4,314 Hits in 3.3 sec

Distilling and protecting the single-photon entangled state [article]

Lan Zhou, Yu-Bo Sheng
2014 arXiv   pre-print
These protocols only require one pair of less-entangled single-photon entangled state and some auxiliary single photons, which makes them economical.  ...  We propose two efficient entanglement concentration protocols (ECPs) for arbitrary less-entangled single-photon entanglement (SPE).  ...  Both they not only can distill the maximally entangled singlephoton entangled state from arbitrary less-entangled single-photon entangled state, but also can protect its polarization characteristics.  ... 
arXiv:1411.0744v1 fatcat:7q3g7kv3kffxlczcj2iw6y2fx4

An error-free protocol for quantum entanglement distribution in long-distance quantum communication

Shamsolah Salemian, Shahram Mohammadnejad
2011 Chinese Science Bulletin  
An error-free protocol for quantum entanglement distribution in long-distance quantum communication. al. Quantum secure direct communication with high-dimension quantum superdense coding.  ...  In other words, if there is a bit flip along the quantum channel, the end stations (Alice and Bob) can detect this state change and obtain the correct state (entangled photon) at another port.  ...  This protocol required a single entangled photon pair generated by an ideal source. The currently available source of entangled photons is not an ideal entangled source. Sheng et al.  ... 
doi:10.1007/s11434-010-4336-4 fatcat:g5ob3ujhkzf37owbyuj6em5et4

Broadband-laser-diode pumped PPKTP-Sagnac polarization-entangled photon source [article]

Neng Cai, Wu-Hao Cai, Shun Wang, Fang Li, Ryosuke Shimizu, Rui-Bo Jin
2021 arXiv   pre-print
This high-quality and low-cost entangled photon source may have many practical applications in quantum information processing.  ...  We experimentally demonstrate a polarization-entangled photon source at 810 nm using a type-II phase-matched PPKTP crystal pumped by a low-cost, broadband laser diode with a central wavelength of 405 nm  ...  In practical use, the low-cost and high stability entangled photon sources are indispensable.  ... 
arXiv:2105.00454v2 fatcat:gdvqpd5g3ng47d476vpvzour74

Practical Quantum Communication and Cryptography for WDM Optical Networks

Prem Kumar
2004 AIP Conference Proceedings  
With such a source we have demonstrated storage of entanglement for up to 1/8 of a millisecond.  ...  Along the first front, with our in-fiber entanglement source all four Bell states can be readily produced and we have demonstrated violation of Bell's inequalities by up to 10 standard deviations of measurement  ...  Distribution and Storage of Entanglement To demonstrate the practicality of our fiber-based source of polarization-entangled photons [6] in long-distance distribution of entanglement, we separated the  ... 
doi:10.1063/1.1834371 fatcat:w5gc4uza4zdubj7vgtv2bri24u

Topological protection versus degree of entanglement of two-photon light in photonic topological insulators

Konrad Tschernig, Álvaro Jimenez-Galán, Demetrios N. Christodoulides, Misha Ivanov, Kurt Busch, Miguel A. Bandres, Armando Perez-Leija
2021 Nature Communications  
The feasibility of engineering quantum Hamiltonians with photonic tools, combined with the availability of entangled photons, raises the intriguing possibility of employing topologically protected entangled  ...  However, while two-photon states built as a product of two topologically protected single-photon states inherit full protection from their single-photon "parents", a high degree of non-separability may  ...  However, we can always find two-photon states with a considerable amount of entanglement, which are protected.  ... 
doi:10.1038/s41467-021-22264-3 pmid:33785744 fatcat:lez7yy3ilzdenlg3bixmn4zxxm

Distilling single-photon entanglement from photon loss and decoherence [article]

Yu-Bo Sheng, Lan Zhou
2013 arXiv   pre-print
Here we present a practical protocol for distilling the single-photon entanglement from both photon loss and decoherence.  ...  With the help of some local single photons, the probability of single photon loss can be decreased and the less-entangled state can also be recovered to maximally entangled state simultaneously.  ...  The single-photon entangled state can be prepared with the single-photon source and the 50:50 beam splitter (BS).  ... 
arXiv:1306.1601v2 fatcat:nip3hojvuraelptdvbrecdym4a

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).  ...  This is a first step towards demonstrating entanglement between distant quantum memories (realized with quantum dots), which in turn is a milestone in the roadmap for building a functional quantum repeater  ...  Acknowledgements We would like to acknowledge our coauthors of those papers covered in this chapter that we were involved in (namely References [13, 21, 24] ), with whom we had many valuable discussions  ... 
doi:10.1007/978-3-319-19231-4_14 fatcat:o6fouv6k2fau3kydmy7oat56fq

Experimental remote entanglement distribution in a photonic quantum network through multinode indistinguishability [article]

