Advancing the frontiers of quantum science and engineering

Abstract: The traditional model for quantum computing utilizes qubits and when factoring in noise uses qubit quantum error-correcting codes. In physics, however, there are very few true qubits. Qubits are typically a pair of states selected from a far richer physical system, which means we coarse-grain some of the error pathways and toss away a lot of possible computational space. I will discuss local-dimension-invariant (LDI) forms, an extension of the stabilizer framework, for translating already known stabilizer codes from qubit (or qudit) systems to systems with more degrees of freedom--including the infinite cases and where the locations don't all have the same degrees of freedom. This provides explicit constructions for codes with optimal parameter (n,k, and d) codes for CV registers, GKP-like registers, rotor registers, prime and composite valued registers, as well as mixed-register devices. This talk will be based primarily on the following works: Gunderman, L. G. (2020). Local-dimension-invariant qudit stabilizer codes. Physical Review A, 101(5), 052343. Gunderman, L. G. (2024). Stabilizer codes with exotic local-dimensions. Quantum, 8, 1249. Gunderman, L. G. (2025). Beyond integral-domain stabilizer codes. Physical Review A, 112(6), 062430. Dongre, H., & Gunderman, L. G. (2026). Mixed-register Stabilizer Codes: A Coding-theoretic Perspective. arXiv preprint arXiv:2603.28459.

A pre-eminent problem of modern physics is to reconcile the disparity between the laws of quantum physics – which apply at the small scale – and the laws of gravity – that apply at the large scale. This talk will motivate the nature of the fundamental problem and highlight some of the ideas we are currently pursuing to address it. In particular, a decisive confrontation of gravity and quantum theory calls for mechanical objects, massive enough to measurably gravitate with each other, prepared in quantum states of their motion. We will describe the ideas and the tools that could pave the way towards such an experiment.

Abstract: Exponential tilting is a classical technique that changes the emphasis placed on different outcomes by reweighting them exponentially. This thesis develops a quantum framework based on this idea and applies it to three areas: quantum state transformation, quantum learning, and variational quantum optimization. We introduce new tilted quantum models for updating quantum states, learning from noisy or uneven data, and designing more effective optimization objectives. Across these settings, the tilt parameter provides a flexible way to balance competing goals, such as accuracy, robustness, trainability, and measurement cost. The results show that exponential tilting offers a common mathematical principle for understanding and designing quantum algorithms and may support the development of more robust and practical methods in quantum information processing, machine learning, and optimization.

Abstract: Coherently-driven Kerr-nonlinear systems offer an invaluable engineering flexibility for the generation of quantum states of visible light, at the cost of remaining confined within the set of Gaussian states. In a series of experimental and theoretical work performed in discrete modes Kerr-nonlinear microresonators, we show that by manipulating the intracavity mean-field and the quantum fluctuations components separately, we can create surprisingly deep and diverse quantum photonic resources, beyond squeezed and heralded states.

Abstract: Quantum information is notoriously fragile: interactions with the environment inevitably introduce noise, causing stored information to degrade over time. This raises a fundamental question: Can a noisy quantum memory ever preserve information perfectly, no matter how long we wait?In this talk I will present a complete answer to this question for quantum memories undergoing discrete-time Markovian evolution. We identify the precise dynamical properties that make perfect long-term storage impossible for classical and quantum information, and derive universal upper bounds on the time after which such dynamics inevitably destroy the possibility of perfect retrieval. Conversely, whenever perfect long-term storage is possible, we show that the information must be encoded in the peripheral space of the dynamics. This leads to explicit formulas for the maximum rate at which classical and quantum information can be stored perfectly in the memory. I will also briefly discuss the more realistic setting in which a small probability of decoding error is allowed. This is based on joint work with Satvik Singh and Mizanur Rahaman.

The ninth edition of the Workshop on Quantum Technologies on Small Satellites will take place 19-20 October 2026 in Singapore. The two-day event will focus on (small) satellite technologies and quantum experiments in space – including both space-based and ground architectures, from component through to mission design. Participants are given the opportunity to share ideas, directions, and concerns to advance the state of the field. The workshop is co-hosted by the QTX research forum led by Alexander Ling of NUS and Markus Krutzik of Humboldt-Universität zu Berlin and Ferdinand-Braun-Institut, Leibniz-institut für Höchstfrequenztechnik. The forum met previously in Germany (2018, 2024), UK (2019), United Arab Emirates (2023) and online (2020, 2021).

The Quantum Information Processing Conference (QIP) is the largest quantum information processing technology conference, which annually gathers the world’s brightest researchers and industry leaders for a week long program to present and discuss the latest achievements in quantum computing, cryptography, information theory, mathematics and physics. Recent editions have drawn nearly 1000 participants. In 2027, CQT will host the 30th edition of this conference in Singapore. QIP2027 will take place 20-26 February 2027.

The International Conference on Women in Physics (ICWIP) of the International Union of Pure and Applied Physics (IUPAP) will take place in the National University Singapore (NUS) during 7-11 June 2027, hosted by the Physics Department, NUS and the Centre for Quantum Technologies, Singapore. The ICWIP2027 is the 9th in a series of triennial conferences by IUPAP since 2002 that brings together practitioners from all over the world in order to deliberate on both topics in physics and processes within physics practice, with the goal of transforming physics into a welcoming inclusive enterprise for everyone. The conference will feature inspiring keynote talks by eminent women scholars, sessions where participants can present their own research in physics and on equity and inclusion in physics, interactive workshops to engage with the barriers to equity and inclusion in physics, call-to-action sessions on recommendations for the profession and more...