Publications (2)2.88 Total impact
-
Article: Experimental measurement of lower and upper bounds of concurrence for mixed quantum states
[show abstract] [hide abstract]
ABSTRACT: We experimentally measure the lower and upper bounds of concurrence for a set of two-qubit mixed quantum states using photonic systems. The measured concurrence bounds are in agreement with the results evaluated from the density matrices reconstructed through quantum state tomography. In our experiment, we propose and demonstrate a simple method for providing two faithful copies of a two-photon mixed state required for parity measurements: two photon pairs generated by two neighboring pump-laser pulses through optical parametric down-conversion processes represent two identical copies. This method can be conveniently generalized for entanglement estimation of multiphoton mixed states.Phys. Rev. A. 05/2009; 79(5). -
Article: Generation of arbitrary four-photon polarization-entangled decoherence-free states
[show abstract] [hide abstract]
ABSTRACT: We propose a scheme to generate four-photon polarization-entangled states, which enables the encoding of an arbitrary qubit into a four-qubit decoherence-free subspace robust against collective decoherence. The scheme is based on linear optical elements and postselection strategy, which is feasible with existing experimental technology.Physical Review A 03/2008; 77(4):42317. · 2.88 Impact Factor
Top co-authors
Top Journals
Institutions
-
2009
-
Southeast University (China)
Nanjing, Jiangxi Sheng, China
-
