AAPPS bulletin

December 2023Vol 33

Research and Review
  • Simulating Gaussian boson sampling quantum computers

    Alexander S. Dellios, Margaret D. Reid & Peter D. Drummond

    Abstract A growing cohort of experimental linear photonic networks implementing Gaussian boson sampling (GBS) have now claimed quantum advantage. However, many open questions remain on how to effectively verify these experimental results, as scalable methods are needed that fully capture the rich array of quantum correlations generated by these photonic quantum computers. In this paper, we briefly review recent theoretical methods to simulate experimental GBS networks. We focus mostly on method

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  • Atomic construction and spectroscopic characterization of FeSe-derived thin films on SrTiO3 substrates

    Yao Zhang, Zhi-Mo Zhang, Jin-Hua Nie, Wenhao Zhang & Ying-Shuang Fu

    Abstract Controllably fabricating low-dimensional systems and unraveling their exotic states at the atomic scale is a pivotal step for the construction of quantum functional materials with emergent states. Here, by utilizing the elaborated molecular beam epitaxy growth, we obtain various FexSey phases beyond the single-layer FeSe/SrTiO3 films. A synthetic strategy of lowering substrate temperature with superfluous Se annealing is implemented to achieve various stoichiometric FeSe-derived phases

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  • A brief history of free parafermions

    Murray T. Batchelor, Robert A. Henry & Xilin Lu

    Abstract In this article we outline the historical development and key results obtained to date for free parafermionic spin chains. The concept of free parafermions provides a natural N-state generalization of free fermions, which have long underpinned the exact solution and application of widely studied quantum spin chains and their classical counterparts. In particular, we discuss the Baxter-Fendley free parafermionic Z(N) spin chain, which is a relatively simple non-Hermitian generalization

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  • Advanced operation modes relying on core plasma turbulence stabilization in tokamak fusion devices

    Yong-Su Na

    Abstract Recent progress of advanced operation modes in tokamaks is addressed focusing upon internal transport barrier (ITB) discharges. These ITB discharges are being considered as one of candidate operation modes in fusion reactors. Here, “internal” means core region of a fusion plasma, and “transport barrier” implies bifurcation of transport phenomena due to suppressing plasma turbulence. Although ITB discharges have been developed since the mid-1990, they have been suffering from harmful pl

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  • Thermally stable p-wave repulsive Fermi polaron without a two-body bound state

    Hui Hu, Jia Wang & Xia-Ji Liu

    Abstract We theoretically investigate the polaron physics of an impurity immersed in a two-dimensional Fermi sea, interacting via a p-wave interaction at finite temperature. In the unitary limit with a divergent scattering area, we find a well-defined repulsive Fermi polaron at short interaction range, which shows a remarkable thermal stability with increasing temperature. The appearance of such a stable repulsive Fermi polaron in the resonantly interacting limit can be attributed to the existe

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  • Pion and photon beam initiated backward charmonium or lepton pair production

    Bernard Pire, Kirill M. Semenov-Tian-Shansky, Alisa A. Shaikhutdinova & Lech Szymanowski

    Abstract Hard exclusive reactions initiated by pion or photon beams within the near-backward kinematical regime specified by the small Mandelstam variable \(-u\) can be studied to access pion-to-nucleon and photon-to-nucleon transition distribution amplitudes (TDAs). Checking the validity of collinear factorized description of pion and photon induced reactions in terms of TDAs allows to test the universality of TDAs between the space-like and time-like regimes that is the indispensable feature

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News and Views
  • A Build-up Towards Establishing Malaysia’s Quantum Science and Technology Initiative

    MyQI and Institut Fizik Malaysia (IFM)

    5 A Build-up Towards Establishing Malaysia’s Quantum Science and Technology Initiative by MyQI and Institut Fizik Malaysia (IFM) Quantum technology makes use of quantum effects such as superposition, interference, or entanglement to outperform conventional computing and information processing carried out using classical bits. Quantum technology has received considerable attention from scientists, engineers, and governments all over the world as it promises, among other things, more powerful com

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  • Catching the Electron’s Motion: The Nobel Prize in Physics 2023 for Attosecond Light

    Zhi-Yi Wei

    4 Catching the Electron’s Motion: The Nobel Prize in Physics 2023 for Attosecond Light by Zhi-Yi Wei On 3rd Oct, 2023, the Nobel Prize in Physics was awarded to Pierre Agostini, Ferenc Krausz, and Anne L’Huillier for experimental methods that generate attosecond pulses of light for the study of electron dynamics in matter. It is the fourth Nobel Prize for ultrafast science and technology since Prof. A.H. Zewail became a Nobel laureate for his work on femtosecond chemistry in 1999. An attosecond

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  • Report on the 54th AAPPS Video Council Meeting

    AAPPS

    3 Report on the 54th AAPPS Video Council Meeting by AAPPS (0) President Hyoung Joon Choi reported the presence of 14 council members out of 16 council members. The quorum was met. (1) President Choi opened the 54th Council Meeting and welcomed the participants. The participants, including chairs of divisions and the working group, introduced themselves. The agenda was adopted as prepared by the president. (2) Treasurer Keun-Young Kim briefly reported on the financial status of AAPPS. The total

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  • Evidence for Ultra-long Wavelengths Gravitational Waves

    Bhal Chandra Joshi, Yashwant Gupta

    2 Evidence for Ultra-long Wavelengths Gravitational Waves by Bhal Chandra Joshi and Yashwant Gupta A new window in the gravitational wave (GW) spectrum was opened recently at nano-Hertz frequencies with the recent announcement of evidence for such waves from stochastic gravitational wave background (SGWB) by the European Pulsar Timing Array (EPTA) and the Indo-Japanese Pulsar Timing Array (InPTA) collaboration coordinated with a similar announcement by the North American NanOhertz GRAVitational

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  • Collective Neutrino Oscillations

    Basudeb Dasgupta

    1 Collective Neutrino Oscillations by Basudeb Dasgupta Neutrino oscillation, the quantum transmutation of one type of neutrino to another, takes on a puzzling new form when the density of neutrinos is very large. This new kind of neutrino oscillation, called collective neutrino oscillation, has presented an interesting challenge for theoretical physicists. Although many aspects remain to be fully understood, its anticipated impact on the explosion of stars and the creation of elements therein p

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