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research [2015/11/12 05:40]
yuanzs [Quantum information processing with ultracold atoms]
research [2015/11/12 05:41] (current)
yuanzs [Quantum information processing with ultracold atoms]
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 Quantum entanglement is the essential resource for various algorithms on quantum information processing. Typical entangled systems include photonic entanglement of 8 photons[3,4] and a large entangled array of 14 ions [5]. One may ask, what is the limit of the number of entangled particles? As it is known to us, multi-photon entanglement is normally obtained per connecting photon pairs. Well, photon pairs are generated through parametric down conversion and this process is probabilistic, say with a probability of around 1%. Therefore, it is extremely hard to scale up photonic entanglement of more than ten photons since one needs 5 pairs of photons and the probability of success is now 0.01<sup>5</sup>=10<sup>-10</sup>. Though in principle entangled system of ions is scalable, the largest entangled state is up to 14 ions while the researchers are now struggling with the decoherece induced by the noisy environment.   Quantum entanglement is the essential resource for various algorithms on quantum information processing. Typical entangled systems include photonic entanglement of 8 photons[3,4] and a large entangled array of 14 ions [5]. One may ask, what is the limit of the number of entangled particles? As it is known to us, multi-photon entanglement is normally obtained per connecting photon pairs. Well, photon pairs are generated through parametric down conversion and this process is probabilistic, say with a probability of around 1%. Therefore, it is extremely hard to scale up photonic entanglement of more than ten photons since one needs 5 pairs of photons and the probability of success is now 0.01<sup>5</sup>=10<sup>-10</sup>. Though in principle entangled system of ions is scalable, the largest entangled state is up to 14 ions while the researchers are now struggling with the decoherece induced by the noisy environment.  
  
-A promising system, optical lattices [6], might have bright future for creating and manipulating multipartite entanglement of neutral atoms. This assumption is based on the experiments that a huge amount of atoms can be coherently controlled in definite quantum states. One can prepare massive qubits deterministically via a phase transition from superfluid to Mott insulator (macroscopically).With the state-of-the-art technique of manipulating single atomic spins [7,8]  +A promising system, optical lattices [6], might have bright future for creating and manipulating multipartite entanglement of neutral atoms. This assumption is based on the experiments that a huge amount of atoms can be coherently controlled in definite quantum states. One can prepare massive qubits deterministically via a phase transition from superfluid to Mott insulator (macroscopically).With the state-of-the-art technique of manipulating single atomic spins [7,8], one may implement scalable entangled state, the essential resource for quantum computation.
    
   - R. Feynman, Simulating physics with computers, http://link.springer.com/article/10.1007%2FBF02650179.   - R. Feynman, Simulating physics with computers, http://link.springer.com/article/10.1007%2FBF02650179.
research.txt · Last modified: 2015/11/12 05:41 by yuanzs