| 1. |
- Brink, Lars, 1943, et al.
(author)
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Looking Beyond the Frontiers of Science : Dedicated to the 80th Birthday of K.K. Phua
- 2022
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Book (other academic/artistic)abstract
- Professor Kok Khoo Phua is the Founding Director and Emeritus Professor of the Institute of Advanced Studies (IAS) at Nanyang Technological University (NTU) and Adjunct Professor of Department of Physics both at Nanyang Technological University (NTU) and National University of Singapore (NUS). He is the Chairman and Editor-in-Chief of World Scientific Publishing Co Pte Ltd. When he was elected a Fellow of the American Physical Society (APS) in 2009, the citation read: “For tireless efforts to strengthen scientific research throughout Asia and promote international physics education and scholarly exchanges, and for enriching science and education through the World Scientific Publishing Co. he founded.” This unique volume on the occasion of his 80th birthday is a compilation of tributes from his friends who have known him for decades along with scientific articles that celebrate his visionary approach to promote science worldwide.
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| 2. |
- Brink, Lars, 1943, et al.
(author)
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Preface
- 2022
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In: Looking Beyond the Frontiers of Science: Dedicated to the 80th Birthday of K.K. Phua. - : WORLD SCIENTIFIC. ; , s. v-vi
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Book chapter (other academic/artistic)
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| 3. |
- Chen, Jing-Ling, et al.
(author)
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Quantum contextuality for a relativistic spin-1/2 particle
- 2013
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In: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 87:2, s. 022109-
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Journal article (peer-reviewed)abstract
- The quantum predictions for a single nonrelativistic spin-1/2 particle can be reproduced by noncontextual hidden variables. Here we show that quantum contextuality for a relativistic electron moving in a Coulomb potential naturally emerges if relativistic effects are taken into account. The contextuality can be identified through the violation of noncontextuality inequalities. We also discuss quantum contextuality for the free Dirac electron as well as the relativistic Dirac oscillator. DOI: 10.1103/PhysRevA.87.022109
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| 4. |
- Tong, D.M., et al.
(author)
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Kinematic approach to mixed state geometric phase in nonunitary evolution
- 2004
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In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 93:8, s. 080405-
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Journal article (peer-reviewed)abstract
- 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. It leads to well-known results when the evolution is unitary.
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| 5. |
- Tong, D.M., et al.
(author)
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Kinematic approach to off-diagonal geometric phases of nondegenerate and degenerate mixed states
- 2005
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In: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 71:3, s. 032106-
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Journal article (peer-reviewed)abstract
- Off-diagonal geometric phases have been developed in order to provide information of the geometry of paths that connect noninterfering quantal states. We propose a kinematic approach to off-diagonal geometric phases for pure and mixed states. We further extend the mixed state concept proposed in [Phys. Rev. Lett. 90, 050403 (2003)] to degenerate density operators. The first and second order off-diagonal geometric phases are analyzed for unitarily evolving pairs of pseudopure states.
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| 6. |
- Tong, D.M., et al.
(author)
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Relation between geometric phases of entangled bi-partitesystems and their subsystems
- 2003
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In: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 68, s. 022106-
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Journal article (peer-reviewed)abstract
- This paper focuses on the geometric phase of entangled states of bi-partite systems under bi-local unitary evolution. We investigate the relation between the geometric phase of the system and those of the subsystems. It is shown that (1) the geometric phase of cyclic entangled states with non-degenerate eigenvalues can always be decomposed into a sum of weighted non-modular pure state phases pertaining to the separable components of the Schmidt decomposition, though the same cannot be said in the non-cyclic case, and (2) the geometric phase of the mixed state of one subsystem is generally different from that of the entangled state even by keeping the other subsystem fixed, but the two phases are the same when the evolution operator satisfies conditions where each component in the Schmidt decomposition is parallel transported.
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| 7. |
- Xu, G.F., et al.
(author)
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Non-adiabatic holonomic quantum computation in decoherence-free subspaces
- 2012
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In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 109:17
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Journal article (peer-reviewed)abstract
- Quantum computation that combines the coherence stabilization virtues of decoherence-free subspaces and the fault tolerance of geometric holonomic control is of great practical importance. Some schemes of adiabatic holonomic quantum computation in decoherence-free subspaces have been proposed in the past few years. However, non-adiabatic holonomic quantum computation in decoherence-free subspaces, which avoids long run-time requirement but with all the robust advantages, remains an open problem. Here, we demonstrate how to realize non-adiabatic holonomic quantum computation in decoherence-free subspaces. By using only three neighboring physical qubits undergoing collective dephasing to encode one logical qubit, we realize a universal set of quantum gates.
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| 8. |
- Zhu, Hui Hui, et al.
(author)
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Large-scale photonic network with squeezed vacuum states for molecular vibronic spectroscopy
- 2024
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In: Nature Communications. - 2041-1723 .- 2041-1723. ; 15:1
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Journal article (peer-reviewed)abstract
- Although molecular vibronic spectra generation is pivotal for chemical analysis, tackling such exponentially complex tasks on classical computers remains inefficient. Quantum simulation, though theoretically promising, faces technological challenges in experimentally extracting vibronic spectra for molecules with multiple modes. Here, we propose a nontrivial algorithm to generate the vibronic spectra using states with zero displacements (squeezed vacuum states) coupled to a linear optical network, offering ease of experimental implementation. We also fabricate an integrated quantum photonic microprocessor chip as a versatile simulation platform containing 16 modes of single-mode squeezed vacuum states and a fully programmable interferometer network. Molecular vibronic spectra of formic acid and thymine under the Condon approximation are simulated using the quantum microprocessor chip with high reconstructed fidelity (> 92%). Furthermore, vibronic spectra of naphthalene, phenanthrene, and benzene under the non-Condon approximation are also experimentally simulated. Such demonstrations could pave the way for solving complicated quantum chemistry problems involving vibronic spectra and computational tasks beyond the reach of classical computers.
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