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1.
P. K. Aravind 《Foundations of Physics Letters》2002,15(4):397-405
A proof of Bell's theorem without inequalities and involving only two observers is given by suitably extending a proof of the Bell-Kochen-Specker theorem due to Mermin. This proof is generalized to obtain an inequality-free proof of Bell's theorem for a set of n Bell states (with n odd) shared between two distant observers. A generalized CHSH inequality is formulated for n Bell states shared symmetrically between two observers and it is shown that quantum mechanics violates this inequality by an amount that grows exponentially with increasing n. 相似文献
2.
A generalized proof of Bell's theorem without inequalities via the singlet state of two spin-(2n + 1)/2 fermionic particles for two observers is proposed. It is a direct and
meaningful extension of that presented by A. Cabello [Phys. Rev. A67
(2003) 032107] and the proof from A. Cabello is included in our proof as a special
example. 相似文献
3.
Gregory S. Duane 《Foundations of Physics Letters》2001,14(4):341-353
Motivated by a parallel between quantum cryptography and chaos synchronization cryptography, we construct a Bell's inequality for a pair of synchronously coupled variable-order Generalized Rossler Systems, with arbitrarily binarized final states. In the infinite-order limit, although dynamical parameters cannot be extracted from the coupling signal in finite time, the inequality is violated, as with entangled quantum states. The violations are weaker than in quantum theory, vanishing as the differences between corresponding parameters of the coupled systems become small. The fact that Bell's inequality can be violated for a pair of classical systems that are not discernibly connected supports the possibility of a realist interpretation of quantum mechanics. 相似文献
4.
ZHENG Shi-Biao 《理论物理通讯》2001,(11)
A simplified scheme is proposed for the test of quantum nonlocality of the type described by Hardy [Phys.Rev.Left.71 (1993) 1665].In the scheme two appropriately prepared atoms are simultaneously sent through a cavity and dispersively interact with the cavity field.Then state-selective measurements are performed on these atoms,which may reveal quantum nonlocality without using Bell inequality.We also propose a simple scheme for the generation of multi-atom entangled states.`` 相似文献
5.
ZHENG Shi-Biao 《理论物理通讯》2001,36(5):547-549
A simplified scheme is proposed for the test of quantum nonlocality of the type described by Hardy [Phys.Rev.Left.71 (1993) 1665] .In the scheme two appropriately prepared atoms are simultaneously sent through a cavity and dispersively interact with the cavity field.Then state-selective measurements are performed on these atoms,which may reveal quantum nonlocality without using Bell inequality.We also propose a simple scheme for the generation of multi-atom entangled states. 相似文献
6.
7.
Travis Norsen 《Foundations of Physics Letters》2006,19(7):633-655
It is demonstrated that hidden variables of a certain type follow logically from a certain local causality requirement (“Bell
Locality”) and the empirically well-supported predictions of quantum theory for the standard EPR-Bell set up. The demonstrated
hidden variables are precisely those needed for the derivation of the Bell Inequalities. We thus refute the widespread view
that empirical violations of Bell Inequalities leave open a choice of whether to reject (i) locality or (ii) hidden
variables. Both principles are indeed assumed in the derivation of the
inequalities, but since, as we demonstrate here, (ii) actually follows from (i), there is no choice but to blame the violation
of Bell's Inequality on (i). Our main conclusion is thus no Bell Local theory can be consistent with what is known from experiment
about the correlations exhibited by separated particles. Aside from our conclusion being based on a different sense of locality
this conclusion resembles one that has been advocated recently by H.P. Stapp. We therefore also carefully contrast the argument
presented here to that proposed by Stapp. 相似文献
8.
José L. Cereceda 《Foundations of Physics Letters》1999,12(3):211-231
In this paper the failure of Hardy's nonlocality proof for the class of maximally entangled states is considered. A detailed analysis shows that the incompatibility of the Hardy equations for this class of states physically originates from the fact that the existence of quantum perfect correlations for the three pairs of two-valued observables (D
11, D
21), (D
11, D
22), and (D
12, D
21) [in the sense of having with certainty equal (different) readings for a joint measurement of any one of the pairs (D
11, D
21), (D
11, D
22), and (D
12, D
21)], necessarily entails perfect correlation for the pair of observables (D
12, D
22) [in the sense of having with certainty equal (different) readings for a joint measurement of the pair (D
12, D
22)]. Indeed, the set of these four perfect correlations is found to satisfy the CHSH inequality, and then no violations of local realism will arise for the maximally entangled state as far as the four observables D
ij, i,j = 1 or 2, are concerned. The connection between this fact and the impossibility for the quantum mechanical predictions to give the maximum possible theoretical violation of the CHSH inequality is pointed out. Moreover, it is generally proved that the fulfillment of all the Hardy nonlocality conditions necessarily entails a violation of the resulting CHSH inequality. The largest violation of this latter inequality is determined. 相似文献
9.
