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- D. M. Tong, Kevin Singh, Leong Chuan Kwek, C. H. Oh
- Physical review letters
- 2005

In this Letter, we point out that the widely used quantitative conditions in the adiabatic theorem are insufficient in that they do not guarantee the validity of the adiabatic approximation. We alsoâ€¦ (More)

Quantum contextuality, as proved by Kochen and Specker, and also by Bell, should manifest itself in any state in any system with more than two distinguishable states and recently has beenâ€¦ (More)

- D. M. Tong, Erik SjÃ¶qvist, Leong Chuan Kwek, C. H. Oh
- Physical review letters
- 2004

A kinematic approach to the geometric phase for mixed quantal states in nonunitary evolution is proposed. This phase is manifestly gauge invariant and can be experimentally tested in interferometry.â€¦ (More)

- Sixia Yu, Qing Chen, Chengjie Zhang, Choy Heng Lai, C. H. Oh
- Physical review letters
- 2012

We show that a single Bell's inequality with two dichotomic observables for each observer, which originates from Hardy's nonlocality proof without inequalities, is violated by all entangled pureâ€¦ (More)

- Sixia Yu, Qing Chen, Choy Heng Lai, C. H. Oh
- Physical review letters
- 2008

We report the first nonadditive quantum error-correcting code, namely, a ((9, 12, 3)) code which is a 12-dimensional subspace within a 9-qubit Hilbert space, that outperforms the optimal stabilizerâ€¦ (More)

- Sixia Yu, JÃ¼rgen Bierbrauer, Ying Dong, Qing Chen, C. H. Oh
- IEEE Transactions on Information Theory
- 2013

We give necessary and sufficient conditions for the existence of stabilizer codes [[n, k, 3]] of distance 3 for qubits: n-k â‰¥ âŒˆlog<sub>2</sub> (3n + 1)âŒ‰ + âˆˆ<sub>n</sub>, where âˆˆ<sub>n</sub> = 1 if nâ€¦ (More)

- Jiangfeng Du, Thomas Durt, +5 authors Artur Ekert
- Physical review letters
- 2005

When prior partial information about a state to be cloned is available, it can be cloned with a fidelity higher than that of universal quantum cloning. We experimentally verify this intriguingâ€¦ (More)

- Xiao-Ming Lu, Sixia Yu, C. H. Oh
- Nature communications
- 2015

Fragile quantum features such as entanglement are employed to improve the precision of parameter estimation and as a consequence the quantum gain becomes vulnerable to noise. As an established toolâ€¦ (More)

- Xun-Li Feng, Chunfeng Wu, Hui Sun, C. H. Oh
- Physical review letters
- 2009

We introduce a new strongly driven dispersive atom-cavity interaction and develop a new scheme for implementing the nontrivial entangling gates for two logical qubits in decoherence-free subspacesâ€¦ (More)

- Jing-Ling Chen, Chunfeng Wu, L. C. Kwek, C. H. Oh
- Physical review letters
- 2004

We present a theorem that all generalized Greenberger-Horne-Zeilinger states of a three-qubit system violate a Bell inequality in terms of probabilities. All pure entangled states of a three-qubitâ€¦ (More)