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Decoherence of a spin-valley qubit in a MoS2 quantum dot MoS2量子点中自旋谷量子位的退相干
IF 1.2
Journal of Physics Communications Pub Date : 2022-11-14 DOI: 10.1088/2399-6528/aca270
M. Arfaoui, S. Jaziri
{"title":"Decoherence of a spin-valley qubit in a MoS2 quantum dot","authors":"M. Arfaoui, S. Jaziri","doi":"10.1088/2399-6528/aca270","DOIUrl":"https://doi.org/10.1088/2399-6528/aca270","url":null,"abstract":"Transition metal dichalcogenide (TMD)-based quantum dots (QDs) have proven to be a successful and promising device for physically implementing electron spin-valley based qubits. Although the electron spin in a TMDs monolayer semiconductor QD can be isolated and controlled with high precision, decoherence occurs due to unavoidable coupling with the surrounding environment, such as nuclear spin environments. In this paper, using an exact master equation (ME) of spin qubit dynamics coupled to a nuclear spin bath in terms of hyperfine interaction (HI), we have investigated the controllability of dynamics processes with varying degrees of non-Markovianity. In large magnetic fields, we show that pure spin or valley qubits can be created. We calculate the loss of fidelity due to the Overhauser field of HI in a wide range of nuclear spin N . In this context, we prove that this field restricts the decoherence process of the central electron spin, which can regain its coherence. Finally, we discuss how the coherence of the spin qubit remains robust for large N .","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43960942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Conservation, impermeability and potential vorticity in relativistic magnetohydrodynamics 相对论磁流体力学中的守恒、不渗透性和位涡
IF 1.2
Journal of Physics Communications Pub Date : 2022-11-10 DOI: 10.1088/2399-6528/aca1f4
S. Fletcher
{"title":"Conservation, impermeability and potential vorticity in relativistic magnetohydrodynamics","authors":"S. Fletcher","doi":"10.1088/2399-6528/aca1f4","DOIUrl":"https://doi.org/10.1088/2399-6528/aca1f4","url":null,"abstract":"The conservation and impermeability conditions are reformulated utilising differential forms and generalised to spacetime. The thermodynamic and electromagnetic potential vorticity scalar fields are defined for relativistic magnetohydrodynamics and their evolution equations are derived.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":"6 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41262785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Geometry of phase-covariant qubit channels 相位协变量子比特通道的几何结构
IF 1.2
Journal of Physics Communications Pub Date : 2022-10-31 DOI: 10.1088/2399-6528/ace0f4
Katarzyna Siudzi'nska
{"title":"Geometry of phase-covariant qubit channels","authors":"Katarzyna Siudzi'nska","doi":"10.1088/2399-6528/ace0f4","DOIUrl":"https://doi.org/10.1088/2399-6528/ace0f4","url":null,"abstract":"We analyze the geometry on the space of non-unital phase-covariant qubit maps. Using the corresponding Choi-Jamiołkowski states, we derive the Hilbert-Schmidt line and volume elements using the channel eigenvalues together with the parameter that characterizes non-unitality. We find the shapes and analytically compute the volumes of phase-covariant channels, in particular entanglement breaking and obtainable with time-local generators.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48971682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mass spectroscopy of excited light mesons using truncated overlap fermions 利用截断重叠费米子的受激光介子的质谱
IF 1.2
Journal of Physics Communications Pub Date : 2022-10-31 DOI: 10.1088/2399-6528/ac9f00
Yuko Murakami, M. Sekiguchi, H. Wada, M. Wakayama
{"title":"Mass spectroscopy of excited light mesons using truncated overlap fermions","authors":"Yuko Murakami, M. Sekiguchi, H. Wada, M. Wakayama","doi":"10.1088/2399-6528/ac9f00","DOIUrl":"https://doi.org/10.1088/2399-6528/ac9f00","url":null,"abstract":"We study excited light mesons by quenched lattice quantum chromodynamics (QCD) simulations with a truncated overlap fermion formalism based on domain wall fermions. Truncated overlap fermions satisfy lattice chiral symmetry instead of chiral symmetry in continuum field theory, as for domain wall fermions, but offer lower simulation costs. Our results show good agreement with the experimental values for the excited state of a 1, ρ, and π mesons, and demonstrate that a 1(1260) and a 1(1640) are simple two-quark states, whereas a 1(1420) may have a more complicated structure. The results are similar to those of previous dynamical studies using clover-Wilson fermions or chirally improved fermions, even though our lattice QCD calculations are performed with the quenched approximation. The study shows that lattice QCD simulations using truncated overlap fermions are essential in lattice studies of excited states.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41465996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Single photon detection performance of highly disordered NbTiN thin films 高无序NbTiN薄膜的单光子探测性能
IF 1.2
Journal of Physics Communications Pub Date : 2022-10-27 DOI: 10.1088/2399-6528/acd747
Ruoyan Ma, Ruibin Shu, Xingyu Zhang, A. Yu, Huang Jia, You Xiao, Huiqin Yu, Xiaoyu Liu, Hao Li, P. Eklund, Xiaofu Zhang, L. You
