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1.
Quantum state sharing of an arbitrary qudit state by using nonmaximally generalized GHZ state
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We present a scheme for quantum state sharing of an arbitrary qudit state by using nonmaximally entangled generalized Greenberger-Horne-Zeilinger (GHZ) states as the quantum channel and generalized Bell-basis states as the joint measurement basis. We show that the probability of successful sharing an unknown qudit state depends on the joint measurements chosen by Alice. We also give an expression for the maximally probability of this scheme. 相似文献
2.
Remote interactions between two d-dimensional distributed quantum systems: nonlocal generalized quantum control-NOT gate and entanglement swapping
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We present a systematic simple method to implement a generalized quantum control-NOT (CNOT) gate on two d-dimensional distributed systems. First, we show how the nonlocal generalized quantum CNOT gate can be implemented with unity fidelity and unity probability by using a maximally entangled pair of qudits as a quantum channel. We also put forward a scheme for probabilistically implementing the nonlocal operation with unity fidelity by employing a partially entangled qudit pair as a quantum channel. Analysis of the scheme indicates that the use of partially entangled quantum channel for implementing the nonlocal generalized quantum CNOT gate leads to the problem of 'the general optimal information extraction'. We also point out that the nonlocal generalized quantum CNOT gate can be used in the entanglement swapping between particles belonging to distant users in a communication network and distributed quantum computer.[第一段] 相似文献
3.
基于一种特殊的控制非门,实现多光子偏振态与单光子空间高维态之间的相互变换,使得对多光子偏振态的操作可以通过对单光子的操作来完成,由此可以实现任意多光子正定算符值测量和多光子任意幺正操作.这种实现方式是以一定概率完成的,但其效率要优于此前的方案,在目前的实验条件下是可行的.
关键词:
单光子空间态
特殊控制非门
线性光学多端口干涉仪 相似文献
4.
Two different schemes are presented for quantum teleportation of an arbitrary two-qudit state using a non-maximally four-qudit
cluster state as the quantum channel. The first scheme is based on the Bell-basis measurements and the receiver may probabilistically
reconstruct the original state by performing proper transformation on her particles and an auxiliary two-level particle; the
second scheme is based on the generalized Bell-basis measurements and the probability of successfully teleporting the unknown
state depends on those measurements which are adjusted by Alice. A comparison of the two schemes shows that the latter has
a smaller probability than that of the former and contrary to the former, the channel information and auxiliary qubit are
not necessary for the receiver in the latter.
Supported by the Natural Science Research Project of Shanxi Province (Grant No. 2004A15) 相似文献
5.
We propose a scheme for realizing a controlled teleportation of random
$M$-qudit quantum information under the control of $N$ agents. The resource
consumption includes a prearranged $(2M + N + 1)$-qudit entangled quantum
channel and $(2M + N + 1)\log _2 d$-bit classical communication. And the
quantum operations used in the teleportation process are a series of
generalized Bell-state measurements, single-qudit measurements, qudit
$H$-gates, qudit-Pauli gates and qudit phase gates. It is shown that the
original state can be restored by the receiver only on condition that
all the agents work in collaboration with each others.
If one agent does not cooperate with the other, the original
state cannot be fully recovered. 相似文献
6.
7.
Quantum circuit model has been widely explored for various quantum applications such as Shors algorithm and Grovers searching algorithm. Most of previous algorithms are based on the qubit systems. Herein a proposal for a universal circuit is given based on the qudit system, which is larger and can store more information. In order to prove its universality for quantum applications, an explicit set of one-qudit and two-qudit gates is provided for the universal qudit computation. The one-qudit gates are general rotation for each two-dimensional subspace while the two-qudit gates are their controlled extensions. In comparison to previous quantum qudit logical gates, each primitive qudit gate is only dependent on two free parameters and may be easily implemented. In experimental implementation, multilevel ions with the linear ion trap model are used to build the qudit systems and use the coupling of neighbored levels for qudit gates. The controlled qudit gates may be realized with the interactions of internal and external coordinates of the ion. 相似文献
8.
Spin tomographic symbols of qudit states and spin observables are studied. Spin observables are associated with the functions
on a manifold whose points are labeled by the spin projections and sphere S
2 coordinates. The star-product kernel for such functions is obtained in an explicit form and connected with the Fourier transform
of characters of the SU(2) irreducible representation. The kernels are shown to be in close relation to the Chebyshev polynomials. Using specific
properties of these polynomials, we establish the recurrence relation between the kernels for different spins. Employing the
explicit form of the star-product kernel, a sum rule for Clebsch–Gordan and Racah coefficients is derived. Explicit formulas
are obtained for the dual tomographic star-product kernel as well as for intertwining kernels which relate spin tomographic
symbols and dual tomographic symbols. 相似文献
9.
We propose a scheme for realizing a controlled teleportation of random M-qudit quantum information under the control of N agents. The resource consumption includes a prearranged (2M + N + 1)-qudit entangled quantum channel and (2M + N +1) log2 d-bit classical communication. And the quantum operations used in the teleportation process are a series of generalized Bell-state measurements, single-qudit measurements, qudit H-gates, qudit-Pauli gates and qudit phase gates. It is shown that the original state can be restored by the receiver only on condition that all the agents work in collaboration with each others. If one agent does not cooperate with the other, the original state cannot be fully recovered. 相似文献
10.
M. Mirzaee M. Rezaee M. A. Jafarizadeh 《International Journal of Theoretical Physics》2007,46(6):1471-1494
Using the convex semidefinite programming method and superoperator formalism we obtain the finite quantum tomography of some
mixed quantum states such as: truncated coherent states tomography, phase tomography and coherent spin state tomography, qudit
tomography, N-qubit tomography, where that obtained results are in agreement with those of References (Buzek et al., Chaos, Solitons and Fractals
10 (1999) 981; Schack and Caves, Separable states of N quantum bits. In: Proceedings of the X. International Symposium on Theoretical Electrical Engineering, 73. W. Mathis and T. Schindler, eds. Otto-von-Guericke University of Magdeburg, Germany (1999); Pegg and Barnett Physical Review A
39 (1989) 1665; Barnett and Pegg Journal of Modern Optics
36 (1989) 7; St. Weigert Acta Physica Slov.
4 (1999) 613).
PACs index: 03.65.Ud 相似文献