Two-photon interference of weak coherent laser pulses recalled from separate solid-state quantum memories

Jeongwan Jin, Joshua A. Slater, Erhan Saglamyurek, Neil Sinclair, Mathew George, Raimund Ricken, Daniel Oblak, Wolfgang Sohler and Wolfgang Tittel ()
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Jeongwan Jin: Institute for Quantum Science and Technology, University of Calgary
Joshua A. Slater: Institute for Quantum Science and Technology, University of Calgary
Erhan Saglamyurek: Institute for Quantum Science and Technology, University of Calgary
Neil Sinclair: Institute for Quantum Science and Technology, University of Calgary
Mathew George: University of Paderborn
Raimund Ricken: University of Paderborn
Daniel Oblak: Institute for Quantum Science and Technology, University of Calgary
Wolfgang Sohler: University of Paderborn
Wolfgang Tittel: Institute for Quantum Science and Technology, University of Calgary

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Quantum memories allowing reversible transfer of quantum states between light and matter are central to quantum repeaters, quantum networks and linear optics quantum computing. Significant progress regarding the faithful transfer of quantum information has been reported in recent years. However, none of these demonstrations confirm that the re-emitted photons remain suitable for two-photon interference measurements, such as C-NOT gates and Bell-state measurements, which constitute another key ingredient for all aforementioned applications. Here, using pairs of laser pulses at the single-photon level, we demonstrate two-photon interference and Bell-state measurements after either none, one or both pulses have been reversibly mapped to separate thulium-doped lithium niobate waveguides. As the interference is always near the theoretical maximum, we conclude that our solid-state quantum memories, in addition to faithfully mapping quantum information, also preserve the entire photonic wavefunction. Hence, our memories are generally suitable for future applications of quantum information processing that require two-photon interference.

Date: 2013
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DOI: 10.1038/ncomms3386

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