Quantum thermodynamics and quantum coherence engines

Tuncer, Aslı; Müstecaplıoğlu, Özgür E.

doi:10.3906/fiz-2009-12

Cited by 16 publications

(12 citation statements)

References 198 publications

(252 reference statements)

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“…Temperatures for the cavity field are most useful for cooling when they are comparable or hotter than the solar temperatures ∼ 5000 K. Intriguingly, the mechanical components would not equilibrate with such a high temperature, which would melt them, but thermalize to a much colder temperature. An appealing possibility to get high temperatures for the cavity field could be to use micromaser scheme of heating [53], where the pump atoms can be prepared in quantum coherent superpositions [54,55]. Instead of a beam of atoms, one can also consider using a single atom making repeated interactions with the cavity field.…”

Section: Discussionmentioning

confidence: 99%

Ground-state cooling of mechanical resonators by hot thermal light

Naseem¹,

Müstecaplıoğlu²

2020

Preprint

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We propose a scheme to cool down a mechanical resonator to its quantum ground-state, which is interacting with a cavity mode via the optomechanical coupling. As opposed to standard laser cooling schemes where coherence renders the state of the resonator to its ground-state, here we use incoherent thermal light to achieve the same aim. We show that simultaneous cooling of two degenerate or near-degenerate mechanical resonators is possible in our scheme, which is otherwise a challenging goal to achieve in optomechanics. The generalization of this method to the simultaneous cooling of multiple resonators is straightforward. The underlying physical mechanism of cooling is explained by revealing a direct connection between the laser sideband cooling and “cooling by heating” in a standard optomechanical setting.

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Section: Discussionmentioning

confidence: 99%

Ground-state cooling of mechanical resonators by hot thermal light

Naseem¹,

Müstecaplıoğlu²

2020

Preprint

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“…Substituting the coherence parameter from Eq. ( 49) into the Bα i (t) , the effective drive term (62) in the Schrödinger picture becomes…”

Section: Master Equation For Nv Centers In a Common Bath Of Displaced...mentioning

confidence: 99%

“…( 79) we have C 1 = 2|ρ 23 (t)|, approaching to 0.5 in the steady state. Accessibility and generation of only ρ 23 and not the other coherences by thermal means is not surprising from the point of view of the classification of coherences with respect to their thermodynamic heat and work equivalents [61][62][63][64][65]. Coherence ρ 23 belong to the class of socalled heat-exchange coherences [61,62].…”

Section: Nv Center Qubits In a Public Magnon Bathmentioning

confidence: 99%

“…We find that significant coherence is generated robustly along with the entanglement, even in parameter regimes where entanglement is weak or does not exist. The generated coherences in the qubit pair are versatile, significant beyond typical quantum information applications, such as quantum information and heat engines [61][62][63][64][65]. Our scheme can be relatively easier to implement in comparison to schemes requiring precise timing of external pulses as it does not require timedependent drives; besides in comparison to typical bath induced entanglement generation using private baths, common bath is not subject to the problem of focusing thermal noise onto qubits locally.…”

Section: Introductionmentioning

confidence: 99%

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Steady state entanglement of distant nitrogen-vacancy centers in a coherent thermal magnon bath

Ullah¹,

Köse²,

Onbaşlı³

et al. 2021

Preprint

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We investigate steady-state entanglement (SSE) between two nitrogen-vacancy (NV) centers in distant nanodiamonds on an ultrathin Yttrium Iron Garnet (YIG) strip. We determine the dephasing and dissipative interactions of the qubits with the quanta of spin waves (magnon bath) in the YIG depending on the qubit positions on the strip. We show that the magnon's dephasing effect can be eliminated, and we can transform the bath into a multimode displaced thermal state using external magnetic fields. Entanglement dynamics of the qubits in such a displaced thermal bath has been analyzed by deriving and solving the master equation. An additional electric field is considered to engineer the magnon dispersion relation at the band edge to control the Markovian character of the open system dynamics. We determine the optimum geometrical parameters of the system of distant qubits and the YIG strip to get SSE. Furthermore, parameter regimes for which the shared displaced magnon bath can sustain significant SSE against the local dephasing and decoherence of NV centers to their nuclear spin environments have been determined. Along with SSE, we investigate the steady-state coherence (SSC) and explain the physical mechanism of how delayed SSE appears following a rapid generation and sudden death of entanglement using the interplay of decoherence-free subspace states, system geometry, displacement of the thermal bath, and enhancement of the qubit dissipation near the magnon band edge. A non-monotonic relation between bath coherence and SSE is found, and critical coherence for maximum SSE is determined. Our results illuminate the efficient use of system geometry, band edge in bath spectrum, and reservoir coherence to engineer system-reservoir interactions for robust SSE and SSC.

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“…Recent years have witnessed an ever increasing interest and a rapid development in the quest to understand the thermodynamics of out-of-equilibrium quantum systems [1][2][3]. This field of research, widely known as the quantum thermodynamics, blends various branches of physics such as quantum information science, quantum optics, condensed matter physics and quantum control, to name a few.…”

Section: Introductionmentioning

confidence: 99%

Finite-time two-spin quantum Otto engines: Shortcuts to adiabaticity vs. irreversibility

Çakmak¹

2021

Turk J Phys

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We propose a quantum Otto cycle in a two spin-1/2 anisotropic XY model in a transverse external magnetic field. We first characterize the parameter regime that the working medium operates as an engine in the adiabatic regime. Then, we consider finite-time behavior of the engine with and without utilizing a shortcut to adiabaticity (STA) technique. STA schemes guarantee that the dynamics of a system follows the adiabatic path, at the expense of introducing an external control. We compare the performance of the nonadiabatic and STA engines for a fixed adiabatic efficiency but different parameters of the working medium. We observe that, for certain parameter regimes, the irreversibility, as measured by the efficiency lags, due to finite-time driving is so low that nonadiabatic engine performs quite close to the adiabatic engine, leaving the STA engine only marginally better than the nonadiabatic one. This suggests that by designing the working medium Hamiltonian one may spare the difficulty of dealing with an external control protocol.

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Quantum thermodynamics and quantum coherence engines

Cited by 16 publications

References 198 publications

Ground-state cooling of mechanical resonators by hot thermal light

Ground-state cooling of mechanical resonators by hot thermal light

Steady state entanglement of distant nitrogen-vacancy centers in a coherent thermal magnon bath

Finite-time two-spin quantum Otto engines: Shortcuts to adiabaticity vs. irreversibility

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