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arXiv:quant-ph/0204158 · Physical Review A

Active teleportation of a quantum bit

Sandro Giacomini, Fabio Sciarrino, Egilberto Lombardi, F. De Martini

Published Sep 20, 2002• 76 citations
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Abstract

We report the experimental realization of the ``active'' quantum teleportation (QST) of a one-particle entangled qubit. This demonstration completes the original QST protocol and renders it available for actual implementation in quantum computation networks. It is accomplished by implementing an 8 m optical delay line and a single-photon triggered fast electro-optic Pockels cell. A large value of teleportation ``fidelity'' was attained: ${F}_{a}=(90\ensuremath{\mp}2)%.$ Our work follows the line recently suggested by H. W. Lee and J. Kim [Phys. Rev. A $63,$ 012305 (2000)] and E. Knill, R. Laflamme, and G. Milburn [Nature (London) $409,$ 46 (2001)].

DOI
10.1103/physreva.66.030302

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We report the experimental realization of the active'' quantum teleportation (QST) of a one-particle entangled qubit. This demonstration completes the original QST protocol and renders it available for actual implementation in quantum computation networks. It is accomplished by implementing an 8 m optical delay line and a single-photon triggered fast electro-optic Pockels cell. A large value of teleportation fidelity'' was attained: Fa=(90\ensuremath∓2){F}_{a}=(90\ensuremath{\mp}2)%.Fa​=(90\ensuremath∓2) Our work follows the line recently suggested by H. W. Lee and J. Kim [Phys. Rev. A 63,63,63, 012305 (2000)] and E. Knill, R. Laflamme, and G. Milburn [Nature (London) 409,409,409, 46 (2001)].
Abstract We report the experimental realization of the “active” quantum teleportation (QST) of a one‐particle entangled qubit. The qubit is physically implemented by a two‐dimensional subspace of states of a mode of the electromagnetic field, specifically, the space spanned by the vacuum and the one photon state. This demonstration completes the original QST protocol and renders it available for actual implementation in quantum computation networks. It is accomplished by implementing a 8 m optical delay line and a single‐photon triggered fast Electro‐Optic Pockels cell. A large value of teleportation “fidelity” was attained: Fa = 90 ∓ 2)%. Furthermore we present a scheme for delayed‐entanglement swapping by applying the same quantum optical method.
We report the experimental realization of teleporting a one-particle entangled qubit. The qubit is physically implemented by a two-dimensional subspace of states of a mode of the electromagnetic field, specifically, the space spanned by the vacuum and the one-photon state. Our experiment follows the line suggested by Lee and Kim [Phys. Rev. A 63, 012305 (2000)] and Knill, Laflamme, and Milburn [Nature (London) 409, 46 (2001)]. An unprecedented large value of the teleportation "fidelity" has been attained: F = (95.3 +/- 0.6)%.
We report the experimental demonstration of a quantum teleportation protocol with a semiconductor single photon source. Two qubits, a target and an ancilla, each defined by a single photon occupying two optical modes (dual-rail qubit), were generated independently by the single photon source. Upon measurement of two modes from different qubits and postselection, the state of the two remaining modes was found to reproduce the state of the target qubit. In particular, the coherence between the target qubit modes was transferred to the output modes to a large extent. The observed fidelity is 80%, in agreement with the residual distinguishability between consecutive photons from the source. An improved version of this teleportation scheme using more ancillas is the building block of the recent Knill, Laflamme, and Milburn proposal for efficient linear optics quantum computation.
In recent years, there has been heightened interest in quantum teleportation, which allows for the transfer of unknown quantum states over arbitrary distances. Quantum teleportation not only serves as an essential ingredient in long-distance quantum communication, but also provides enabling technologies for practical quantum computation. Of particular interest is the scheme proposed by D. Gottesman and I. L. Chuang [(1999) Nature 402:390-393], showing that quantum gates can be implemented by teleporting qubits with the help of some special entangled states. Therefore, the construction of a quantum computer can be simply based on some multiparticle entangled states, Bell-state measurements, and single-qubit operations. The feasibility of this scheme relaxes experimental constraints on realizing universal quantum computation. Using two different methods, we demonstrate the smallest nontrivial module in such a scheme--a teleportation-based quantum entangling gate for two different photonic qubits. One uses a high-fidelity six-photon interferometer to realize controlled-NOT gates, and the other uses four-photon hyperentanglement to realize controlled-Phase gates. The results clearly demonstrate the working principles and the entangling capability of the gates. Our experiment represents an important step toward the realization of practical quantum computers and could lead to many further applications in linear optics quantum information processing.
Faithful long-distance quantum teleportation necessitates prior entanglement distribution between two communicated locations. The particle carrying on the unknown quantum information is then combined with one particle of the entangled states for Bell-state measurements, which leads to a transfer of the original quantum information onto the other particle of the entangled states. However in most of the implemented teleportation experiments nowadays, the Bell-state measurements are performed even before successful distribution of entanglement. This leads to an instant collapse of the quantum state for the transmitted particle, which is actually a single-particle transmission thereafter. Thus the true distance for quantum teleportation is, in fact, only in a level of meters. In the present experiment we design a novel scheme which has overcome this limit by utilizing fiber as quantum memory. A complete quantum teleportation is achieved upon successful entanglement distribution over 967 meters in public free space. Active feed-forward control techniques are developed for real-time transfer of quantum information. The overall experimental fidelities for teleported states are better than 89.6%, which signify high-quality teleportation.