Future undergraduate students

Researchers from IQC, MIT, and the University of Illinois at Urbana-Champaign have developed a technique for better identification and control of microscopic defects in diamond, as detailed in PRX Quantum, paving the way for the creation of larger qubit systems for enhanced quantum sensing. This breakthrough, led by Alexandre Cooper-Roy, represents a significant advancement in quantum sensing, offering potential revolutionary impacts across various industries and scientific fields.

Congratulations to Institute for Quantum Computing (IQC) faculty members Dr. David Cory, Dr. Thomas Jennewein and Dr. Chris Wilson, who have each received approximately $3 million in funding for advancing their research into the real-world applications of quantum technology.

Researchers at the Institute for Quantum Computing are leading Canada’s first quantum satellite to protect tomorrow’s data.

In our increasingly digital and interconnected world, graduate students like Kimia Mohammadi constantly innovate to stay ahead of emerging security risks. She is part of a national team creating Canada’s first quantum satellite, currently scheduled for launch in 2025. The Quantum EncrYption and Science Satellite (QEYSSat) mission will be a demonstration of secure ground-to-space quantum communication.

Unruh phenomena and thermalization for qudit detectors

Quantum-Nano Centre, 200 University Ave West, Room QNC 1201 Waterloo, ON CA N2L 3G1

The Unruh effect is the flat space analogue to Hawking radiation, describing how an observer in flat spacetime perceives the quantum vacuum state to be in a thermal state when moving along a constantly accelerated trajectory. This effect is often described operationally using the qubit-based Unruh-DeWitt detector.

We study Unruh phenomena for more general qudit detectors coupled to a quantized scalar field, noting the limitations to the utility of the detailed balance condition as an indicator for Unruh thermality of higher-dimensional qudit detector models. We illustrate these limitations using two types of qutrit detector models based on the spin-1 representations of SU(2) and the non-Hermitian generalization of the Pauli observables (the Heisenberg-Weyl operators).

[2309.04598] Unruh phenomena and thermalization for qudit detectors (arxiv.org)

En francais

Diamonds are one of the most sought-after and versatile gemstones in the world, with purposes beyond jewelry and drill tips. In quantum research, diamonds are frequently studied because of the presence of special defects called colour centers, which can act as a quantum bit, or qubit, to store information in quantum systems.

Dr. Mohammad Soltani, a postdoctoral fellow at the Institute for Quantum Computing (IQC) is studying ways to implement patterns in diamonds for quantum applications. Recently, his experiments led to a miniscule but recognizable pattern: IQC’s logo, etched into a 2.5 mm square diamond. The smallest logo produced measured just 20 micrometers — about one fourth the width of a single human hair. 

Tight bounds for Pauli channel learning with and without entanglement

Quantum Nano Centre, 200 University Ave West, Room QNC 1201
Waterloo, ON CA N2L 3G1

Quantum entanglement is a crucial resource for learning properties from nature, but a precise characterization of its advantage can be challenging. In this work, we consider learning algorithms without entanglement as those that only utilize separable states, measurements, and operations between the main system of interest and an ancillary system. Interestingly, these algorithms are equivalent to those that apply quantum circuits on the main system interleaved with mid-circuit measurements and classical feedforward. Within this setting, we prove a tight lower bound for Pauli channel learning without entanglement that closes the gap between the best-known upper bound. In particular, we show that Θ(n^2/ε^2) rounds of measurements are required to estimate each eigenvalue of an n-qubit Pauli channel to ε error with high probability when learning without entanglement. In contrast, a learning algorithm with entanglement only needs Θ(1/ε^2) copies of the Pauli channel. Our results strengthen the foundation for an entanglement-enabled advantage for Pauli noise characterization. We will talk about ongoing experimental progress in this direction.

Reference: Mainly based on [arXiv: 2309.13461]

Wednesday, December 13, 2023

Quantum Q&A with Melissa Henderson

En francais

Dr. Melissa Henderson is a researcher at the Institute for Quantum Computing (IQC) and the University of Waterloos Department of Physics and Astronomy. Her research considers the scattering of neutral particles known as neutrons, and their relation to quantum materials.

En francais

In an exhilarating convergence of education and quantum information, Quantum for Educators hosted its 9th annual class from December 1 to 3, 2023. Hosted by the Institute for Quantum Computing (IQC) at the University of Waterloo, this professional development workshop left an indelible mark on secondary school science teachers passionate about bringing the marvels of quantum information science and technology into their classrooms.