共查询到20条相似文献,搜索用时 31 毫秒
1.
YANG Wen-Xing 《理论物理通讯》2006,46(2):297-302
We propose a scheme to generate a superposition of motional coherent states with arbitrary coefficients on a line in phase space and implement a quantum controlled phase-gate for multiple trapped ions with a single standing-wave laser pulse whose carrier frequency is tuned to the ions transition. In the scheme each ion does not need to be exactly positioned at the node of the standing wave, which is very important from viewpoint of experiment, Furthermore, our scheme may allow the generation of a superposition of coherent states with large mean phonon number for a large number of trapped ions in a fast way by choosing suitable laser intensity. We show that it can also be used to generate maximally entangled states of multiple trapped ions. 相似文献
2.
ZHENG Shi-Biao 《理论物理通讯》2005,43(3):523-525
We propose a scheme to generate entangled coherent states for the
vibrational modes of N trapped ions. In the scheme the first ion is
sequentially excited by two travelling wave laser fields tuned to the ion
transition. The scheme works in the strong-excitation regime, which is of
experimental importance in view of decoherence. 相似文献
3.
Preparation of nonclassical states and measurement of the Wigner function for the collective motion of N trapped ions 下载免费PDF全文
We propose a scheme for generating nonclassical states for the centre-of-mass vibrational mode of N trapped ions,including superpositions of several coherent states on a circle and Fock states. In the scheme N trapped ions are driven by a laser beam tuned to the carrier. The scheme also provides a new prospect for laser cooling. The scheme can be used to measure the Wigner function of the collective vibrational mode. 相似文献
4.
YANG Wen-Xing LI Jia-Hua ZHNG An-Shou 《理论物理通讯》2007,47(3):421-426
We propose two schemes to prepare entanglement for the vibronic collective states of multiple trapped ions. The first scheme aims to generating multipartite entanglement for vibrational modes of trapped ions, which only requires a single laser beam tuned to the ionic carrier frequency. Our scheme works in the mediated excitation regime, in which the corresponding Rabi frequency is equal to the trap frequency. Beyond their fundamental importance, these states may be of interest for experimental studies on decoherence since the present scheme operates in a fast way. The second scheme aims to preparing the continuous variable multimode maximal1y Greenberger-Horne-Zeilinger state. The distinct advantage is that the operation time is only limited by the available laser intensity, not by the inherent mechanisms such as off-resonant excitations. This makes it promising to obtain entanglernent of multiple coherent and squeezing states with desired amplitudes in a reasonable time. 相似文献
5.
Fast scheme for generating quantum-interference states and GHZ state of N trapped ions 总被引:1,自引:0,他引:1 下载免费PDF全文
We propose a fast scheme to generate the quantum-interference states
of N trapped ions. In the scheme the ions are driven by a
standing-wave laser beam whose carrier frequency is tuned such that
the ion transition can take place. We also propose a simple and fast
scheme to produce the GHZ state of N hot trapped ions and this
scheme is insensitive to the heating of vibrational motion, which is
important from the viewpoint of decoherence. 相似文献
6.
We propose a scheme for the generation of entangled coherent states for the center-of-mass and relative vibrational modes of two trapped ions. In the scheme the ions are simultaneously illuminated by a single standing-wave laser tuned to the carrier. The scheme allows the production of an entangled coherent states with a considerably high speed as long as a laser field of sufficiently high intensity is available. 相似文献
7.
LIN Li-Hua JIANG Yun-Kun YANG Zhen-Biao YE Sai-Yun 《理论物理通讯》2005,44(4):712-714
We propose a scheme for the generation of entangled coherent states for the center-of-mass and relative vibrational modes of two trapped ions. In the scheme the ions are simultaneously illuminated by a single standing-wave laser tuned to the carrier. The scheme allows the production of an entangled coherent states with a considerably high speed as long as a laser field of sufficiently high intensity is available. 相似文献
8.
A scheme is proposed to generate arbitrary, discrete
superpostions of squeezed coherent states of the squeezed center of mass of
$N$ trapped ions along a straight line in phase space.
The scheme is based on a
resonant bichromatic excitation of each trapped ion that generates
displacement and squeezing in the vibrational motion conditioned to each
internal state. In this paper, we also show that such a method can be
used for the engineering of motional quantum states. 相似文献
9.
Efficient Scheme for Greenberger-Horne-Zeilinger State and Cluster State with Trapped Ions 下载免费PDF全文
We propose a scheme to generate the Greenberger-Horne-Zeilinger (GHZ) states and the cluster states of many trapped ions. In the scheme, the ion is illuminated by a single laser tuned to the first lower vibrational sideband. The scheme only requires resonant interactions. Thus the scheme is very simple and the quantum dynamics operation can be realized at a high speed, which is important in view of decoherence. 相似文献
10.
