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Atomic entanglement purification using photonic Faraday rotation [article]

Yu-Bo Sheng, Sheng-Yang Zhao, Jiong Liu
2012 arXiv   pre-print
We describe an entanglement purification protocol (EPP) for atomic entangled pair using photonic Faraday rotation.  ...  As the photonic Faraday rotation works on the low-Q cavities, this EPP is useful in both quantum communication and computation.  ...  In conclusion, we have presented an EPP for atomic entanglement with photonic Faraday rotation.  ... 
arXiv:1209.6530v1 fatcat:4sftjfo2lzbdtmbovtnixvdrti

Atomic and photonic entanglement concentration via photonic Faraday rotation

Zhao-Hui Peng, Jian Zou, Xiao-Juan Liu, Yong-Jun Xiao, Le-Man Kuang
2012 Physical Review A. Atomic, Molecular, and Optical Physics  
We propose two alternative entanglement concentration protocols (ECPs) using the Faraday rotation of photonic polarization.  ...  The distinct feature of our protocols is that we can concentrate both atomic and photonic entangled states via photonic Faraday rotation, and thus they may be universal and useful for entanglement concentration  ...  We propose two alternative entanglement concentration protocols (ECPs) using the Faraday rotation of photonic polarization.  ... 
doi:10.1103/physreva.86.034305 fatcat:j3f5e32lubff5garhhe2wzsf2u

Entanglement swapping of atomic states through the photonic Faraday rotation [article]

W.P. Bastos, W.B. Cardoso, A.T. Avelar, B. Baseia
2010 arXiv   pre-print
We propose an entanglement swapping of atomic states confined by cavities QED using a photonic Faraday rotation.  ...  After interacting with an atom trapped inside the cavity the system evolves to an entangled atom-photon state.  ...  swapping of atomic states confined in cavities QED using photonic Faraday rotation.  ... 
arXiv:1005.1189v1 fatcat:meh5mdpvufee7omubp5powx43m

Multipartite entanglement purification for three-level trapped atom systems [article]

Yu-Bo Sheng, Jiong Liu, Sheng-Yang Zhao
2012 arXiv   pre-print
We describe an entanglement purification protocol (EPP) for multipartite three-level atomic entangled pair using photonic Faraday rotation.  ...  This protocol resorts to the photonic Faraday rotation to realize the function of the controlled-Not (CNOT) gate.  ...  In conclusion, we have presented an MEPP for purifying multipartite atomic entanglement using photonic Faraday rotation.  ... 
arXiv:1210.7077v1 fatcat:fgwl7edhurghnfa6lz72wlumve

Efficient entanglement purification for polarization logic Bell state with the photonic Faraday rotation [article]

Lan Zhou, Yu-Bo Sheng
2016 arXiv   pre-print
During the protocol, we only require to measure the atom states, and it is useful for improving the entanglement of photon systems in future large-scale quantum networks.  ...  to the photon-atom interaction in low-quality (Q) cavity and atomic state measurement.  ...  With the help of the photonic Faraday rotation effect and the atomic state and photon state measurement, they can finally distill new mixed photon state.  ... 
arXiv:1601.05980v1 fatcat:6x7ffqy37ndtxl52zzekvd4eja

Quantum repeaters free of polarization disturbance and phase noise

Zhen-Qiang Yin, Yi-Bo Zhao, Yong Yang, Zheng-Fu Han, Guang-Can Guo
2009 Physical Review A. Atomic, Molecular, and Optical Physics  
Through single-atom cavity-QED technology and linear optics, this scheme can be implemented easily.  ...  Fortunately, two-photon interference type quantum repeaters can be immune to phase noise of the channel.  ...  This heralded entanglement generation is also a built-in entanglement purification process [6] .  ... 
doi:10.1103/physreva.79.044302 fatcat:e25m4j5ggbc4dos36tos37xem4

Quantum interface between light and atomic ensembles

Klemens Hammerer, Anders S. Sørensen, Eugene S. Polzik
2010 Reviews of Modern Physics  
light, quantum entanglement between atomic ensembles and light, and quantum teleportation with atomic ensembles.  ...  We discuss various mechanisms used for the quantum interface, including quantum nondemolition or Faraday interaction, quantum measurement and feedback, Raman interaction and electromagnetically induced  ...  purification and error correction .  ... 
doi:10.1103/revmodphys.82.1041 fatcat:zfm7hvcncrbinbs7eydlrocnbi

Concurrence Measurement for the Two-Qubit Optical and Atomic States

Lan Zhou, Yu-Bo Sheng
2015 Entropy  
Concurrence provides us an effective approach to quantify entanglement, which is quite important in quantum information processing applications.  ...  Third, we introduce some protocols for measuring the concurrence of the atomic entanglement system.  ...  F = φ − φ 0 is defined as the photonic Faraday rotation.  ... 
doi:10.3390/e17064293 fatcat:3bzdp6qkknaipassw7zqnnpkk4

Generation, characterization and use of atom-resonant indistinguishable photon pairs [article]

