Refrigeration Below 1 Kelvin

Cao, Haishan

doi:10.1007/s10909-021-02606-7

Cited by 12 publications

(3 citation statements)

References 117 publications

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“…Additionally, from both figures 7(a) and (b), this fact can be understood that, whenever n b th < 0.1 holds, magnon and photon statistics do not critically change. So, considering the low temperature (of the order ≃ 0.4 mK which is accessible with the present experimental capabilities [81,82]) and the above-explained facts, the validity of our results can be confirmed.…”

Section: Resultssupporting

confidence: 83%

Steady state quantum statistics of a hybrid optomechanical-ferromagnet system: photon and magnon blockade

Kheirabady¹,

Tavassoly²

2023

J. Phys. B: At. Mol. Opt. Phys.

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Magnon and photon blockade implementation and manipulation have significant practical applications in quantum information processing and quantum metrology due to their tight relations to single-photon and -magnon source devices. In this paper, we propose an experimentally feasible hybrid scheme for the dynamical description of the tripartite interacting system consisting of magnon and phonon modes with photons in an optomechanical system, from which we aim to explore the quantum statistics, as well as the magnon and photon blockade phenomenon. To achieve the purpose, the dissipative solution of the system is obtained with the help of the Lindblad master equation. Via employing the equal-time second-order correlation function and using the steady state solution of the system, the statistics and blockade effects of magnon and photon are analyzed and also their dependence on the parameters involved in the system are discussed. Utilizing feasible parameters, our simulations illustrate that, sub-Poissonian behavior and therefore, blockade of magnon and photon are simultaneously achieved. More importantly, the mentioned blockade effects can be obtained in a range of parameters (and not with specific) which makes our proposal easy to access, experimentally. Considering the above realizations, the introduced scheme opens up a pathway to design single-magnon and - photon generators, which are of crucial importance in advanced quantum science and technologies.

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Section: Resultssupporting

confidence: 83%

Steady state quantum statistics of a hybrid optomechanical-ferromagnet system: photon and magnon blockade

Kheirabady¹,

Tavassoly²

2023

J. Phys. B: At. Mol. Opt. Phys.

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“…At the end of each sweep, the bath spins are measured and reset. ample, with nuclear adiabatic demagnetization, one can reach temperatures in the µK range [27,28] by coupling the system to nuclear moments polarized in a large magnetic field and adiabatically ramping down the field.…”

mentioning

confidence: 99%

Programmable adiabatic demagnetization for systems with trivial and topological excitations

Matthies¹,

Rudner²,

Rosch³

et al. 2022

Preprint

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We propose a simple, robust protocol to prepare a low-energy state of an arbitrary Hamiltonian on a quantum computer or programmable quantum simulator. The protocol is inspired by the adiabatic demagnetization technique, used to cool solid-state systems to extremely low temperatures. A fraction of the qubits (or spins) is used to model a spin bath that is coupled to the system. By an adiabatic ramp down of a simulated Zeeman field acting on the bath spins, energy and entropy are extracted from the system. The bath spins are then measured and reset to the polarized state, and the process is repeated until convergence to a low-energy steady state is achieved. We demonstrate the protocol via application to the quantum Ising model. We study the protocol's performance in the presence of noise and show how the information from the measurement of the bath spins can be used to monitor the cooling process. The performance of the algorithm depends on the nature of the excitations of the system; systems with non-local (topological) excitations are more difficult to cool than those with local excitations. We explore the possible mitigation of this problem by trapping topological excitations.

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“…在极低温度下, 液氦具有很多量子特性, 例如超流动性和极高的热导率. 特别地, 3 He/ 4 He混合液在一定条件下会发生分相, London [1] 根据这一现象提出了分相制冷原理, 1965年Das等根据这一理论制成了 3 He/ 4 He稀释制冷机, 目前的稀释制冷机最低可达到大约2 mK的低温 [2] . 稀释制冷机经历了从间歇式制冷到连续式制冷的发展过程 [3,4] .…”

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