Advancing the frontiers of quantum science and engineering

Abstract: Organised by Singapore’s Centre for Quantum Technologies (CQT), the hackamonth is an innovative approach to hackathons: a month-long, collaborative experience where participants work on quantum computing for meaningful problems. Typical hackathons are short and competitive, ending with prizes. With our hackamonth, we want to have real scientific impact.

Abstract: The advancement of scalable quantum technologies relies on the ability to identify quantum resources and protect them from environmentally induced decoherence. This thesis addresses these challenges by proposing theoretical and experimental frameworks divided into two investigations: detection of non-classicality and entanglement, the reversal of quantum information loss. The first part introduces the even-parity precession protocol to detect the quantumness and entanglement of a uniformly precessing system. We begin by introducing Tsirelson's original precession protocol and and its extension on odd-parity precession protocol. While the odd-parity protocol provides a general method on detecting the quantumness and entanglement, it misses all the quantum states that commute with the parity operator. To resolve this blind spot, we raise the even-parity precession protocol with a redefined score. By violating the classical upper bound, we can claim that the system posses the non-classicality and entanglement we want. Both odd-parity and even-parity precession protocol does not require simultaneous or sequential measurements, which avoid the risk of false positives. The second part of the thesis focuses on recovery of information loss of quantum channels through quantum channels. We start from the historical origin of Petz recovery map and its performance theoretically. While the Petz map is widely explored theoretically, practical physical implementations have been limited. We investigate the physical realization of the Petz recovery map using optics and photonic system. This part outlines the theoretical design and the subsequent experimental realization of Petz recovery map, which provide a practical guidance for the implementation of Petz recovery map. By evaluating the recovery performance, we show that Petz recovery map is near optimal.

Abstract: QCamp is a one-week summer school for curious and inquisitive minds who wish to explore and understand the physical laws that govern the world’s smallest scales: quantum physics. The scope of QCamp is to provide vivid demonstrations of these laws, offer career advice, as well as to help students build a technical foundation for independent exploration of this world. QCamp is organised by the Centre for Quantum Technologies (CQT) at the National University of Singapore.

Abstract: Scaling qubit-based quantum systems requires effective strategies to suppress errors arising from inhomogeneous interactions with the environment. For qubits, commonly used techniques include the Hahn echo, which employs an intermediate Pauli-X operation to refocus inhomogeneous dephasing, as well as multi-pulse dynamical decoupling sequences. Extending such error-suppression methods to higher-dimensional systems is of key interest, as qudits promise significant advantages for quantum simulation, quantum information processing and quantum sensing. In this work, we experimentally demonstrate a generalized Hahn-echo sequence for qutrit using direct SU(3) gates. The SU(3) gates are designed via optimal control and applied to a tripod system in an ultracold atomic ensemble in free space. The propagation geometry of the tripod lasers makes the generalized Hahn-echo sequence equivalent to a Mach-Zehnder atomic interferometer consisting of three spatially separated paths. This makes the platform promising for quantum sensing of rotations and inertial forces.

The one-day Flash QCamp for curious and inquisitive minds to get a taster in quantum technologies.

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...