Identification of a Kitaev quantum spin liquid by magnetic field angle dependence

Quantum spin liquids realize massive entanglement and fractional quasiparticles from localized spins, proposed as an avenue for quantum science and technology. In particular, topological quantum computations are suggested in the non-abelian phase of Kitaev quantum spin liquid with Majorana fermions, and detection of Majorana fermions is one of the most outstanding problems in modern condensed matter physics. Here, we propose a concrete way to identify the non-abelian Kitaev quantum spin liquid by magnetic field angle dependence. Topologically protected critical lines exist on a plane of magnetic field angles, and their shapes are determined by microscopic spin interactions. A chirality operator plays a key role in demonstrating microscopic dependences of the critical lines. We also show that the chirality operator can be used to evaluate topological properties of the non-abelian Kitaev quantum spin liquid without relying on Majorana fermion descriptions. Experimental criteria for the non-abelian spin liquid state are provided for future experiments.

Semiconductor Nanowire Field-Effect Transistors as Sensitive Detectors in the Far-Infrared

Engineering detection dynamics in nanoscale receivers that operate in the far infrared (frequencies in the range 0.1–10 THz) is a challenging task that, however, can open intriguing perspectives for targeted applications in quantum science, biomedicine, space science, tomography, security, process and quality control. Here, we exploited InAs nanowires (NWs) to engineer antenna-coupled THz photodetectors that operated as efficient bolometers or photo thermoelectric receivers at room temperature. We controlled the core detection mechanism by design, through the different architectures of an on-chip resonant antenna, or dynamically, by varying the NW carrier density through electrostatic gating. Noise equivalent powers as low as 670 pWHz−1/2 with 1 µs response time at 2.8 THz were reached.

Prospective Theorizing: Researching for Social Impact

Prospection—defined here as the mental representation and evaluation of possible futures—offers scholars a powerful new approach to researching with social impact. In this paper, we begin by reviewing the strengths and limitations of the kind of theory building long favored by the Academy. We do so to understand why management scholarship is perceived as falling short in terms of its relevance and social impact. We invite management scholars to re-examine what determines a theory’s assessed value in the face of social and global challenges distinguished by emergent complexity (Funtowicz & Ravetz 1994; Scharmer & Käufer, 2010). The advantages of prospective theorizing are presented in two variants: projective and envisioned. The first embraces prospection within the current bounds and editorial practices of the Academy. When viewed through a quantum lens, the second proposes a radically new approach to theory building. It contends that quantum science is giving powerful impetus and renewed legitimacy to the idea that prospective theorizing calls forth a reality rather than objectively studying a world “out there”. Such theorizing is not only about advancing knowledge about what exists. In a very real sense, it has agency to create the future it studies. We conclude with an inquiry into what it means for management research aimed at tackling wicked problems such as climate change and social justice.

Temporal distinguishability in Hong-Ou-Mandel interference for harnessing high-dimensional frequency entanglement

High-dimensional quantum entanglement is currently one of the most prolific fields in quantum information processing due to its high information capacity and error resilience. A versatile method for harnessing high-dimensional entanglement has long been hailed as an absolute necessity in the exploration of quantum science and technologies. Here we exploit Hong-Ou-Mandel interference to manipulate discrete frequency entanglement in arbitrary-dimensional Hilbert space. The generation and characterization of two-, four- and six-dimensional frequency entangled qudits are theoretically and experimentally investigated, allowing for the estimation of entanglement dimensionality in the whole state space. Additionally, our strategy can be generalized to engineer higher-dimensional entanglement in other photonic degrees of freedom. Our results may provide a more comprehensive understanding of frequency shaping and interference phenomena, and pave the way to more complex high-dimensional quantum information processing protocols.

International quantum year proposed for 2025

Physicists around the world are drawing up plans for a year-long celebration of quantum science and technology in 2025.

The Science of Life and Wellbeing: Integrating the New Science of Consciousness with the Ancient Science of Consciousness

Humanity is in the midst of a major shift. To tackle the many challenges that face us, we will need a collective shift in consciousness — a shift from a worldview of separateness to a worldview of interconnectedness. This essay explores the interweaving of quantum science and ancient Chinese culture and examines how these two paradigms provide us a sense of how we are collectively evolving to higher levels of consciousness. A vision of this new era is described in detail, including how culture, models, values, economic structures, the systems of environmental restoration, education, healthcare, and food production will all change, creating a new way of living. The leaders who can help manifest this vision are called Quantum Leaders, and they must first experience their own shift in consciousness in order to lead this societal transformation.

Finite Element Analysis in Nanotechnology Research

The Finite Element Analysis in the field of Nanotechnology is continually contributing to the areas ranging from electronics, micro computing, material science, quantum science, engineering, biotechnology, medicine, aerospace, and environment and in computational nanotechnology. The finite element method (FEM) is widely used for solving problems of traditional fields of engineering and Nano research where experimental analysis is unaffordable. This numerical technique can provide accurate solution to complex engineering problems. Over decades this method has become the noted research area for the mathematicians. The popularity of FEM is due to the advent of computer FEA software such as NASTRAN, ANSYS, ABAQUS, Matlab, OPEN Foam, Simscale and the like. With the development of nanoscience, the researchers found difficulties in spending funds for nano related projects. The FEA has evolved as the affordable methodology and offers solutions to all complicated systems of research.