



01191nas a2200145   4500008004100000245007100041210006900112260001400181300001600195490000700211520075200218100001900970700001900989856003701008       2008                        eng d00aEfficient scheme for one-way quantum computing in thermal cavities0 aEfficient scheme for oneway quantum computing in thermal cavitie  c2008/4/12  a2997 - 30040 v473 a  We propose a practical scheme for one-way quantum computing based on
efficient generation of 2D cluster state in thermal cavities. We achieve a
controlled-phase gate that is neither sensitive to cavity decay nor to thermal
field by adding a strong classical field to the two-level atoms. We show that a
2D cluster state can be generated directly by making every two atoms collide in
an array of cavities, with numerically calculated parameters and appropriate
operation sequence that can be easily achieved in practical Cavity QED
experiments. Based on a generated cluster state in Box$^{(4)}$ configuration,
we then implement Grover's search algorithm for four database elements in a
very simple way as an example of one-way quantum computing.
1 aYang, Wen-Xing1 aGong, Zhe-Xuan  uhttp://arxiv.org/abs/0704.2297v101229nas a2200145   4500008004100000245011300041210006900154260001500223300001600238490000700254520074000261100001901001700001901020856004401039       2007                        eng d00aPractical scheme for quantum dense coding between three parties using  microwave radiation in trapped ions
0 aPractical scheme for quantum dense coding between three parties   c2007/03/28  a1245 - 12520 v403 a  We propose a practical scheme for implementing two-dimension quantum dense
coding (QDC) between three parties through manipulating three ions confined in
microtraps addressed by microwaves and assisted by a magnetic field gradient.
The ions in our scheme are not required to be strictly cooled to the
vibrational ground state because single-qubit and multi-qubit operations are
made via Ising terms, in which the vibrational modes of the ions remain
unchanged throughout the scheme, rendering our scheme robust to the heating of
the ions. We also present the detailed steps and parameters for implementing
the three-party QDC experimentally and show that the proposed scheme is within
the current techniques of ion-trap experiments.
1 aYang, Wen-Xing1 aGong, Zhe-Xuan  uhttp://arxiv.org/abs/quant-ph/0702062v101118nas a2200145   4500008004100000245008400041210006900125260001500194300001400209490000700223520066000230100001900890700001900909856004400928       2007                        eng d00aSimple scheme for implementing the Deutsch-Jozsa algorithm in thermal  cavity
0 aSimple scheme for implementing the DeutschJozsa algorithm in the  c2007/01/05  a155 - 1610 v403 a  We present a simple scheme to implement the Deutsch-Jozsa algorithm based on
two-atom interaction in a thermal cavity. The photon-number-dependent parts in
the evolution operator are canceled with the strong resonant classical field
added. As a result, our scheme is immune to thermal field, and does not require
the cavity to remain in the vacuum state throughout the procedure. Besides,
large detuning between the atoms and the cavity is not necessary neither,
leading to potential speed up of quantum operation. Finally, we show by
numerical simulation that the proposed scheme is equal to demonstrate the
Deutsch-Jozsa algorithm with high fidelity.
1 aYang, Wen-Xing1 aGong, Zhe-Xuan  uhttp://arxiv.org/abs/quant-ph/0611225v2