Deterministic quantum teleportation between distant atomic objects

Krauter, Hanna; Salart, D.; Muschik, Christine A.; Petersen, Jonas M.; Shen, Heng; Fernholz, T.; Polzik, E. S.

doi:10.1038/nphys2631

Cited by 190 publications

(153 citation statements)

References 26 publications

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“…This stands as one of the pillars of a networked system, along with storage and processing. In the past two decades there has been significant experimental progress in the field of teleportation, on a variety of different systems [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. An important class of these are continuous-variable systems, which range from atomic ensembles to optical modes and beyond [24,25].…”

Section: Introductionmentioning

confidence: 99%

Continuous-variable versus hybrid schemes for quantum teleportation of Gaussian states

2014

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In this paper, we examine and compare two fundamentally different teleportation schemes: the well-known continuous-variable scheme of Vaidman, Braunstein, and Kimble (VBK) and a recently proposed hybrid scheme by Andersen and Ralph (AR). We analyze the teleportation of ensembles of arbitrary pure single-mode Gaussian states using these schemes and see how they fare against the optimal measure-and-prepare strategies-the benchmarks. In the VBK case, we allow for nonunit gain tuning and additionally consider a class of non-Gaussian resources in order to optimize performance. The results suggest that the AR scheme may likely be a more suitable candidate for beating the benchmarks in the teleportation of squeezing, capable of achieving this for moderate resources in comparison to the VBK scheme. Moreover, our quantification of resources, whereby different protocols are compared at fixed values of the entanglement entropy or the mean energy of the resource states, brings into question any advantage due to non-Gaussianity for quantum teleportation of Gaussian states.

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Section: Introductionmentioning

confidence: 99%

Continuous-variable versus hybrid schemes for quantum teleportation of Gaussian states

2014

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“…Therefore, to ensure that each qubit state inserted into the teleporter unconditionally re-appears on Bob's side, Alice must be able to distinguish between all four Bell states in a single shot and Bob has to preserve the coherence of the target qubit during the communication of the outcome and the final conditional transformation. Several pioneering experiments have explored teleportation between remote nodes [12][13][14] but unconditional teleportation between long-lived qubits [1][2][3] has so far only been demonstrated within a local qubit register [15][16][17].…”

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confidence: 99%

Unconditional quantum teleportation between distant solid-state quantum bits

Pfaff

Hensen

Bernien

et al. 2014

Science

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Realizing robust quantum information transfer between long-lived qubit registers is a key challenge for quantum information science and technology. Here we demonstrate unconditional teleportation of arbitrary quantum states between diamond spin qubits separated by 3 meters. We prepare the teleporter through photon-mediated heralded entanglement between two distant electron spins and subsequently encode the source qubit in a single nuclear spin. By realizing a fully deterministic Bell-state measurement combined with real-time feed-forward we achieve teleportation in each attempt while obtaining an average state fidelity exceeding the classical limit. These results establish diamond spin qubits as a prime candidate for the realization of quantum networks for quantum communication and network-based quantum computing.The reliable transmission of quantum states between remote locations is a major open challenge in quantum science today. Quantum state transfer between nodes containing long-lived qubits [1][2][3] can extend quantum key distribution to long distances [4], enable blind quantum computing in the cloud [5] and serve as a critical primitive for a future quantum network [6]. When provided with a single copy of an unknown quantum state, directly sending the state in a carrier such as a photon is unreliable due to inevitable losses. Creating and sending several copies of the state to counteract such transmission losses is impossible by the no-cloning theorem [7]. Nevertheless, quantum information can be faithfully transmitted over arbitrary distances through quantum teleportation provided the network parties (named "Alice" and "Bob") have previously established a shared entangled state and can communicate classically [8][9][10][11].The teleportation protocol is sketched in Fig. 1A. At the start, Alice is in possession of the state to be teleported (qubit 1) which is most generally given by |ψ = α|0 + β|1 . Alice and Bob each have one qubit of an entangled pair (qubits 2 and 3) in the joint state |ΨThe combined state of all three qubits can be rewritten aswhere |Φ ± = (|00 ± |11 )/ √ 2 and |Ψ ± = (|01 ± |10 )/ √ 2 are the four Bell states. To teleport the quantum state Alice performs a joint measurement on her * Present address: Department of Applied Physics, Yale University, New Haven, CT 06511, USA † r.hanson@tudelft.nl qubits (qubits 1 and 2) in the Bell basis, projecting Bob's qubit into a state that is equal to |ψ up to a unitary operation that depends on the outcome of Alice's measurement. Alice sends the outcome via a classical communication channel to Bob, who can then recover the original state by applying the corresponding local transformation.Because the source qubit state always disappears on Alice's side, it is irrevocably lost whenever the protocol fails. Therefore, to ensure that each qubit state inserted into the teleporter unconditionally re-appears on Bob's side, Alice must be able to distinguish between all four Bell states in a single shot and Bob has to preserve the coherence of the target q...

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“…Over the last decade, both probabilistic/heralded 1,5-8 and deterministic teleportation [9][10][11][12][13] have been demonstrated in various quantum systems. The realization of quantum teleportation between a propagating photon and a single semiconductor spin that we describe in this paper closely builds on prior demonstrations of photon-stationary qubit interfaces in collective atomic excitations in atomic vapours 14,15 and in doped crystals 16,17 , as well as in single trapped atoms 18,19 .…”

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confidence: 99%

Quantum teleportation from a propagating photon to a solid-state spin qubit

et al. 2013

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A quantum interface between a propagating photon used to transmit quantum information and a long-lived qubit used for storage is of central interest in quantum information science. A method for implementing such an interface between dissimilar qubits is quantum teleportation. Here we experimentally demonstrate transfer of quantum information carried by a photon to a semiconductor spin using quantum teleportation. In our experiment, a single photon in a superposition state is generated using resonant excitation of a neutral dot. To teleport this photonic qubit, we generate an entangled spin-photon state in a second dot located 5 m away and interfere the photons from the two dots in a Hong-Ou-Mandel set-up. Thanks to an unprecedented degree of photon-indistinguishability, a coincidence detection at the output of the interferometer heralds successful teleportation, which we verify by measuring the resulting spin state after prolonging its coherence time by optical spin-echo.

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Deterministic quantum teleportation between distant atomic objects

Cited by 190 publications

References 26 publications

Continuous-variable versus hybrid schemes for quantum teleportation of Gaussian states

Continuous-variable versus hybrid schemes for quantum teleportation of Gaussian states

Unconditional quantum teleportation between distant solid-state quantum bits

Quantum teleportation from a propagating photon to a solid-state spin qubit

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