Shahpoor Moradi 《理论物理通讯》2009,52(1):30-32
For two particles with different spins, we derive the Bell's inequality. The inequality is investigated for two systems combining spin-1 and spin-1/2; spin-1/2 and spin-3/2. We show that for these states Bell's inequality is violated. 相似文献
10.
The theorem of Bell states that certain results of quantum mechanics violate inequalities that are valid for objective local
random variables. We show that the inequalities of Bell are special cases of theorems found 10 years earlier by Bass and stated
in full generality by Vorob’ev. This fact implies precise necessary and sufficient mathematical conditions for the validity
of the Bell inequalities. We show that these precise conditions differ significantly from the definition of objective local
variable spaces and as an application that the Bell inequalities may be violated even for objective local random variables. 相似文献
11.
YAN Li-Hua GAO Yun-Feng 《理论物理通讯》2009,51(2):235-238
Abstract A simple scheme for teleporting an unknown M-qubit cat-like state is proposed. The steps of this scheme can be summarized simply: disentangle-teleport-reconstruct entanglement. If proper unitary operations and measurements from senders are given, the teleportation of an unknown M-qubit cat-like state can be converted into single qubit teleportation. In the meantime, the receiver should also carry out right unitary operations with the introduction of appropriate ancillary qubits to confirm the successful teleportation of the demanded entangled state. The present scheme can be generalized to teleport an unknown M-quNit state, i.e., an M-quNit state can be teleported by a single quNit entangled pair. 相似文献
12.
Scheme for Teleportation of a Multipartite Quantum State by Using a Single Entangled Pair as Quantum Channel 总被引:2,自引:0,他引:2
We present a theoretical scheme for perfect teleportation of an unknown multipartite two-level state by a single EPR (Einstein-Podolsky-Rosen) pair,and then generalize it to multilevel,i.e.,an N-quNit state can be teleported by a single quNit entangled pair,with additional local unitary operations.The feature of the scheme is that teleporting a multipartite state with a reduced amount of entanglement costs less classical bits. 相似文献
13.
WU Dao-Hua DONG Ping YANG Ming CAO Zhuo-Liang 《理论物理通讯》2008,49(4):877-880
We propose a scheme for controlled entanglement swapping of continuous variable, where an EPR pair shared by two parties (Alice and Debbie) and a GHZ entangled state shared by three parties (Alice, Bob and Claire) are required. One optical beams of the EPR state will be entangled with the output mode displaced by Bob with the help of Claire. It is shown that the entanglement swapping can occur controlled by the third party (Claire) 相似文献
14.
Sylvia Pulmannová 《Foundations of Physics》2002,32(2):193-216
In the quantum logic approach, Bell inequalities in the sense of Pitowski are related with quasi hidden variables in the sense of Deliyannis. Some properties of hidden variables on effect algebras are discussed. 相似文献
15.
16.
17.
Probabilistic teleportation of an unknown N-atom state using a two-atom nonmaximally entangled state in cavity QED 总被引:1,自引:0,他引:1
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We present a scheme for realizing probabilistic teleportation of an unknown N-atom state via cavity QED. This scheme requires only a nonmaximally entangled pair to be used as a quantum channel, so the requirement of entanglement is reduced. In addition, our scheme does not involve the Bell-state measurement and is insensitive to the cavity decay, which is important from the experimental point of view. If the quantum channel is a two-atom maximally entangled state, teleportation of an unknown N-atom state can be realized by a simpler scheme via cavity QED. 相似文献
18.
H. Fakhri S. K. A. Seyed Yagoobi M. Taqavi 《International Journal of Theoretical Physics》2006,45(11):2100-2108
In the present paper the integration region Λ with more than one hidden variable is attributed to a pair of particles in the Bell's thought experiment as the local causal events in their common lightcone. Moreover, the possibility of uncommon causal events influencing the spin measurement is not ignored. Then, with regard to the separability of the influence of the uncommon events from configuration of the setup, and by relying on local realism and coherency, each of the Bell's inequality versions is obtained by measuring spin in three and four different directions.
PACS numbers: 03.65.Ud 03.65.Ta. 相似文献
19.
Bell's theorem without inequalities is applied for some general Greenberger-Horn-Zeilinger (GHZ) states and W states and a wide range of such states can exhibit all-versus-nothing conflict between local realism and quantum theory. The case of standard GHZ state is contained in our proposal. For some generalized GHZ states more intensive violation on local realism is manifested. 相似文献
20.
A scheme for approximate conditional teleportation of entangled two-mode cavity state without Bell state measurement
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An alternative scheme to approximately conditionally teleport entangled two-mode cavity state without Bell state measurement in cavity QED is proposed. The scheme is based on the resonant interaction of a ladder-type three-level atom with two bimodal cavities. The entangled cavity state is reconstructed with only one atom interacting with the two cavities successively. 相似文献