共查询到20条相似文献,搜索用时 218 毫秒
1.
A scheme is proposed to generate an N-qubit cluster-type entangled squeezed vacuum state (CTESVS) based on the two-photon interaction between a two-level atomand the cavity fields with the cavity QED system. The CTESVS in N separate cavities can be effectively obtained after performing a simple one-qubit measurement on the atom. The influence of cavity decay on the CTESVS is also discussed. 相似文献
2.
ZHENGShi-Biao 《理论物理通讯》2002,38(6):663-666
A scheme is suggested for the generation of multi-atom maximally entangled states with a cavity in a thermal state,In this scheme several appropriately prepared two-level atoms are simultaneously sent through the nonresonant cavity.We divide the whole atom-cavity interaction time into two equal parts.At the end of the first part a π pulse is applied to the atome using a classical field.Then the photon-number-dependent shifts on the atomic states are cancelled and the atomic system finally evoloves to a maximally entangled state. 相似文献
3.
This paper proposes an efficient scheme for deterministic generation
of entangled coherent states for two atomic samples. In the scheme
two collections of atoms are trapped in an optical cavity and driven
by a classical field. Under certain conditions the two atomic
samples evolve from an coherent state to an entangled coherent
state. During the interaction the cavity mode is always in the
vacuum state and the atoms have no probability of being populated in
the excited state. Thus, the scheme is insensitive to both the
cavity decay and atomic spontaneous emission. 相似文献
4.
ZHENG ShiBiao 《理论物理通讯》2000,33(3):507-509
We propose a scheme for the generation of superpositions of collective atomic coherent states. In the scheme a collection of degenerate A-type three-level atoms is confined in a high-Q cavity and interacts with the cavity field in a Raman manner. Then a state reduction on the field collapses the atomic system onto a superposition state. 相似文献
5.
6.
ZHANG Li-Hua CAO Zhuo-Liang 《理论物理通讯》2008,49(3):595-598
We present a scheme for generation of two-atomic entangled state by using the interference of polarized photons. The scheme does not require complete mapping between the atomic state and the photonic state, nor does it require the establishment of maximal entanglement between the atom and the cavity. And the atom-cavity coupling strength is smaller than the cavity decay rate. This greatly relaxes the requirement on the cavity quality. The scheme is for non-post-selection results and all the steps of the scheme are within the current technologies. 相似文献
7.
ZHENGShi-Biao 《理论物理通讯》2002,37(1):87-90
A method is presented for generating highly squeezed states of a cavity field via the atom-cavity field interaction of the Raman type.In the scheme a sequence of three-level Λ-type atoms interacts with a cavity field,displaced by a classical source,in a Raman manner.Then the atomic states are measured.By this way the cavity field may collapse onto a superposition of several coherent states,which exhibits strong squeezing.The scheme can also be used to prepare superpositions of many two-mode coherent states for two cavity fields.The coherent states in each mode are on a straight line.This is the first way for preparing multi-component entangled coherent states of this type in cavity QED. 相似文献
8.
This paper proposes a scheme for teleporting a two-atom entangled
state using leaky cavities. It uses resonant atom--cavity interaction
to map the atomic state onto the cavity field. Then it utilizes the
interference of polarized photons to establish the correlation
between the distant sender and receiver. The advantage of the scheme
is that the fidelity is independent of the cavity decay rate, atomic
decay and detection efficiency. 相似文献
9.
ZHENG Shi-Biao 《理论物理通讯》2002,38(12)
A scheme is suggested for the generation of multi-atom maximally entangled states with a cavity in a thermalstate. In this scheme several appropriately prepared two-level atoms are simultaneously sent through the nonresonantcavity. We divide the whole atom-cavity interaction time into two equal parts. At the end of the first part a π pulse isapplied to the atoms using a classical field. Then the photon-number-dependent shifts on the atomic states are cancelledand the atomic system finally evolves to a maximally entangled state. 相似文献
10.
This paper proposes a scheme for information concentration of two remote two-level
atoms in cavity QED. This scheme does not involve the Bell-state measurement. During
the interaction between atom and cavity, the cavity frequency is large-detuned from
the atomic transition frequency, thus the scheme is insensitive to both the cavity
decay and the thermal field. This idea can directly be generalized in the case of
multi-atom information concentration. 相似文献
11.
