Experimental demonstration of five-photon entanglement and open-destination teleportation

Zhao, Zhi; Chen, Yu-Ao; Zhang, Anning; Yang, Tao; Briegel, Hans J.; Pan, Jian-Wei

doi:10.1038/nature02643

Cited by 591 publications

(432 citation statements)

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“…The extension of the attained results to higher dimensional QI qubit carriers could lead to new information processing tasks [10] and requires the development of appropriate technological and theoretical tools. Significant results in this field are the SPDC generation of fourphoton entangled states with or without "quantum-injection" [11][12][13][14][15][16]. At the same time, the sophisticated level attained by QI processing of photonic qubits has directed a consistent part of the experimental endeavour towards the solution of more technical problems.…”

Section: Introductionmentioning

confidence: 99%

Nonseparable Werner states in spontaneous parametric down-conversion

et al. 2006

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The multiphoton states generated by high-gain spontaneous parametric down-conversion (SPDC) in presence of large losses are investigated theoretically and experimentally. The explicit form for the two-photon output state has been found to exhibit a Werner structure very resilient to losses for any value of the gain parameter, g. The theoretical results are found in agreement with the experimental data. The last ones are obtained by quantum tomography of the state generated by a high-gain SPDC.

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Section: Introductionmentioning

confidence: 99%

Nonseparable Werner states in spontaneous parametric down-conversion

et al. 2006

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“…Therefore, as in previous teleportation experiments [9][10][11] , in reality our teleportation only occurs posteriorly, that is, conditional on detecting a threefold coincidence. Moreover, owing to the imperfect retrieve, collection and detection efficiency of the teleported states, 30%, 75% and 50% respectively (see the Methods section), in our experiment the overall teleportation success probability is about 10 −6 per experimental run.…”

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confidence: 99%

Memory-built-in quantum teleportation with photonic and atomic qubits

et al. 2008

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The combination of quantum teleportation 1 and quantum memory 2-5 of photonic qubits is essential for future implementations of large-scale quantum communication 6 and measurement-based quantum computation 7,8 . Both steps have been achieved separately in many proof-of-principle experiments 9-14 , but the demonstration of memory-built-in teleportation of photonic qubits remains an experimental challenge. Here, we demonstrate teleportation between photonic (flying) and atomic (stationary) qubits. In our experiment, an unknown polarization state of a single photon is teleported over 7 m onto a remote atomic qubit that also serves as a quantum memory. The teleported state can be stored and successfully read out for up to 8 µs. Besides being of fundamental interest, teleportation between photonic and atomic qubits with the direct inclusion of a readable quantum memory represents a step towards an efficient and scalable quantum network 2-8 .Quantum teleportation 1 , a way to transfer the state of a quantum system from one place to another, was first demonstrated between two independent photonic qubits 9 ; later developments include demonstration of entanglement swapping 10 , open-destination teleportation 11 and teleportation between two ionic qubits 15,16 . Teleportation has also been demonstrated for a continuous-variable system, that is, transferring a quantum state from one light beam to another 17 and, more recently, even from light to matter 18 . However, the above demonstrations have several drawbacks, especially in long-distance quantum communication. On the one hand, the absence of quantum storage makes the teleportation of light alone non-scalable. On the other hand, in teleportation of ionic qubits, the shared entangled pairs were created locally, which limits the teleportation distance to a few micrometres and is difficult to extend to large distances. In continuous-variable teleportation between light and matter, the experimental fidelity is extremely sensitive to the transmission loss-even in the ideal case, only a maximal attenuation of 10 −1 is tolerable 19 . Moreover, the complicated protocol required for retrieving the teleported state in the matter 20 is beyond the reach of current technology.The combination of quantum teleportation and quantum memory of photonic qubits 2-5 could provide a novel way to overcome these drawbacks. Here, we achieve this appealing combination by experimentally implementing teleportation between discrete photonic (flying) and atomic (stationary) qubits.In our experiment, we use the polarized photonic qubits as the information carriers and the collective atomic qubits [2][3][4][5]12 (an effective qubit consists of two atomic ensembles, each with 10 6 rubidium-87 atoms) as the quantum memory. In memorybuilt-in teleportation, an unknown polarization state of single photons is teleported onto and stored in a remote atomic qubit via a Bell-state measurement between the photon to be teleported and the photon that is originally entangled with the atomic qubit. The protocol has ...

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“…But today we see a growing number of remarkable experiments mastering entanglement. Entanglement over long distances [11,12,13,19,33], entanglement between many photons [34] and many ions [35], entanglement of an ion and a photon [36,37], entanglement of mesoscopic systems (more precisely entanglement between a few collective modes carried by many particles) [38,39,40], entanglement swapping [41,42,43], the transfer of entanglement between different carriers [44], etc.…”

Section: Entanglement As a Cause Of Correlationmentioning

confidence: 99%

Can Relativity be Considered Complete? From Newtonian Nonlocality to Quantum Nonlocality and Beyond

Gisin

2015

Lecture Notes in Physics

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We review the long history of nonlocality in physics with special emphasis on the conceptual breakthroughs over the last few years. For the first time it is possible to study "nonlocality without signaling" from the outside, that is without all the quantum physics Hilbert space artillery. We emphasize that physics has always given a nonlocal description of Nature, except during a short 10 years gap. We note that the very concept of "nonlocality without signaling" is totally foreign to the spirit of relativity, the only strictly local theory.

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Experimental demonstration of five-photon entanglement and open-destination teleportation

Cited by 591 publications

References 31 publications

Nonseparable Werner states in spontaneous parametric down-conversion

Nonseparable Werner states in spontaneous parametric down-conversion

Memory-built-in quantum teleportation with photonic and atomic qubits

Can Relativity be Considered Complete? From Newtonian Nonlocality to Quantum Nonlocality and Beyond

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