{"title":"Single photon detection performance of highly disordered NbTiN thin films","authors":"Ruoyan Ma, Ruibin Shu, Xingyu Zhang, A. Yu, Huang Jia, You Xiao, Huiqin Yu, Xiaoyu Liu, Hao Li, P. Eklund, Xiaofu Zhang, L. You","doi":"10.1088/2399-6528/acd747","DOIUrl":"https://doi.org/10.1088/2399-6528/acd747","url":null,"abstract":"We experimentally investigated the detection performance of highly disordered NbxTi1−xN based superconducting nanowire single photon detectors (SNSPDs). The dependence on the composition of the transition temperature Tc for NbxTi1−xN films show a dome-like behavior on the Nb content, with a maximal Tc at xNb∼0.65, and the Nb0.65Ti0.35N films also combine relatively large sheet resistance and intermediate residual resistivity ratio. Moreover, 60-nm-wide and 7-nm-thick Nb0.65Ti0.35N nanowires show a switching current as high as 14.5 μA, and saturated intrinsic detection efficiency with a plateau of more than 2 μA at 2.4 K. Finally, the corresponding SNSPDs on an alternative SiO2/Ta2O5 dielectric mirror showed a system detection efficiency of approximately 92% for 1550 nm photons, and the timing jitter is around 26 ps. Our results demonstrate that the highly disordered NbxTi1−xN films are promising for fabricating SNSPDs for near- and middle-infrared single photons with high detection efficiency and low timing jitter.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48287307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Ripple formation with intense Gaussian femtosecond laser pulses close to the damage threshold 强高斯飞秒激光脉冲接近损伤阈值时的纹波形成
IF 1.2
Journal of Physics Communications Pub Date : 2022-10-24 DOI: 10.1088/2399-6528/ac9d25
U. Teubner, A. Andreev, V. Makin, J. Imgrunt
{"title":"Ripple formation with intense Gaussian femtosecond laser pulses close to the damage threshold","authors":"U. Teubner, A. Andreev, V. Makin, J. Imgrunt","doi":"10.1088/2399-6528/ac9d25","DOIUrl":"https://doi.org/10.1088/2399-6528/ac9d25","url":null,"abstract":"The formation of laser-induced periodic surface structures (LIPSS or ripples) is a topic that has been investigated for almost 60 years. More recently with the advent of ultrashort laser pulses this subject has regained interest, in particular, due to interaction regimes that have not been present so far. Consequently a lot of work has been done in that field, especially with comprehensive experimental and theoretical investigations of the scaling of ripple parameters on laser pulse duration, wavelength, applied fluence, shot number and so on. However, there are still a lot of questions. The present work addresses an important issue on that subject. In particular, ripple formation is investigated at high laser intensity, namely at an intensity sufficiently large to generate a femtosecond-laser induced plasma. Thus ripple formation occurs close to damage threshold. Experimental results and theoretical discussion of ripple formation and the interrelation to laser pulse energy deposition, energy transport and sample damage originating from the optical interaction and additional thermal effects, respectively, are discussed. Most important, a reduction of ripple formation threshold with laser intensity and fluence, respectively, has been observed which is associated by a super-linear increase of the ripple area. The scaling of this reduction with laser fluence obtained from theoretical estimates is in good agreement with the experimental data.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47419368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Asymptotic phase-locking and synchronization in two-qubit systems 双量子位系统的渐近锁相与同步
IF 1.2
Journal of Physics Communications Pub Date : 2022-10-13 DOI: 10.1088/2399-6528/acc0d4
Daniel Štěrba, J. Novotny, I. Jex
{"title":"Asymptotic phase-locking and synchronization in two-qubit systems","authors":"Daniel Štěrba, J. Novotny, I. Jex","doi":"10.1088/2399-6528/acc0d4","DOIUrl":"https://doi.org/10.1088/2399-6528/acc0d4","url":null,"abstract":"The paper concerns spontaneous asymptotic phase-locking and synchronization in two-qubit systems undergoing continuous Markovian evolution described by Lindbladian dynamics with normal Lindblad operators. Using analytic methods, all phase-locking-enforcing mechanisms within the given framework are obtained and classified. Detailed structures of their respective attractor spaces are provided and used to explore their properties from various perspectives. Amid phase-locking processes those additionally enforcing identical stationary parts of both qubits are identified, including as a special case the strictest form of synchronization conceivable. A prominent basis is presented which reveals that from a physical point of view two main types of phase-locking mechanisms exist. The ability to preserve information about the initial state is explored and an upper bound on the amplitude of oscillations of the resulting phase-locked dynamics is established. Permutation symmetry of both asymptotic states and phase-locking mechanisms is discussed. Lastly, the possibility of entanglement production playing the role of a phase-locking witness is rebutted by three analytically treatable examples.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":"7 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61174302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Regularity and resilience of short-range order in uniformly randomized lattices 均匀随机格中短程有序的规律性和弹性