WANG Xin-Wen LIU Xiang FANG Mao-Fa 《理论物理通讯》2007,47(6):1033-1036
We propose a scheme for teleportation of four-level atomic states in thermal cavities. The scheme does not involve the generalized Bell-state or generalized GHZ-state measurement, which is difficult in practice. Another feature of the scheme is that it does not require individual addressing of atoms in cavity and is insensitive to both cavity decay and thermal field, which is of importance in point of experiment. 相似文献
12.
A scheme is proposed for the teleportation of an unknown atomic state. The scheme is based on the resonant interaction of atoms with a coherent cavity field. The mean photon-number of the cavity field is much smaller than one and thus the cavity decay can be effectively suppressed. Another advantage of the scheme is that only one cavity is required. 相似文献
13.
In this paper, we propose a physical scheme to concentrate non-maximally entangled
atomic pure states by using atomic collision in a far-off-resonant cavity. The most
distinctive advantage of our scheme is that the non-maximally entangled atoms may be
far from or near each other and their degree of entanglement can be maximally
amplified. The photon-number-dependent parts in the effective Hamiltonian are
cancelled with the assistance of a strong classical field, thus the scheme is
insensitive to both the cavity decay and the thermal field. 相似文献
14.
We propose a scheme to generate atomic cluster states of arbitrary
configuration in the cavity quantum electrodynamics (QED) system. The
process is achieved via adiabatic evolution of dark states, which only
requires adiabatically increasing or decreasing Rabi frequencies of laser.
Thus it allows the robust implementation of entanglement against certain types of errors. Our scheme is relatively decoherence-free in the sense that excited atomic states are never populated and excited cavity photon states can be made negligible in certain conditions. 相似文献
15.
We propose an efficient scheme for realizing two-mode squeezing for two cavity modes with an atomic ensemble trapped in the cavity and driven by two classical fields. Through a suitable choice of the driving classical fields, the evolution dynamics of the two cavity modes is decoupled with the atomic system and described by a two-mode squeezing operator. We show that a highly squeezed state can be obtained at the output even with a bad cavity. The required experimental techniques are within the scope of what can be obtained in the BEG-cavity setup. 相似文献
16.
A Feasible Scheme for Teleportation of Multi-atom Cat-like States in Thermal Cavities 总被引:4,自引:0,他引:4
An experimentally feasible scheme for implementing teleportation of multi-atom cat-like states in cavity QED is proposed. In the scheme the atoms interact simultaneously with a highly detuned cavity mode and are driven by a strong classical field, and the atomic state evolution is independent of cavity field state. Thus the scheme is insensitive to both the cavity decay and the thermal field, which is of importance from the experimental point of view. All the orthogonal and complete multi-atom GHZ states can be exactly distinguished only by one step, so our scheme can also be used for other purposes such as dense coding using multi-atom GHZ states as quantum channels. 相似文献
17.
We propose a scheme for generating maximally GHZ state for four atoms trapped in a two-mode optical cavity via combination of cavity QED and linear optics system. The GHZ state can be not only generated deterministically with a single resonant interaction in cavity QED, but also can be prepared probabilistically based on cavity QED and linear optics elements. The fidelity of the entangled states is not affected by the atomic spontaneous, cavity decay, and imperfection of the photon-detectors. Finally, we briefly analyze and discuss the experimental feasibility of the proposed scheme. 相似文献
18.
An efficient scheme is proposed for the generation of atomic Schrodinger cat states in an optical cavity. Inthe scheme N three-level atoms are loaded in the optical cavity. Raman coupling of two ground states is achieved via alaser field and the cavity mode. The cavity mode is always in the vacuum state and the atoms have no probability ofbeing populated in the excited state. Thus, the scheme is insensitive to both the cavity decay and spontaneous emission. 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.
卢道明 《原子与分子物理学报》2012,29(6)
利用两个二能级原子和用光纤联接的两个单模光腔构成的系统,给出了实现量子态转移的方案。该方案中两个二能级原子分别处于用光纤联接的单模腔中,并同时与光场发生共振相互作用。通过控制原子与光场的相互作用时间,实现量子态的转移。 相似文献