- Kwek, Leong Chuan

###### Options

# Kwek, Leong Chuan

Preferred name

Kwek, Leong Chuan

Email

leongchuan.kwek@nie.edu.sg

Department

Natural Sciences & Science Education (NSSE)

Personal Site(s)

Academic Profile

Dataverse Researcher Profile

ORCID

Scopus Author ID

7006483792

45 results Back to results

### Filters

##### Date

##### Author

##### Has files

##### Type

### Settings

Sort By

Results per page

Now showing 1 - 10 of 45

- PublicationOpen AccessAll-versus-nothing proof of Einstein-Podolsky-Rosen steering(Springer, 2013)
;Chen, Jing-Ling ;Ye, Xiang-Jun ;Wu, Chunfeng ;Su, Hong-Yi ;Cabello, Adan; Oh, Choo HiapShow more Einstein-Podolsky-Rosen steering is a form of quantum nonlocality intermediate between entanglement and Bell nonlocality. Although Schro¨dinger already mooted the idea in 1935, steering still defies a complete understanding. In analogy to ‘‘all-versus-nothing’’ proofs of Bell nonlocality, here we present a proof of steering without inequalities rendering the detection of correlations leading to a violation of steering inequalities unnecessary. We show that, given any two-qubit entangled state, the existence of certain projective measurement by Alice so that Bob’s normalized conditional states can be regarded as two different pure states provides a criterion for Alice-to-Bob steerability. Asteering inequality equivalent to the all-versus-nothing proof is also obtained. Our result clearly demonstrates that there exist many quantum states which do not violate any previously known steering inequality but are indeed steerable. Our method offers advantages over the existing methods for experimentally testing steerability, and sheds new light on the asymmetric steering problem.Show more WOS© Citations 65Scopus© Citations 67 373 184 - PublicationOpen AccessNoncyclic geometric phase for neutrino oscillation
Show more We provide explicit formulas for the noncyclic phases or Pancharatnam phases of neutrino oscillations. Since the Pancharatnam phase is a generalization of the Berry phase, our results generalize the previous findings for the Berry phase in a recent paper [M. Blasone, P. A. Henning, and G. Vitiello, Phys. Lett. B 466 262 (1999)]. Unlike the Berry phase, the noncyclic phase offers a distinctive advantage in terms of measurement and prediction. In particular, for three-flavor mixing, our explicit formula offers an alternative means of determining the CP-violating phase. Our results can also be extended easily to explore the noncyclic phase associated with neutron-antineutron oscillations.Show more WOS© Citations 24Scopus© Citations 24 301 158 - PublicationOpen AccessQuantum tunneling time
Show more We present a calculation of quantum tunneling time based on the transition duration of wave peak from one side of a barrier to the other. In our formulation, the tunneling time comprises a real and an imaginary part. The real part is an extension of the phase tunneling time with quantum corrections whereas the imaginary time is associated with energy derivatives of the probability amplitudes.Show more WOS© Citations 13Scopus© Citations 12 159 219 - PublicationOpen AccessRepeat-until-success distributed quantum computation by using single-photon interference at a beam splitter
Show more A repeat-until-success (RUS) measurement-based scheme for the implementation of the distributed quantum computation by using single-photon interference at a 50:50 beam splitter is proposed. It is shown that the 50:50 beam splitter can naturally project a suitably encoded matter-photon state to either a desired entangling gate-operated state of the matter qubits or to their initial state when the photon is detected. The recurrence of the initial state permits us to implement the desired entangling gate in a RUS way. To implement a distributed quantum computation we suggest an encoding method by means of the effect of dipole-induced transparency proposed recently [E. Waks and J. Vuckovic, Phys. Rev. Lett. 96, 153601 (2006)]. The effects of the unfavorable factors on our scheme are also discussed.Show more WOS© Citations 4Scopus© Citations 4 139 155 - PublicationOpen AccessCoincidence Bell inequality for three three-dimensional systems(American Physical Society, 2004)
;Acin, A. ;Chen, Jing-Ling ;Gisin, N. ;Kaszlikowski, Dagomir; ;Oh, Choo HiapZukowski, MarekShow more We construct a Bell inequality for coincidence probabilities on a three three-dimensional (qutrit) system. We show that this inequality is violated when each observer measures two noncommuting observables, defined by the so-called unbiased six-port beam splitter, on a maximally entangled state of two qutrits. The strength of the violation agrees with the numerical results presented by Kaszlikowski et al. , quant-ph/0202019. It is proven that the inequality defines facets of the polytope of local variable models.Show more WOS© Citations 37Scopus© Citations 38 350 187 - PublicationOpen AccessQuartic anharmonic oscillator and non-Hermiticity