Yan Wang, Ze-Yan Hao, Zheng-Hao Liu, Kai Sun, Jin-Shi Xu, Chuan-Feng Li, Guang-Can Guo, Alessia Castellini, Bruno Bellomo, Giuseppe Compagno, Rosario Lo Franco
2021 arXiv   pre-print
However, entanglement swapping is a demanding task in practice, mainly because of limited effectiveness of entangled photon sources and Bell-state measurements necessary to realize the process.  ...  Photonic quantum networking relies on entanglement distribution between distant nodes, typically realized by swapping procedures.  ...  However, entanglement swapping is a demanding task in practice, mainly because of limited effectiveness of entangled photon sources and Bell-state measurements necessary to realize the process.  ... 
arXiv:2107.03999v2 fatcat:ebssiwixrzgb3hjt2wlygk43zi

Entangled Photon-Pair Sources based on three-wave mixing in bulk crystals [article]

Ali Anwar, Chithrabhanu Perumangatt, Fabian Steinlechner, Thomas Jennewein, Alexander Ling
2020 arXiv   pre-print
The increased prominence of quantum networks has led to growing interest in deployable high performance entangled photon-pair sources.  ...  Entangled photon-pairs are a critical resource in quantum communication protocols ranging from quantum key distribution to teleportation.  ...  Also, Table IV gives the list of some applications of entangled photon sources and their practical realization using different source designs. A.  ... 
arXiv:2007.15364v1 fatcat:r66umiz4sbhidauxetjqfsuddq

Entangled photon polarimetry

Joseph B. Altepeter, Neal N. Oza, Milja Medić, Evan R. Jeffrey, Prem Kumar
2011 Optics Express  
We construct an entangled photon polarimeter capable of monitoring a two-qubit quantum state in real time.  ...  Using this polarimeter, we record a nine frames-per-second video of a two-photon state's transition from separability to entanglement.  ...  and deploying entangled photon sources.  ... 
doi:10.1364/oe.19.026011 pmid:22274190 fatcat:xiz2arfcavcobe27lnxmpopcru

Experimental non-local generation of entanglement from independent sources [article]

Xian-Min Jin, Jügen Röch, Juan Yin, Tao Yang
2010 arXiv   pre-print
We experimentally demonstrate a non-local generation of entanglement from two independent photonic sources in an ancilla-free process .  ...  Entanglement is further verified by the way of the measured violation of a CHSH type Bell's inequality with S-values of 2.54 and 27 standard deviations.  ...  Our scheme works ideally with true independent single photon input. In our proof-ofprinciple experiment, we employ disentangled photons from SPDC sources as the two input photons.  ... 
arXiv:1005.1426v1 fatcat:kqxaitk3zbgt7pfvrruwgqpaku

Remotely Establishing Polarization Entanglement over Noisy Polarization Channels [article]

Sebastian Ecker, Philipp Sohr, Lukas Bulla, Rupert Ursin, Martin Bohmann
2021 arXiv   pre-print
Quantum information can be encoded in different degrees of freedom (DoF) of photons, where each encoding comes with its own advantages and disadvantages with respect to noise resilience and practicality  ...  In particular, we distribute robust energy-time entanglement and transfer it to polarization entanglement at the communicating parties.  ...  We acknowledge the European Union's Horizon 2020 programme grant agreement No. 857156 (OpenQKD) and the Austrian Academy of Sciences in cooperation with the FhG ICON-Programm "Integrated Photonic Solutions  ... 
arXiv:2110.04159v1 fatcat:wwuhuetwrnbz7gt24ycrombikq

Protecting quantum superpositions from the outside world

Alexander Lvovsky
2009 Physics  
An entangled state of six photons could potentially carry quantum information over large distances and between different reference frames.  ...  on its polarization -and finally, single-photon detectors.  ...  A good example of a quantum bit is a single photon traveling down an optical fiber.  ... 
doi:10.1103/physics.2.83 fatcat:5xndy5hk3bbftnegmpdo5jbdau

Practical limitations in optical entanglement purification

Peter P. Rohde, Timothy C. Ralph, William J. Munro
2006 Physical Review A. Atomic, Molecular, and Optical Physics  
Entanglement purification protocols play an important role in the distribution of entangled systems, which is necessary for various quantum information processing applications.  ...  We derive necessary detector and mode-matching requirements to facilitate practical operation of such a scheme, without having to resort to destructive coincidence type demonstrations.  ...  For this reason, entanglement purification schemes ͓1-5͔ are of practical interest, since they allow us to purify a desired entangled state with higher fidelity from multiple copies which have been subject  ... 
doi:10.1103/physreva.73.030301 fatcat:a2if7ucdfrawbkp6qbjjpquyvm

Experimental demonstration of functional quantum repeater nodes with absorptive quantum memories [article]

Xiao Liu, Jun Hu, Zong-Feng Li, Xue Li, Pei-Yun Li, Peng-Jun Liang, Zong-Quan Zhou, Chuan-Feng Li, Guang-Can Guo
2021 arXiv   pre-print
We build two nodes separated by 3.5 m, each contains a polarization-entangled photon-pair source and a solid-state quantum memory.  ...  A joint Bell-state measurement in the middle station heralds the successful generation of maximally-entangled states between the two quantum memories with a fidelity of (80.4±2.1) compatible with deterministic  ...  In practice, with the presence of two-photon terms (|HV 2 and |HV 3 ), the success probability of BSM becomes 1/8.  ... 
arXiv:2101.04945v1 fatcat:s7xnysfafreo7n4icghx7yu4nq
« Previous Showing results 1 — 15 out of 4,314 results