic Resonance (NMR), while the temperature of the bath can be controlled by appropriate preparation of the initial hydrogen nuclear spin state, being the predicted results in very good agreement with the experimental data. As an application we implemented a single qubit quantum thermal machine which operates at a single reservoir at effective negative temperature whose efficiency is always 100%, independent of the unitary transformation performed on the qubit system, as long as it changes the qubit state.

arXiv comment7 pages, 6 figures

References in corpus (20)

• Entanglement of Formation of an Arbitrary State of Two Qubits
• Prescription for experimental determination of the dynamics of a quantum black box
• Quantum Thermodynamic Cycles and quantum heat engines
• Experimental characterization of a spin quantum heat engine
• Dynamical decoupling noise spectroscopy
• Robust dynamical decoupling for quantum computing and quantum memory
• Negative Absolute Temperature for Motional Degrees of Freedom
• Squeezed thermal reservoirs as a resource for a nano-mechanical engine beyond the Carnot limit
• Coherence effects in the performance of the quantum Otto heat engine
• Generation of EPR-entangled radiation through an atomic reservoir
• Suppression of the radiative decay of atomic coherence in squeezed vacuum
• Efficiency of a quantum Otto heat engine operating under a reservoir at effective negative temperatures
• Optimal pulse spacing for dynamical decoupling in the presence of a purely-dephasing spin-bath
• Performance comparison of dynamical decoupling sequences for a qubit in a rapidly fluctuating spin-bath
• Thermodynamics of discrete quantum processes
• An alternative quantum fidelity for mixed states of qudits
• Nonadiabatic coherent evolution of two-level systems under spontaneous decay
• Relaxation to Negative Temperatures in Double Domain Systems
• Generation of decoherence-free displaced squeezed states of radiation fields and a squeezed reservoir for atoms in cavity QED
• Theoretical method for the generation of a dark two-mode squeezed state of a trapped ion

Cited by in corpus (13)

• Quantum thermodynamic devices: from theoretical proposals to experimental reality
• Quantum Engines and Refrigerators
• Roadmap on Quantum Thermodynamics
• Dissipative stabilization of dark quantum dimers via squeezed vacuum
• Reservoir-assisted quantum battery charging at finite temperatures
• Optimizations of Multilevel Quantum Heat Engine with N Noninteracting Fermions Based on Lenoir Cycle
• Cooling with fermionic reservoir
• Negative temperature is cool for cooling
• Advancing Quantum Otto Engine Performance via Additional Magnetic Field and Effective Negative Temperature
• Availing non-Markovian dynamics in effective negative temperature-based transient quantum Otto engines
• System-environment quantum information flow
• On the energetic analysis of autonomous quantum systems
• Quantum Otto Thermal Machines Powered by Kerr Nonlinearity