Show more Using a group-theoretic approach, we investigate some new peculiar features of a general quartic anharmonic oscillator. When the coefficient of the quartic term is positive and the potential is differentiable, we find that continuity of the derivative of the potential forces the nonexistence of an analytic wave function. For the case in which the coefficient of the quartic term is negative, we find that normalizability of the wave function requires non-Hermiticity of the Hamiltonian. Finally, we apply our method to gain some insight on the double well potential.Show more WOS© Citations 16Scopus© Citations 2 152 246 - PublicationOpen AccessRelation between geometric phases of entangled bipartite systems and their subsystems(American Physical Society, 2003)
;Tong, Dianmin ;Sjöqvist, Erik; ;Oh, Choo HiapEricsson, MarieShow more This paper focuses on the geometric phase of entangled states of bipartite systems under bilocal 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 nondegenerate eigenvalues can always be decomposed into a sum of weighted nonmodular pure state phases pertaining to the separable components of the Schmidt decomposition, although the same cannot be said in the noncyclic case, and (2) the geometric phase of the mixed state of one subsystem is generally different from that of the entangled state even if the other subsystem is kept fixed, but the two phases are the same when the evolution operator satisfies conditions where each component in the Schmidt decomposition is parallel transported.Show more WOS© Citations 42 112 134Scopus© Citations 2 - PublicationOpen AccessClauser-Horne inequality for three-state systems(American Physical Society, 2002)
;Kaszlikowski, Dagomir; ;Chen, Jing-Ling ;Zukowski, MarekOh, Choo HiapShow more We show a new Bell-Clauser-Horne inequality for two entangled three-dimensional quantum systems (so-called qutrits). This inequality is not violated by a maximally entangled state of two qutrits observed through a symmetric three-input- and three-output-port beam splitter only if the amount of noise in the system is greater than (11−63 √ )/2≈0.308. This result is in a perfect agreement with the previous numerical calculations presented in Kaszlikowski et al. [Phys. Rev. Lett. 85, 4418 (2000)]. Moreover, we prove that for noiseless case, the necessary and sufficient condition for the threshold quantum efficiency of detectors below which there is no violation of local realism for the optimal choice of observables is equal to 6(15−43 √ )/59≈0.821. This efficiency result again agrees with the numerical predictions.Show more WOS© Citations 97 322 269Scopus© Citations 108 - PublicationOpen AccessExperimental quantum multimeter and one-qubit fingerprinting(American Physical Society, 2006)
;Du, Jiangfeng ;Zou, Ping ;Peng, Xinhua ;Oi, Daniel K. L.; ;Oh, Choo HiapEkert, Artur K.Show more There has been much recent effort to realize quantum devices in many different physical systems. Among them, nuclear magnetic resonance (NMR) has been the first to demonstrate nontrivial quantum algorithms with small numbers of qubits and hence is a prototype for the key ingredients needed to build quantum computers. An important building block in many quantum applications is the scattering circuit, which can be used as a quantum multimeter to perform various quantum information processing tasks directly without recourse to quantum tomography. We implement in NMR a three-qubit version of the multimeter and also demonstrate a single-qubit fingerprinting.Show more WOS© Citations 22 339 266Scopus© Citations 23 - PublicationOpen AccessElectronic entanglement purification scheme enhanced by charge detections
Show more We present an entanglement purification scheme for the mixed entangled states of electrons with the aid of charge detections. Our scheme adopts the electronic polarizing beam splitters rather than the controlled-NOT (CNOT) operations, but the total successful probability of our scheme can reach the quantity as large as that of the CNOT-operation-based protocol and twice as large as that of linear-optics-based protocol for the purification of photonic entangled states. Thus our scheme can achieve a high successful prabability without the usage of CNOT operations.Show more WOS© Citations 39 126 124Scopus© Citations 41