ScholarBank@NUShttps://scholarbank.nus.edu.sgThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Thu, 28 Oct 2021 08:28:13 GMT2021-10-28T08:28:13Z5031- Realization of quantum circuits in fock spacehttps://scholarbank.nus.edu.sg/handle/10635/97769Title: Realization of quantum circuits in fock space
Authors: Ma, L.; Li, Y.
Abstract: In this letter, by using the method we offered in our paper [L. Ma and Y.D. Zhang, Commun. Theor. Phys. (Beijing, China) 36 (2001) 119], some extended quantum logic gates, such as quantum counter, quantum adder, are studied and their expressions are given. It may be useful for us to study the more complicated quantum logic circuits deeply.
Sat, 15 May 2004 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/977692004-05-15T00:00:00Z
- White noise in quantum random walk search algorithmhttps://scholarbank.nus.edu.sg/handle/10635/98583Title: White noise in quantum random walk search algorithm
Authors: Ma, L.; Du, J.-F.; Li, Y.; Li, H.; Kwek, L.C.; Oh, C.H.
Abstract: The quantum random walk is a possible approach to construct new quantum search algorithms. It has been shown by Shenvi et al. [Phys. Rev. A 67 (2003) 52307 that a kind of algorithm can perform an oracle search on a database of N items with O(N 1/2) calling to the oracle, yielding a speedup similar to other quantum search algorithms. We study the effect of white or Gaussian noise on this algorithm. The algorithm loses efficiency when noise is added. We also show that noise on the target state plays a more important role than that on other states. Finally we compare the effects of similar types of noise in the quantum random walk search algorithm and Grover's search algorithm. ©2006 Chinese Physical Society and IOP Publishing Ltd.
Sat, 01 Apr 2006 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/985832006-04-01T00:00:00Z
- Operator-sum representation of time-dependent density operators and its applicationshttps://scholarbank.nus.edu.sg/handle/10635/97435Title: Operator-sum representation of time-dependent density operators and its applications
Authors: Tong, D.M.; Kwek, L.C.; Oh, C.H.; Chen, J.-L.; Ma, L.
Abstract: An arbitrary time-dependent density operator of an open system was described in terms of an operator-sum representation. Its initial condition and the path of its evolution in the state space were ignored. A general expression of Kraus operators for arbitrary time-dependent density operator was obtained. The significance of the results was proved through several examples.
Sat, 01 May 2004 00:00:00 GMThttps://scholarbank.nus.edu.sg/handle/10635/974352004-05-01T00:00:00Z