Morgan W. Mitchell
2015 arXiv   pre-print
We describe the generation of atom-resonant indistinguishable photon pairs using nonlinear optical techniques, their spectral purification using atomic filters, characterization using multi-photon interference  ...  The emission from these frequency-degenerate modes is separated from other cavity emission using ultra-narrow atomic frequency filters, either a Faraday anomalous dispersion optical filter (FADOF) with  ...  Aephraim Steinberg was essential to getting the photon pair research started. The contributions of Zehui Zhai, Yannick de Icaza Astiz and Gianvito Lucivero are also much appreciated.  ... 
arXiv:1502.07615v1 fatcat:vjx7e4oz5fcrlmxkfsgp2pekyu

Towards quantum networks of single spins: analysis of a quantum memory with an optical interface in diamond

M. S. Blok, N. Kalb, A. Reiserer, T. H. Taminiau, R. Hanson
2015 Faraday discussions  
Initial experiments on trapped atoms and ions as well as defects in diamond have demonstrated entanglement between two nodes over several meters.  ...  Such memories allow for entanglement distillation, purification and quantum repeater protocols that extend the size, speed and distance of the network.  ...  Loretz for useful discussions.  ... 
doi:10.1039/c5fd00113g pmid:26411802 fatcat:x3mgzf63ffdknieobeb2jjymom

Fault-tolerant quantum repeaters with minimal physical resources and implementations based on single-photon emitters

L. Childress, J. M. Taylor, A. S. Sørensen, M. D. Lukin
2005 Physical Review A. Atomic, Molecular, and Optical Physics  
Furthermore, the coupled electron and nuclear spins can be used to efficiently implement entanglement swapping and purification.  ...  discuss its implementation using realistic photon emitters and photonic channels.  ...  Another physical implementation for quantum repeaters uses atomic ensembles as a long-lived memory for photons [15] .  ... 
doi:10.1103/physreva.72.052330 fatcat:j6rz7rtsnzhbbgesdfosvo5r5a

Towards Quantum Repeaters with Solid-State Qubits: Spin-Photon Entanglement Generation Using Self-assembled Quantum Dots [chapter]

Peter L. McMahon, Kristiaan De Greve
2015 Engineering the Atom-Photon Interaction  
entanglement between a quantum memory (electron spin qubit) and a flying qubit (polarization- or frequency-encoded photonic qubit).  ...  We also place this experimental work in context by providing an overview of quantum repeaters, their potential uses, and the challenges in implementing them.  ...  We would like to thank especially Yoshihisa Yamamoto (who supervised these works), Thaddeus Ladd, Christian Schneider and Cody Jones for numerous conversations about the place and use of quantum dots in  ... 
doi:10.1007/978-3-319-19231-4_14 fatcat:o6fouv6k2fau3kydmy7oat56fq

Entanglement concentration for two atomic ensembles using an effective atom-light beamsplitter

R Tatham, N Korolkova
2011 Journal of Physics B: Atomic, Molecular and Optical Physics  
The entanglement concentration protocol itself uses the procrustean method, similar to that first devised for light by Browne et al [2003 Phys Rev A 67 062320] and includes photon counting after the interaction  ...  We present a protocol for increasing the entanglement between two atomic ensembles based on applying an approximate atom-light beamsplitter transformation to both ensembles.  ...  A double pass scheme [17] can be used for the generation of polarization squeezed light by optical Faraday rotation.  ... 
doi:10.1088/0953-4075/44/17/175506 fatcat:y53py34pmndzrkqrtadjfaapqy

Entanglement between remote continuous-variable quantum systems: Effects of transmission loss

Lars Bojer Madsen, Klaus Mølmer
2006 Physical Review A. Atomic, Molecular, and Optical Physics  
We study the effects of losses on the entanglement created between two separate atomic gases by optical probing and homodyne detection of the transmitted light.  ...  In an asymmetric setup where light is only sent one way through the atomic samples, we find that the logarithmic negativity of entanglement attains a constant value − log 2 (N ) with N = 1/3 irrespectively  ...  In theory [8] and experiment [2] , entanglement between two trapped atomic gases is generated when the atoms are probed by off-resonant light (effective Faraday rotation interaction), and the transmitted  ... 
doi:10.1103/physreva.74.012320 fatcat:jd2tlbseubbabexrwfvtivuwfa

Entanglement between remote continuous variable quantum systems: effects of transmission loss [article]

Lars Bojer Madsen, Klaus Molmer
2006 arXiv   pre-print
We study the effects of losses on the entanglement created between two separate atomic gases by optical probing and homodyne detection of the transmitted light.  ...  In an asymmetric setup where light is only sent one way through the atomic samples, we find that the logarithmic negativity of entanglement attains a constant value -_2(N) with N=1/3 irrespectively of  ...  In theory [8] and experiment [2] , entanglement between two trapped atomic gases is generated when the atoms are probed by off-resonant light (effective Faraday rotation interaction), and the transmitted  ... 
arXiv:quant-ph/0603265v1 fatcat:juwgkbeagzccpk3khgnzolriza
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