11.
Shi-Biao Zheng 《Czechoslovak Journal of Physics》2002,52(5):713-718
We propose a method for the generation of motional pair coherent states for the center of mass and relative motional modes
for two trapped ions. The scheme is generalized to prepare pair cat states. The scheme does not require individual ionic laser
addressing. 相似文献
12.
ZHENG Shi-Biao 《理论物理通讯》2005,44(12)
We propose a method for the generation of superpositions of two-mode coherent states for the center-of-mass and relative vibrational modes of two trapped ions. In the scheme the ions are driven by a single travelling-wave laser field tuned to the carrier. Then a measurement of the internal states collapses the vibrational modes to the entangled coherent state. 相似文献
13.
ZHENG Shi-Biao 《理论物理通讯》2005,44(6):1071-1072
We propose a method for the generation of superpositions of two-mode coherent states for the center-of-mass and relative vibrational modes of two trapped ions. In the scheme the ions are driven by a single travelling-wave laser field tuned to the carrier. Then a measurement of the internal states collapses the vibrational modes to the entangled coherent state. 相似文献
14.
In this paper, a procedure is proposed for measuring Wigner characteristic function for motion of a single trapped ion. In the scheme, the trapped ion is driven by two laser beams with different frequencies tuned to the first lower and upper vibrational sidebands, respectively. Unlike other previous scheme, our scheme does not require the displacement of the external state before the ion-laser interaction and thus our scheme might be more simple and feasible. The scheme can also be used to prepare the motional Schr(o)dinger cat states and entangled coherent states. 相似文献
15.
ZHANG Su-Zhen XIE Xiao-Tao YANG Wen-Xin 《理论物理通讯》2006,46(2):306-308
In this paper, a procedure is proposed for measuring Wigner characteristic function for motion of a single trapped ion. In the scheme, the trapped ion is driven by two laser beams with different frequencies tuned to the first lower and upper vibrational sidebands, respectively. Unlike other previous scheme, our scheme does not require the displacement of the external state before the ion-laser interaction and thus our scheme night be more simple and feasible. The scheme can also be used to prepare the motional Schroedinger cat states and entangled coherent states. 相似文献
16.
Measurement of the decoherence of a mesoscopic superposition of motional states of a trapped ion 下载免费PDF全文
We propose a scheme to observe the decoherence of a mesoscopic superposition of two coherent states in the motion of a trapped ion. In the scheme the ion is excited by two perpendicular lasers tuned to the ion transition. The decoherence is revealed by the decrease of the correlation between two successive measurements of the internal state of the ion after relevant laser-ion interaction. 相似文献
17.
We propose a scheme for telecloning quantum states with trapped ions. The scheme is based on a single ion interacting with a single laser pulse. In the protocol, an ion is firstly measured to determine whether the telecloning succeeds or not, and then another ion is detected to complete the whole procedure. The required experimental techniques are within the scope of what can be obtained in the ion-trap setup. 相似文献
18.
YANG Rong-Can LI Hong-Cai LIN Xiu HUANG Zhi-Ping 《理论物理通讯》2007,48(5):827-830
We propose a scheme for telecloning quantum states with trapped ions. The scheme is based on a single ion interacting with a single laser pulse. In the protocol, an ion is firstly measured to determine whether the telecloning succeeds or not, and then another ion is detected to complete the whole procedure. The required experimental techniques are within the scope of what can be obtained in the ion-trap setup. 相似文献
19.
We describe a scheme for the generation of macroscopic quantum-interference states for a collection of trapped ions by a single geometric phase operation. In the scheme the vibrational mode is displaced along a circle with the radius proportional to the number of ions in a certain ground electronic state. For a given interaction time, the vibrational mode returns to the original state, and the ionic system acquires a geometric phase proportional to the area of the circle, evolving from a coherent state to a superposition of two coherent states. The ions undergo no electronic transitions during the operation. Taking advantage of the inherent fault-tolerant feature of the geometric operation, our scheme is robust against decoherence. 相似文献
20.
Quantum Signatures of Chaos in Adiabatic Interaction Between a Trapped Ion and a Laser Standing Wave
LI Hui HAI Wen-Hua XU Jun 《理论物理通讯》2008,49(1):143-152
We study quantum motion around a classical heteroclinic point of a single trapped ion interacting with a strong laser standing wave. We construct a set of exact coherent states of the quantum system and from the exact solutions reveal that quantum signatures of chaos can be induced by the adiabatic interaction between the trapped ion and the laser standing wave, where the quantum expectation values of position and momentum correspond to the classically chaotic orbit. The chaotic region on the phase space is illustrated. The energy crossing and quantum resonance in time evolution and the exponentially increased Heisenberg uncertainty are found. The results suggest a theoretical scheme for controlling the unstable regular and chaotic motions. 相似文献