搜索结果: 1-13 共查到“量子力学 qubits”相关记录13条 . 查询时间(0.093 秒)
Two Local Observables are Sufficient to Characterize Maximally Entangled States of N Qubits
Local Observables Characterize Maximally Entangled States
2010/11/8
Maximally entangled states (MES) represent a valuable resource in quantum information processing. In $N$-qubit systems the MES are $N$-GHZ states, i.e. the collection of $\ket{GHZ_N}=\frac{1}{\sqrt{2}...
Entanglement dynamics of two qubits under the influence of external kicks and Gaussian pulses
Entanglement dynamics two qubits influence external kicks Gaussian pulses
2010/10/19
We have investigated the dynamics of entanglement between two spin-1/2 qubits that are sub-
ject to independent kick and Gaussian pulse type external magnetic elds analytically as well as numericall...
Physicists in the US have used an optical "frequency comb" to reliably entangle a pair of atomic qubits. The breakthrough bodes well for practicable quantum computing because it allows for simpler man...
Two-spinors, oscillator algebras, and qubits: Aspects of manifestly covariant approach to relativistic quantum information
Two-spinors SL(2,C) qubits quantization
2010/3/10
The first part of the paper reviews applications of 2-spinor methods to relativistic qubits (analogies between tetrads in Minkowski space and 2-qubit states, qubits defined by means of null directions...
Heralded Entanglement of Arbitrary Degree in Remote Qubits
Heralded Entanglement Arbitrary Degree Remote Qubits
2010/4/8
Incoherent scattering of photons off two remote atoms with a Lambda-level structure is used as a basic Young-type interferometer to herald long-lived entanglement of an arbitrary degree. The degree of...
Bright and Dark periods in the Entanglement Dynamics of Interacting Qubits in Contact with the Environment
Bright and Dark periods Entanglement Dynamics Interacting Qubits Environment
2010/4/8
Interaction among the qubits are basis to many quantum logic operations. We report how such inter-qubit interactions can lead to new features, in the form of bright and dark periods in the entanglemen...
Simple pulses for elimination of leakage in weakly nonlinear qubits
Simple pulses elimination of leakage weakly nonlinear qubits
2010/4/12
In realizations of quantum computing, a two-level system (qubit) is often singled out of the many levels of an anharmonic oscillator. In these cases, simple qubit control fails on short time scales be...
High fidelity transport of trapped-ion qubits through an X-junction trap array
High fidelity transport of trapped-ion qubits through an X-junction trap array
2010/4/7
We report reliable transport of 9Be+ ions through a 2-D trap array that includes a separate loading/reservoir zone and an "X-junction". During transport the ion's kinetic energy in its local well incr...
Complete proof of Gisin's theorem for three qubits
Complete proof Gisin's theorem three qubits
2010/4/8
Gisin's theorem assures that for any pure bipartite entangled state, there is violation of Bell-CHSH inequality revealing its contradiction with local realistic model. Whether, similar result holds fo...
The relevance of random choice in tests of Bell inequalities with atomic qubits
random choice tests Bell inequalities atomic qubits
2010/4/7
It is pointed out that a loophole exists in experimental tests of Bell inequality using atomic qubits, due to possible errors in the rotation angles of the atomic states. A sufficient condition is der...
Generation of GHZ and W states for stationary qubits in spin network via resonance scattering
Generation of GHZ W states stationary qubits spin network
2010/4/7
We propose a simple scheme to establish entanglement among stationary qubits based on the mechanism of resonance scattering between them and a single-spin-flip wave packet in designed spin network. It...
Controlled-NOT logic with nonresonant Josephson phase qubits
Controlled-NOT logic nonresonant Josephson phase
2010/4/7
We establish theoretical bounds on qubit detuning for high fidelity controlled-NOT logic gate implementations with weakly coupled Josephson phase qubits. It is found that the value of qubit detuning d...
Quantum Privacy Amplification for a Sequence of Single Qubits
quantum privacy amplification quantum secure direct communication
2007/8/15
2006Vol.46No.3pp.443-446DOI:
Quantum Privacy Amplification for a Sequence of Single Qubits
DENG Fu-Guo1,2 and LONG Gui-Lu3,4
1 The Key Laboratory of Beam Technology and ...