IF 1.2
Journal of Physics Communications Pub Date : 2022-10-11 DOI: 10.1088/2399-6528/ac9954
Sebenzile Tsabedze, Nkosikhona Dlamini, S. Mkhonta
{"title":"Regularity and resilience of short-range order in uniformly randomized lattices","authors":"Sebenzile Tsabedze, Nkosikhona Dlamini, S. Mkhonta","doi":"10.1088/2399-6528/ac9954","DOIUrl":"https://doi.org/10.1088/2399-6528/ac9954","url":null,"abstract":"Randomly perturbed lattice models play a vital role in the exploration of novel quasi-disordered structures such as disordered photonic crystals that combine the coherent optical effects of crystals and the broadband, isotropic power spectra of disordered media. Recent studies have shown that the Bragg scattering peaks of uniformly randomized lattices can be switch-on and -off by increasing the perturbation strength while preserving the long-range order of the underlying lattice. In this work, we investigate the pair correlation statistics of uniformly randomized lattices focusing on the impact of the perturbations on the system’s short-range order. We find that locally isotropic perturbations generate disordered structures with resilient hyperuniformity and short-range order. The interplay of these two properties has been discovered to be critical in the design of disordered materials with enhanced photonic band gaps and light absorption. The present study provides an alternative approach for designing partially disordered hyperuniform structures.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42563029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Atmospheric plasma jet for surface treatment of biomaterials 用于生物材料表面处理的大气等离子体射流
IF 1.2
Journal of Physics Communications Pub Date : 2022-10-10 DOI: 10.1088/2399-6528/ac98f3
Mahmood Nasser, Ban AlMandalawi, L. Nasser
{"title":"Atmospheric plasma jet for surface treatment of biomaterials","authors":"Mahmood Nasser, Ban AlMandalawi, L. Nasser","doi":"10.1088/2399-6528/ac98f3","DOIUrl":"https://doi.org/10.1088/2399-6528/ac98f3","url":null,"abstract":"A direct current (DC) powered low-temperature atmospheric pressure plasma (LTAPP) jet device was built and used to sterilize Escherichia coli (E. coli) bacteria. The plasma jet’s general properties, such as length and temperature, were first tested and found to be strongly related to the plasma jet’s operational flow mode (laminar or turbulent flow). The optical emission spectra of various gas mixtures were measured to confirm the presence of active radicals, which is critical for sterilization success. Pure helium gas or a combination of helium with a small percentage of oxygen (6.25%) was found to have the highest intensities of bactericidal species such as atomic oxygen (O) and hydroxide (OH). These mixtures were then used to treat E. coli bacteria previously grown in a Petri dish. Sterilization was accomplished by repeatedly treating the bacteria for 10 s for 5–10 rounds for short periods. The best results were obtained when the bacteria had enough time to rest between rounds.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43682195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Disordered packings of binary mixtures of dimer particles 二聚体颗粒二元混合物的无序填充
IF 1.2
Journal of Physics Communications Pub Date : 2022-10-10 DOI: 10.1088/2399-6528/ac98f2
Esma Kurban, A. Baule
{"title":"Disordered packings of binary mixtures of dimer particles","authors":"Esma Kurban, A. Baule","doi":"10.1088/2399-6528/ac98f2","DOIUrl":"https://doi.org/10.1088/2399-6528/ac98f2","url":null,"abstract":"Disordered packings of non-spherical particles and their mixtures are abundant in nature, but have so far attracted only few systematic studies. Previous investigations of binary mixtures of specific convex shapes have established two generic properties: (i) the existence of a unique density maximum when shape or mixture composition of the two species are varied; (ii) the validity of an ideal mixing law indicating that the packing density is independent of the segregation state. These findings were so far only observed for mixtures of convex particles such as spherocylinders, ellipsoids, and spheres. Here, we investigate the packing properties of binary mixtures of frictionless dimer particles simulated by a gravitational pouring protocol in LAMMPS. Our results demonstrate the validity of (i, ii) also for such packings of non-convex particles. Moreover, we investigate the contact statistics of these packings to elucidate the microstructural features that underlie (i, ii). Our results show that the contact number per species also satisfies a simple mixing law and that similar microscopic rearrangements of contacts as in monodisperse dimer packings accompany the formation of the density peak in binary mixtures largely independent of the mixture composition.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42996316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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