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1.
Quantum Generalized Measurement and Deterministic Generation of Maximum Entangled Pure State 总被引:2,自引:0,他引:2
ZHANG Ming DAI Hong-Yi HU De-Wen XIE Hong-Wei 《理论物理通讯》2006,46(5):833-837
We propose the concept of the quantum generalized projector measurement (QGPM) for finite-dimensional quantum systems by studying the quantum generalized measurement. This research reveals a distinguished property of this quantum generalized measurement: no matter what the system state is prior to the measurement and what the result of the measurement occurs, the state of the system after the measurement can be collapsed into any specified pure state, i.e., the state of quantum system can be deterministically reduced to any specified pure state just by a single QGPM. Subsequently. QGPM can be used to deterministically generate the maximum entangled pure state for quantum systems. We give three concrete theoretic schemes of generating the maximum quantum entangled pure states for two 2-Jevel particles, three 2-level particles and two 3-Jevel particles, respectively. 相似文献
2.
We propose the concept of the quantum generalized projector measurcment (QGPM) for finite-dimensional quantum systems by studying the quantum generalized measurement. This research reveals a distinguished property of this quantum generalized measurement: no matter what the system state is prior to the measurement and what the result of the measurement occurs, the state of the system after the measurement can be collapsed into any specified pure state, i.e., the state of quantum system can be deterministically reduced to any specified pure state just by a single QGPM. Subsequently, QGPM can be used to deterministically generate the maximum entangled pure state for quantum systems. We give three concrete theoretic schemes of generating the maximum quantum entangled pure stazes for two 2-level particles, three 2-level particles and two 3-level particles, respectively. 相似文献
3.
Song-Ya Ma Xiu-Bo Chen Xiao-Wei Guan Xin-Xin Niu Yi-Xian Yang 《International Journal of Theoretical Physics》2010,49(11):2704-2712
We propose a deterministic scheme to realize assisted-clone of an unknown N(≥3)-qubit entangled state. The first stage of the protocol requires teleportation via maximal entanglement as the quantum channel. In the second stage of the protocol, a novel set of mutually orthogonal basis vectors are constructed. With the assistance of the preparer through an N-particle projective measurement under this basis, the perfect copy of an original state can be produced. Comparing with the previous protocols which produce the unknown state and its orthogonal complement state at the site of the sender, our scheme generates the unknown state deterministically. 相似文献
4.
We propose a simple scheme for deterministic and multi-controlled teleportation of an arbitrary unknown two-level two-ion state in ion-trap system. In the scheme, the special entangled W states used as quantum channels and the requisite unitary transformations may be achieved via a single resonant interaction, respectively. The required time to complete the whole procedure does not increase with the number of agents. 相似文献
5.
Recently, a genuine six-qubit entangled state has been proposed by Tapiador et al. (J. Phys. A 42: 415301, 2009). In this paper, we present a deterministic scheme for generating such a state in cavity QED system, where the atoms interact simultaneously with the highly detuned single-mode cavity and the strong classical driving field. Thus our scheme is not sensitive to both the cavity decay and thermal field. 相似文献
6.
In this paper, we study the dynamics of a two-dimensional coupled cavity system under one-excitation condition. We show that the dynamics behaviors are strongly affected by the atom-cavity detuning (Δ) and cavity-cavity hopping υ. As a typical application, we apply this system to generate a four-atom W state. Notably, the entangled state generation is deterministic. As a basic research, the result will contribute to the understanding of more complex systems. 相似文献
7.
We propose a new scheme for realizing deterministic quantum state transfer (QST) between two spatially separated single molecule magnets (SMMs) with the framework of cavity quantum eleetrodynamics (QED). In the present scheme, two SMMs are trapped in two spatially separated optical cavities coupled by an optical fiber. Through strictly numerically simulating, we demonstrate that our scheme is robust with respect to the SMMs' spontaneous decay and fiber loss under the conditions of dispersive SMMs-field interaction and strong coupling of cavity fiber. In addition, we also discuss the influence of photon leakage out of cavities and show that our proposal is good enough to demonstrate the generation of QST with high fidelity utilizing the current experimental technology. The present investigation provides research opportunities for realizing QST between solid-state qubits and may result in a substantial impact on the progress of solid-state-based quantum communications network. 相似文献
8.
