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Hyperentanglement concentration for two-photon four-qubit systems with linear optics

Bao-Cang Ren, Fang-Fang Du, Fu-Guo Deng
2013 Physical Review A. Atomic, Molecular, and Optical Physics  
Subsequently, we present another two nonlocal hyperentanglement concentration protocols (hyper-ECPs) for the systems in partially hyperentangled unknown states, resorting to the Schmidt projection method  ...  It will be shown that our parameter-splitting method is very efficient for the concentration of the quantum systems in partially entangled states with known parameters, resorting to linear-optical elements  ...  The principle of the first two steps of our hyper-ECP for partially hyperentangled two-photon cluster states is the same as that in the hyper-ECP for partially hyperentangled Bell states, and an arbitrary  ... 
doi:10.1103/physreva.88.012302 fatcat:l222iqi4jrekxob2hadp2hhdgq

Generation and entanglement concentration for electron-spin entangled cluster states using charged quantum dots in optical microcavities

Jie Zhao, Chun-Hong Zheng, Peng Shi, Chun-Nian Ren, Yong-Jian Gu
2014 Optics Communications  
We present schemes for deterministically generating multi-qubit electron-spin entangled cluster states by the giant circular birefringence, induced by the interface between the spin of a photon and the  ...  Besides, we propose the entanglement concentration protocol to reconstruct a partially entangled cluster state into a maximally entangled one, resorting to the projection measurement on an ancillary photon  ...  Taking a concrete example, an equivalent 2 Â 4 cluster state can be prepared in two steps. First, all the electronic spins are entangled in a 1D cluster state as presented above.  ... 
doi:10.1016/j.optcom.2014.02.019 fatcat:xvjnbosv4rbvxliyxmqbpbbfhm

Efficient multipartite entanglement concentration of electron-spin state with charge detection [article]

Lan Zhou, Jiong Liu, Sheng-Yang Zhao
2012 arXiv   pre-print
We present two entanglement concentration protocols (ECPs) for arbitrary three-electron W state based on their charges and spins.  ...  Different from other ECPs, in both two ECPs, with the help of the electronic polarization beam splitter (PBS) and charge detection, the less-entangled W state can be concentrated into a maximally entangled  ...  In the first ECP, we adopt one pair of less-entangled W state and two auxiliary electrons to perform the concentration.  ... 
arXiv:1209.3545v1 fatcat:jevphk72pfh73pokrhey3dgvo4

Information Free Quantum Bus for Generating Stabiliser States

Simon J. Devitt, Andrew D. Greentree, Lloyd C. L. Hollenberg
2007 Quantum Information Processing  
Generally flying qubits are proposed for long range entangling interactions, however here we introduce a bus-mediated alternative for this task.  ...  Efficient generation of spatially delocalised entangled states is at the heart of quantum information science.  ...  Maruyama for helpful discussions.  ... 
doi:10.1007/s11128-007-0055-4 fatcat:mczs75odafedzkwiliwmc4v4x4

Entanglement generation via a completely mixed nuclear spin bath

H. Christ, J. I. Cirac, G. Giedke
2008 Physical Review B  
Straightforward protocols for the generation of multipartite entangled (Greenberger-Horne-Zeilinger-)states are presented.  ...  We show the feasibility of an experimental realization in a quantum dot by the hyperfine interaction of an electron with the nuclear spins.  ...  Considering two off-resonant electrons and reinserting the ancilla for a time ∆t 1 again, the complete two-electron state after a ↓ measurement becomes ρ ∝ ξ 2 Ij ,mj |Φ + j Φ + j |, and |Φ + j = | +  ... 
doi:10.1103/physrevb.78.125314 fatcat:byfpobt65bbilkesazxhmf4tru

Photonic Architecture for Scalable Quantum Information Processing in Diamond

Kae Nemoto, Michael Trupke, Simon J. Devitt, Ashley M. Stephens, Burkhard Scharfenberger, Kathrin Buczak, Tobias Nöbauer, Mark S. Everitt, Jörg Schmiedmayer, William J. Munro
2014 Physical Review X  
Modules are connected by photons propagating in a fiber-optical network and collectively used to generate a topological cluster state, a robust substrate for quantum information processing.  ...  Many physical systems have been identified as candidates for quantum information processing, but none of them are immune from errors.  ...  SHARING ENTANGLED STATES BETWEEN THREE MODULES The next step is to extend our cluster of two nuclear spin qubits to three (by adding one).  ... 
doi:10.1103/physrevx.4.031022 fatcat:gexuuxomhzczfiwdbt6uxty7ye

Optical hybrid approaches to quantum information [article]

Peter van Loock
2010 arXiv   pre-print
implementations of quantum communication and quantum computation, when the toolbox is restricted to the most practical set of linear operations and resources such as linear optics and Gaussian operations and states  ...  Acknowledgements I would like to thank the DFG for financial support through the Emmy Noether programme.  ...  At the very beginning of a cluster computation, the cluster computer may be initiated in a product of 'blank' basis states |+ such that no extra encoding teleportation step is needed; an arbitrary state  ... 
arXiv:1002.4788v1 fatcat:w7yolttclrduddj26c34jbtxqa

