Quantum teleportation across the Danube

Ursin, Rupert; Jennewein, Thomas; Aspelmeyer, Markus; Kaltenbaek, Rainer; Lindenthal, M.; Walther, Philip; Zeilinger, Anton

doi:10.1038/430849a

Cited by 311 publications

(199 citation statements)

References 11 publications

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“…Starting in 1997, teleportation with photonic qubits has been demonstrated repeatedly in various laboratories (see e.g. [47][48][49][50][51][52][53]) and recently even outside the laboratory [54,55].…”

Section: Some Quantum Communication Toolsmentioning

confidence: 99%

Photon‐echo quantum memory in solid state systems

Tittel¹,

Afzelius

Chanelière

et al. 2010

Laser & Photonics Reviews

429

418

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Many applications of quantum communication crucially depend on reversible transfer of quantum states between light and matter. Motivated by rapid recent developments in theory and experiment, we review research related to quantum memory based on a photon-echo approach in solid state material with emphasis on use in a quantum repeater. After introducing quantum communication, the quantum repeater concept, and properties of a quantum memory required to be useful in a quantum repeater, we describe the historical development from spin echoes, discovered in 1950, to photon-echo quantum memory. We present a simple theoretical description of the ideal protocol, and comment on the impact of a non-ideal realization on its quantum nature. We extensively discuss rare-earth-ion doped crystals and glasses as material candidates, elaborate on traditional photon-echo experiments as a test-bed for quantum state storage, and describe the current state-of-the-art of photon-echo quantum memory. Finally, we give a brief outlook on current research.The picture shows a Europium doped Y2SiO5 crystal surrounded by electrodes in the setup used for the first proof-of-principle demonstration of the novel, photon-echo based quantum memory protocol.

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Section: Some Quantum Communication Toolsmentioning

confidence: 99%

Photon‐echo quantum memory in solid state systems

Tittel¹,

Afzelius

Chanelière

et al. 2010

Laser & Photonics Reviews

429

418

View full text Add to dashboard Cite

show abstract

“…Unfortunately, with only linear optical elements, a complete Bell-state analysis (BSA) is impossible and one can only get the optimal success probability of 1 2 [9][10][11]. In the optimal optical BSA scheme realized experimentally, its success probability is only 50% [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Complete hyperentangled-Bell-state analysis for quantum communication

2010

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It is impossible to unambiguously distinguish the four Bell states in polarization, resorting to linear optical elements only. Recently, the hyperentangled Bell state, the simultaneous entanglement in more than one degree of freedom, has been used to assist in the complete Bell-state analysis of the four Bell states. However, if the additional degree of freedom is qubitlike, one can only distinguish 7 from the group of 16 states. Here we present a way to distinguish the hyperentangled Bell states completely with the help of cross-Kerr nonlinearity. Also, we discuss its application in the quantum teleportation of a particle in an unknown state in two different degrees of freedom and in the entanglement swapping of hyperentangled states. These applications will increase the channel capacity of long-distance quantum communication.

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“…It also serves as an elementary operation in quantum computers and in a number of quantum communication protocols. It has been achieved experimentally in different quantum systems [3,4,5] and over long distances, inside [6] and outside [7] laboratory conditions. Quantum teleportation is a technique for transfer of information between parties, using a distributed entangled state and a classical communication channel [8].…”

Section: Introductionmentioning

confidence: 99%

Perfect teleportation, quantum-state sharing, and superdense coding through a genuinely entangled five-qubit state

Muralidharan¹,

2008

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We investigate the usefulness of a recently introduced five qubit state by Brown et al .[1] for quantum teleportation, quantum state sharing and superdense coding. It is shown that this state can be utilized for perfect teleportation of arbitrary single and two qubit systems. We devise various schemes for quantum state sharing of an arbitrary single and two particle state via cooperative teleportation. We later show that this state can be used for superdense coding as well. It is found that five classical bits can be sent by sending only three quantum bits.

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Quantum teleportation across the Danube

Cited by 311 publications

References 11 publications

Photon‐echo quantum memory in solid state systems

Photon‐echo quantum memory in solid state systems

Complete hyperentangled-Bell-state analysis for quantum communication

Perfect teleportation, quantum-state sharing, and superdense coding through a genuinely entangled five-qubit state

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