We propose a new scheme for realizing deterministic quantum statetransfer (QST) between two spatially separated single moleculemagnets (SMMs) with the framework of cavity quantum electrodynamics(QED). In the present scheme, two SMMs are trapped in two spatiallyseparated optical cavities coupled by an optical fiber. Through strictly numerically simulating, we demonstrate that our scheme is robust with respect to the SMMs' spontaneous decay and fiber loss under the conditions of dispersive SMMs-field interaction and strong coupling of cavity fiber. In addition, we also discuss the influence of photon leakage out of cavities and show that our proposal is good enough to demonstrate the generation of QST with high fidelity utilizing the current experimental technology. Thepresent investigation provides research opportunities for realizingQST between solid-state qubits and may result in a substantial impact on the progress of solid-state-based quantum communications network. 相似文献
9.
Probabilistic Teleportation of an Unknown Two-Particle State with a Four-Particle Pure Entangled State and Positive Operator Valued Measure 总被引:8,自引:0,他引:8
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We propose a scheme for probabilistic teleportation of an unknown two-particle state with a four-particle pure entangled state and positive operator valued measure (POVM). In this scheme the teleportation of an unknown two-particle state can be realized with certain probability by performing two Bell state measurements, a proper POVM and a unitary transformation. 相似文献
10.
11.
You-Bang Zhan 《International Journal of Theoretical Physics》2012,51(6):1655-1662
We present two schemes for perfect cloning unknown two-qubit and general two-qubit entangled states with assistance from two
state preparers, respectively. In the schemes, the sender wish to teleport an unknown two-qubit (or general two-qubit) entangled
state which from two state preparers to a remote receiver, and then create a perfect copy of the unknown state at her place.
The schemes include two stages. The first stage of the schemes requires usual teleportation. In the second stage, to help
the sender realize the quantum cloning, two state preparers perform two-qubit projective measurements on their own qubits
which from the sender, then the sender can acquire a perfect copy of the unknown state. To complete the assisted cloning schemes,
several novel sets of mutually orthogonal basis vectors are introduced. It is shown that, only if two state preparers collaborate
with each other, and perform projective measurements under suitable measuring basis on their own qubit respectively, the sender
can create a copy of the unknown state by means of some appropriate unitary operations. The advantage of the present schemes
is that the total success probability for assisted cloning a perfect copy of the unknown state can reach 1. 相似文献
12.
13.
We propose a controlled scheme for teleportation of an arbitrary one
or two atomic state via a driven QED cavity. The scheme does not
involve the joint Bell-state-measurement BSM and the probability
of successful teleportation is 1. We show that the original atomic
state cannot be perfectly restored by the receiver without all the
agents collaborate and classical communication. 相似文献
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15.
We demonstrate that a seven-qubit entangled state can be used to realize the deterministic tripartite controlled remote state preparation by performing only Pauli operations and single-qubit measurements. In our scheme, three distant senders can simultaneously and deterministically exchange their quantum state with the other senders under the control of the supervisor. 相似文献
16.
In this paper, we demonstrate how a five-qubit entangled state can be used to realize the deterministic Quantum State Sharing (QSTS) of a single and two-qubit state among three parties by performing von-Neumann measurement and bell-state measurements. In our scheme, any of the two agents has the ability to reconstruct the original state if he/she collaborates with the other agent,otherwise an individual agent does not have enough information to reconstruct the original state. The paper also outlines the various measurements and mathematical framework of the scheme. The security analysis of our scheme against two attacks scenarios prove that the scheme is secure against an eavesdropper attack and a malicious attacks. 相似文献
17.
Yuan-hua Li Xiao-lan Li Ming-huang Sang Yi-you Nie 《International Journal of Theoretical Physics》2014,53(1):111-115
We present a tripartite quantum information splitting (QIS) protocol for splitting an arbitrary two-qubit state by using a five-qubit entangled state as quantum channel. We describe the construction of this channel and explicitly demonstrate how the QIS protocol works. We illustrate the procedure in the ion-trap systems, but the protocol can also be realized in other systems. 相似文献
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19.
We present the generation of six-particle Greenberger Horne-Zeilinger (GHZ) states via deterministic entanglement concentration and generalize the scheme to the case of 2N particles. We show that arbitrary 2N-particle GHZ states can be obtained with certain probability via entanglement concentration. This may provide a new perspective for the preparation of multi-particle GHZ states. This study is also an exploration on the theory of deterministic entanglement concentration. 相似文献
20.
Recently, deterministic joint remote state preparation (JRSP) schemes have been proposed to achieve 100% success probability. In this paper, we propose a new version of deterministic JRSP scheme of an arbitrary two-qubit state by using the six-qubit cluster state as shared quantum resource. Compared with previous schemes, our scheme has high efficiency since less quantum resource is required, some additional unitary operations and measurements are unnecessary. We point out that the existing two types of deterministic JRSP schemes based on GHZ states and EPR pairs are equivalent. 相似文献