Modeling the decay of entanglement for electron spin qubits in quantum dots

F Bodoky, O Gühne, M Blaauboer
2009 Journal of Physics: Condensed Matter  
By comparing the time required for detection with the time required for generation and manipulation of entanglement, we estimate for a range of different entangled states how many qubits can be entangled  ...  We also introduce filtered witness operators, which extend the available detection time, and investigate this detection time for various multipartite entangled states.  ...  Acknowledgments This work has been supported by The Netherlands Organisation for Scientific Research (NWO), the FWF (START prize) and the EU (SCALA, OLAQUI, QICS).  ... 
doi:10.1088/0953-8984/21/39/395602 pmid:21832394 fatcat:jdfojwbakvfyleuip4iofxkffe

Multi-hop teleportation of an unknown four-qubit cluster state based on cluster states with minimum resource

Ling-Yun Cao, Shi-Bei Xue, Min Jiang
2020 IEEE Access  
In this paper, we first present a scheme for teleporting an unknown four-qubit cluster state via a cluster state chain between two distant nodes, which do not share entanglement pairs directly.  ...  Adjacent nodes are linked by a partially entangled four-qubit cluster state with each other.  ...  Later in 2017, Du and Long [48] reported an entanglement concentration protocol for an unknown four-electron-spin cluster state by exploring the optical selection rules derived from the quantum-dot spins  ... 
doi:10.1109/access.2020.2991065 fatcat:k4ut2sizbbad3b7mautfvtxphu

Multipartite electronic entanglement purification with charge detection

Yu-Bo Sheng, Fu-Guo Deng, Gui-Lu Long
2011 Physics Letters A  
We present a multipartite entanglement purification scheme in a Greenberger-Horne-Zeilinger state for electrons based on their spins and their charges.  ...  By repeating these two steps, the parties in quantum communication can get some high-fidelity multipartite entangled electronic systems.  ...  Moreover, people have constructed entangled spins [37] , achieved the entanglement concentration [38] , prepared cluster states and designed a multipartite entanglement analyzer [39] with charge detections  ... 
doi:10.1016/j.physleta.2010.11.018 fatcat:kvwdmvyzrfbe7mux5eoy3n2en4

Capacitative coupling of singlet-triplet qubits in different interqubit geometries

Tuukka Hiltunen, Ari Harju
2014 Physical Review B  
The analysis of geometry on the capacitative coupling is also extended to the many-qubit case and the creation of cluster states.  ...  of the singlet and triplet states.  ...  The total number of entangling steps for obtaining a cluster state spanning the whole array is thus M + 1.  ... 
doi:10.1103/physrevb.90.125303 fatcat:hab7danh7zhyhacvi5vvflfste

Colloquium: Quantum networks with trapped ions

L.-M. Duan, C. Monroe
2010 Reviews of Modern Physics  
Taken together, these quantum platforms offer a promising vision for the realization of a large-scale quantum network that could impact the future of communication and computation.  ...  Quantum computation and communication exploit the quantum properties of superposition and entanglement in order to perform tasks that may be impossible using classical means.  ...  ACKNOWLEDGMENTS It is a great pleasure to acknowledge our collaborators for the works described in this Colloquium.  ... 
doi:10.1103/revmodphys.82.1209 fatcat:ek3ljgwrjfadnjmrul6npol4w4

Analytical recursive method to ascertain multisite entanglement in doped quantum spin ladders

Sudipto Singha Roy, Himadri Shekhar Dhar, Debraj Rakshit, Aditi Sen(De), Ujjwal Sen
2017 Physical review B  
Importantly, our results show that within specific doping concentration and model parameter regimes, the doped RVB state essentially characterizes the trends of genuine multiparty entanglement in the exact  ...  We prove that doped RVB ladder states are always genuine multipartite entangled.  ...  One should stress here that entanglement entropy captures the distribution of entanglement between two blocks of the system constituted of connected cluster of spins.  ... 
doi:10.1103/physrevb.96.075143 fatcat:toj3mjz3rve55jm3eylv7tezou

Electron and boson clusters in confined geometries: Symmetry breaking in quantum dots and harmonic traps

C. Yannouleas, U. Landman
2006 Proceedings of the National Academy of Sciences of the United States of America  
In a first example, we use calculations for two electrons in an elliptic quantum dot to show that the electrons can localize and form a molecular dimer.  ...  We discuss the formation of crystalline electron clusters in semiconductor quantum dots and of crystalline patterns of neutral bosons in harmonic traps.  ...  Of special interest for quantum computing (21) is the degree of entanglement exhibited by the two-electron molecule in its singlet state.  ... 
doi:10.1073/pnas.0509041103 pmid:16740665 pmcid:PMC1502278 fatcat:2j7drkbvhvdj3ihfrdjzxc273q

Multipartite entangled magnon states as quantum communication channels [article]

Sriram Prasath E., Sreraman Muralidharan, Chiranjib Mitra, Prasanta K. Panigrahi
2009 arXiv   pre-print
Later, an explicit protocol for the splitting and sharing of a two qubit entangled state among two parties, using this state as an entangled resource, is demonstrated.  ...  We explicate conditions under which, the two magnon state becomes highly entangled and is useful for several quantum communication protocols.  ...  Further, it was proved that one can devise (N − 2n) protocols for the QIS of an arbitrary n qubit state using a genuinely entangled N qubit state as an entangled channel among two parties, in the case  ... 
arXiv:0905.1233v2 fatcat:qrcdpeofgve6xlgmsesvosmqje
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