Basic Research

Quantum Cryptography

Quantum cryptography is the art of using quantum mechanical effects, like the celebrated quantum no-cloning principle, to achieve information security in an untrusted environment. For a basic overview of quantum cryptography, please see our NUS news article.

In this area, our group is primarily interested in the security of quantum key distribution (QKD) and quantum random number generation (QRNG). Our expertise is in the development of security proof techniques for practical quantum cryptosystems, although in the recent years we have also started working on device-independent quantum cryptography.

In order to have a universal toolbox for computing secure key rates, we take an numerical approach, using mathematical methods like semi-definite programming and entropy inequalities to derive tight and reliable security bounds. You can find some of our latest results below:

  1. Computing secure key rates for quantum key distribution with untrusted devices (accepted as a contributed talk at both QCRYPT 2019 and QIP 2020); video from QIP.

  2. Versatile security analysis of measurement-device-independent quantum key distribution (accepted as a contributed talk at QCRYPT 2019).

  3. Characterising the correlations of prepare-and-measure quantum networks (accepted at QCRYPT 2018) video link.

Beside these topics, we are also constantly thinking of new protocols for quantum cryptography. Some recent results along the lines of two-way classical communication and coherent-state quantum key distribution can be found here:

  1. Advantage distillation for device-independent quantum key distribution; Phys.org News cover.

  2. Practical Quantum Key Distribution with Non-Phase-Randomized Coherent States.

  3. Symmetric blind information reconciliation for quantum key distribution.

For more information of our group research, please feel free to contact Charles or any of the group members.

Translational Research

Quantum Integrated Photonics

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Classical Post-Processing Algorithms