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Category: quantum physics – Page 108

How pointing errors impact quantum key distribution systems

Quantum key distribution (QKD) is an emerging communication technology that utilizes quantum mechanics principles to ensure highly secure communication between two parties. It enables the sender and receiver to generate a shared secret key over a channel that may be monitored by an attacker. Any attempt to eavesdrop introduces detectable errors in the quantum signals, allowing communicating parties to detect if communication is compromised via QKD protocols.

Among the various parameters that influence the performance of QKD systems, pointing error, a misalignment between the transmitter and receiver, is one of the most important. Such misalignment can arise from mechanical vibrations, atmospheric turbulence, and/or inaccuracies in the alignment mechanisms.

Despite its importance, very few studies have examined pointing error in a comprehensive manner for QKD optical wireless communication (OWC) systems.

Building the world’s first open-source quantum computer

Researchers from the University of Waterloo’s Faculty of Science and the Institute for Quantum Computing (IQC) are prioritizing collaboration over competition to advance quantum computer development and the field of quantum information. They are doing this through Open Quantum Design (OQD), a non-profit organization that boasts the world’s first open-source, full stack quantum computer.

OQD was co-founded in 2024 by faculty members in the Department of Physics and Astronomy and IQC, Drs. Crystal Senko, Rajibul Islam and Roger Melko, alongside CEO Greg Dick (BSc ‘93).

The group is helping reshape how quantum research is shared, opening doors for the next generation of quantum scientists, and even seeding new quantum startups.

Observing the positronium beam as a quantum matter wave for the first time

One of the discoveries that fundamentally distinguished the emerging field of quantum physics from classical physics was the observation that matter behaves differently at the smallest scales. A key finding was wave-particle duality, the revelation that particles can exhibit wave-like properties.

This duality was famously demonstrated in the double-slit experiment. When electrons were fired through two slits, they created an interference pattern of light and dark fringes on a detector. This pattern showed that each electron behaved like a wave, with its quantum wave-function passing through both slits and interfering with itself. The same phenomenon was later confirmed for neutrons, helium atoms, and even large molecules, making matter-wave diffraction a cornerstone of quantum mechanics.

Stealth quantum sensors unlock possibilities anywhere GPS doesn’t work

As commercial interest in quantum technologies accelerates, entrepreneurial minds at the University of Waterloo are not waiting for opportunities—they are creating them.

Among them is Alex Maierean (MMath ‘24), CEO of Phantom Photonics and part-time Ph.D. student at the Institute for Quantum Computing (IQC). Her startup is developing ultra-sensitive quantum sensors that can filter out background noise and detect the faintest signals, even down to a single photon—the smallest unit of light. This offers new levels of precision and stealth for industries operating in extreme environments, from the depths of the ocean to outer space.

Launched in 2023, the Velocity startup emerged from fundamental research at an IQC lab led by Dr. Thomas Jennewein, IQC affiliate and adjunct faculty in the Department of Physics and Astronomy. Today, the startup is based at Velocity where it has established a dedicated lab space to continue to develop its quantum sensor technology and build its core team.

Year 2100: Future Technologies that Will Rule the World

The androids of the future will be the distant results of synthetic biology and not silicon.

🚀 Step into a world of boundless innovation as we take you on a journey through the awe-inspiring technologies that await humanity in the 22nd century! 🌌 From advancements in space exploration to mind-boggling leaps in artificial intelligence, this captivating video offers a glimpse into the cutting-edge breakthroughs that will redefine the very fabric of human existence.

🌐 Witness the birth of extraterrestrial civilizations as humans venture further into space, exploring distant planets and establishing self-sustaining colonies. Experience the seamless integration of artificial intelligence into our daily lives, transforming how we interact with technology and creating new possibilities for societal progress. Prepare to be amazed by quantum computing’s extraordinary power, revolutionizing problem-solving and opening doors to scientific discoveries previously deemed impossible.

🌿 Delve into the world of sustainable marvels, where eco-friendly innovations mend our relationship with the environment and pave the way for a greener, more harmonious future. Explore the ethical implications of biotechnology advancements, which offer insights into longevity and human potential. This video paints an inspiring picture of the limitless possibilities and profound transformations that lie ahead in the remarkable world of 22nd-century technologies. Like, share, and subscribe to our channel for more captivating glimpses of the ever-evolving world of tomorrow. 🌟🔮🌠 #FutureTechnologies #22ndCenturyInnovations #EmbracingTomorrow

What Is the Universe, Really? | Leonard Susskind

When we talk about the universe, we usually imagine space filled with galaxies, stars, and matter expanding endlessly in all directions. It feels natural to think of the universe as a vast container — a place where everything exists. But modern theoretical physics suggests that this picture may be deeply misleading.

In this video, we explore a more fundamental question: what is the universe really made of? Is it space? Matter? Energy? Or something far more abstract than our everyday intuition allows?

Drawing on ideas associated with Leonard Susskind, this long-form exploration challenges the assumption that the universe is a physical stage where reality takes place. Instead, physics increasingly points toward a universe defined not by objects and locations, but by information, relationships, and boundaries.

Black hole physics, quantum theory, and modern cosmology have forced scientists to rethink the foundations of reality. In some of the deepest descriptions of nature, space and time no longer appear as fundamental ingredients. What we experience as a three-dimensional universe may be an emergent structure — a convenient description rather than the true underlying reality.

Rather than focusing on equations, this video emphasizes intuition and conceptual understanding. Through thought experiments and simple analogies, we examine why the universe feels like a place, why that picture works so well at human scales, and why it may break down at the most fundamental level.

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