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1.
This paper proposes a simple scheme to generate a
four-atom entangled cluster state in cavity quantum electrodynamics.
With the assistantce of a strong classical field the cavity is only
virtually excited and no quantum information will be transferred
from the atoms to the cavity during the preparation for a four-atom
entangled cluster state, and thus the scheme is insensitive to the
cavity field states and cavity decay. Assuming that deviation of
laser intensity is 0.01 and that of simultaneity for the interaction
is 0.01, it shows that the fidelity of the resulting four-atom
entangled cluster state is about 0.9886. The scheme can also be
used to generate a four-ion entangled cluster state in a hot
trapped-ion system. Assuming that deviation of laser intensity is
0.01, it shows that the fidelity of the resulting four-ion entangled
cluster state is about 0.9990. Experimental feasibility for
achieving this scheme is also discussed. 相似文献
2.
In this paper, we propose a physical scheme to realize quantum SWAP
gate by using a large-detuned single-mode cavity field and two
identical Rydberg atoms. It is shown that the scheme can also be used
to create multi-atom cluster state. During the interaction between
atom and cavity, the cavity is only virtually excited and thus the
scheme is insensitive to the cavity field states and cavity decay.
With the help of our scheme it is very simple to prepare the $N$-atom
cluster state with perfect fidelity and probability. The practical
feasibility of this method is also discussed. 相似文献
3.
We propose a method of generating a four-atom entangled cluster state by considering two kinds of the atoms–cavity field interaction in cavity QED. During the preparation the cavity is only virtually excited no quantum information will be transferred from the atoms to the cavity and thus the scheme is insensitive to the cavity field states and cavity decay. The scheme can also be used to generate the cluster state for the trapped ions. 相似文献
4.
Generation of four-atom cluster states in thermal cavity and implementing remote controlled not gate 总被引:2,自引:0,他引:2 下载免费PDF全文
We propose an experimentally feasible scheme for preparing a four-atom cluster state
in a thermal cavity. In the scheme, the cavity field is only virtually excited and
the photon-number-dependent part in the effective Hamiltonian is cancelled so that
the system is insensitive to the cavity decay and the thermal field. At the same
time, the scheme can be generalized to prepare n-atom cluster states with the
success probability 100\%. In addition, using the four-atom cluster state, we also
propose a simpler scheme for implementing a remote--controlled not gate (CNOT)
without the Bell states measurement. 相似文献
5.
Marcel Urban François Couchot Xavier Sarazin Arache Djannati-Atai 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2013,67(3):1-6
We present an economical scheme of five-party quantum state sharing (FQSTS) of an arbitrary m-atom with five-atom cluster state in cavity QED. It is found that the five-partite cluster state can be used for FQSTS of an arbitrary m-atom state. The implementation of this scheme does not involve Bell-basis or GHZ-basis measurements, which makes it more convenient in a practical application than some previous schemes. The scheme is also insensitive to the cavity decay and the thermal field. 相似文献
6.
This paper proposes a scheme for implementing the teleportation of an arbitrary unknown two-atom state by using a cluster state of four identical 2-level atoms as quantum channel in a thermal cavity. The two distinct advantages of the present scheme are: (i) The discrimination of 16 orthonormal cluster states in the standard teleportation protocol is transformed into the discrimination of single-atom states. Consequently, the discrimination difficulty of states is degraded. (ii) The scheme is insensitive to the cavity field state and the cavity decay for the thermal cavity is only virtually excited when atoms interact with it. Thus, the scheme is more feasible. 相似文献
7.
We propose a physical scheme for generating a two-atom cluster state through the simultaneous interaction of two two-level atoms with a single-mode cavity field prepared initially in an odd-coherent state under a large-detuned limit. The influence of the dissipation constant, the intensity of the field and the imperfect manipulation on the preparation scheme are investigated. It is shown that when the intensity of the cavity is large enough, the influence of the cavity decay is ettlciently suppressed. The possible error in the implementation of the cluster state is negligible when the time difference between two atoms crossing the cavity axis is small. It is suggested that the scheme can be realized by current technologies. 相似文献
8.
Peng-Fei Duan Wei-Long Duan Qiong-Si Fu Min Tang Pei-Hua Chen 《International Journal of Theoretical Physics》2014,53(12):4402-4406
We propose a scheme to prepare a two-qubit remote entangled state based on four-qubit cluster state in cavity quantum electrodynamics which involves the interaction of the atoms with the cavity. Through using four-particle cluster state as a quantum channel, we shown that the probability and fidelity of the successful remote state preparation can approach unit. In addition, our protocol only need single qubit measurement instead of the conventional Bell-state measurement, then it is quite simple but also very robust to the cavity decay and the influence of the thermal field. 相似文献
9.
We present a scheme for the generation of a five-atom cluster state in cavity QED. During the preparation no quantum information is transferred from the atoms to the cavity, and thus the scheme is insensitive to the cavity field states and cavity decay. 相似文献
10.
A scheme to generate multi-atom one-dimensional cluster state via one microwave cavity with an additional driven classical field is proposed. According to the scheme, one-dimensional cluster state with 2k-atom can be prepared in one step via one cavity, one-dimensional cluster state with (2k-1)-atom can be generated by measuring the2kth-atom of an 2k-atom cluster state in a certain basis. This scheme avoids cavity-field induced decay and may achieve one-dimensional cluster states with ideal success probability. 相似文献
11.
We propose one cavity QED (CQED) scheme for generating an arbitrary 2-level-atom cluster state. Besides, by using a 4-atom cluster state as quantum channel, we propose another CQED scheme for teleporting any unknown two-atom state. In both schemes, the dynamics processes are essentially quite similar. The Rabi frequency of the classical driving field is much bigger than the detuning between the atoms and the cavity. Hence both schemes are insensitive to the cavity decay. The necessary time for implementation is much shorter than the Rydberg-atom lifespan, therefore atom decays do not need to be considered. Moreover, in the teleportation scheme the discrimination of the 16 mutually orthogonal 4-atom cluster states is transformed into the discrimination of single-atom product states, consequently the discrimination difficulty is degraded and the scheme is more easily implemented. 相似文献
12.
We propose an experimentally feasible protocol for implementing controlled dense coding with a six-atom cluster state in cavity QED. In the scheme, we investigate that the atoms interact simultaneously with the highly detuned single-mode cavity and the strong classical driving field, and thus our scheme is not sensitive to both the cavity decay and the thermal field. In addition, the four-atom entangled states can be exactly distinguished by performing the single-atom measurements in cavity QED, therefore our scheme might be implemented in a simple way. 相似文献
13.
A realizable scheme is proposed for implementing quantum information splitting with five-atom cluster state in cavity QED,
where we explicitly illustrate the procedure. The scheme does not involve Bell-state measurement and is insensitive to the
cavity and the thermal field. 相似文献
14.
K. H. Song Y. J. Zhao Z. G. Shi S. H. Xiang X. W. Chen 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2012,66(1):1
In the system with superconducting quantum interference devices (SQUIDs) in a cavity, we propose a scheme for simultaneous
implementing n phase gates and one step preparing the highly entangled cluster states based on the two-channel Raman interaction. In our
scheme, the system is independent to the photon number of the cavity field, the cavity field can be initially in an arbitrary
state, which is convenient for the experimental operation. The n phase gates operation and the cluster state generation are realized by using only the two lower flux states of the SQUID
and the excited state would not be excited so that the influence of the decoherence due to spontaneous emission of the SQUID’s
levels is possible to minimize. More importantly, the operation time of the phase gates is independent of the number n of the qubits. Finally, the experimental feasibility is also discussed in detail. 相似文献
15.
Generation of cluster states in thermal cavity 总被引:1,自引:0,他引:1
A scheme is reported for generating a multi-atom cluster state in thermal cavities, which is based on the simultaneous interaction of two two-level atoms with a single-mode cavity field driven by a classical field. The photon-number-dependent parts in the evolution operator are cancelled with the assistant of a strong classical field, so the scheme is insensitive to the thermal field. In the present scheme, the detuning between the atoms and the cavity is equal to the atom-cavity coupling strength, thus the operation speed is greatly improved, which is important in view of decoherence. 相似文献
16.
Quantum State Sharing of an Arbitrary Two-Atom State by Using a?Six-Atom Cluster State in Cavity QED
Yi-You Nie Yuan-Hua Li Jun-Chang Liu Ming-Huang Sang 《International Journal of Theoretical Physics》2011,50(8):2526-2530
We demonstrate that a six-atom cluster state can be used to realize the deterministic quantum state sharing of an arbitrary
two-atom state in cavity QED. The scheme does not involve Bell-state measurement and is insensitive to both the cavity decay
and the thermal field. In our scheme, any one of the two agents is sufficient to reconstruct the original state under the
condition that he/she obtains the help of the other one, but only one of them cannot. 相似文献
17.
We propose a scheme for generating an N-atom cluster state via cavity quantum electrodynamics ( CQED). In our scheme, there is no transfer of quantum information between the atoms and the cavity, i.e., the cavity is always in the vacuum state, so the cavity decay can be suppressed. Also, the generated cluster state is the entanglement of the ground states, so the atomic spontaneous emission can be avoided. Therefore, the cluster state generated in our scheme has a longer lifetime. Furthermore, the requirement on the quality factor of the cavity greatly loosened for the cavity is only virtually excited. 相似文献
18.
Generation of field cluster states through collective operation of cavity QED disentanglement eraser
R. Ul-Islam A. H. Khosa H.-W. Lee F. Saif 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2008,48(2):271-277
We investigate effects of a collective disentanglement eraser performed over
states of two pairs of pre-entangled cavities tagged independently with two
identical three-level atoms. It is shown that the collective disentanglement
operation ensures not only the recovery of initial coherence but also its
extension from the initial two to four qubits, generating four-qubit field
cluster states. We also propose a cavity QED scheme to generate an arbitrary
field graph state by means of a collective operation of disentanglement erasers. 相似文献
19.
A scheme for transferring an unknown atomic entangledstate via cavity quantum electrodynamics 下载免费PDF全文
In this paper, we propose a scheme for transferring an unknown atomic entangled
state via cavity quantum electrodynamics (QED). This scheme, which has a successful
probability of 100 percent, does not require Bell-state measurement and performing
any operations to reconstruct an initial state. Meanwhile, the scheme only involves
atom--field interaction with a large detuning and does not require the transfer of
quantum information between the atoms and cavity. Thus the scheme is insensitive to
the cavity field states and cavity decay. This scheme can also be extended to
transfer ring an entangled state of $n$-atom. 相似文献
20.
Qing Shao 《International Journal of Theoretical Physics》2013,52(8):2573-2577
In this article, a scheme for quantum teleportation of a two-qubit entangled state using four-qubit cluster state is discussed by use of cavity quantum electrodynamics (QED) involving the interaction of the atoms with the cavity. In this protocol, by using a one-dimensional maximally four-qubit cluster state as quantum channel, quantum information of an unknown state of two two-level particles is faithfully transmitted from a sender (Alice) to a remote receiver (Bob). According to the results measured by the Bob, as it is shown, the unknown two-particle entangled state can be teleported perfectly, and the successful possibilities and fidelities of the scheme can reach 1.0. 相似文献