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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Putting a spin on Photons

Jörg Wrachtrup

Published Jun 1, 2017• 0 citations
Publisher

Abstract

Summary form only given. The efficient conversion of photons into matter degrees of freedom is a hallmark of almost all quantum technology. Quantum communication for example relies on storing, retrieval as well as processing of photonic quantum information in matter qubits and quantum sensing is greatly facilitated by converting quantum signals into photon states. The talk will describe a novel matter-photon interface based on defects in solids. Efficient spin to photon conversion and multimode optical storage as well as processing will be described. Quite intriguingly, the same spin-photon interfaces can be used for novel quantum sensors converting e.g. magnetic and electric fields or even force into photonics signals with unprecedented sensitivity.

DOI
10.1109/cleoe-eqec.2017.8087853

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Summary form only given. The efficient conversion of photons into matter degrees of freedom is a hallmark of almost all quantum technology. Quantum communication for example relies on storing, retrieval as well as processing of photonic quantum information in matter qubits and quantum sensing is greatly facilitated by converting quantum signals into photon states. The talk will describe a novel matter-photon interface based on defects in solids. Efficient spin to photon conversion and multimode optical storage as well as processing will be described. Quite intriguingly, the same spin-photon interfaces can be used for novel quantum sensors converting e.g. magnetic and electric fields or even force into photonics signals with unprecedented sensitivity.
We report on an experiment demonstrating storage of single-photonlevel light pulses at telecommunication wavelength by frequency up-converting them to the visible range to be resonant with a solid-state optical memory based on a Pr:Y2SiO5 crystal. We convert the telecom photons at 1570 nm to 606 nm using a periodically-poled potassium titanyl phosphate nonlinear waveguide. The maximum device efficiency is inferred to be η dev = 22±1% with a signal to noise ratio exceeding 1 for single-photon-level pulses with durations of up to 560 ns. The converted light is then stored in the crystal using the atomic frequency comb scheme with storage and retrieval efficiencies exceeding ηAFC = 20% for predetermined storage times of up to 5μs. The retrieved light is time delayed from the noisy conversion process allowing us to measure a signal to noise ratio exceeding 100 with telecom single-photon-level inputs. These results represent the first demonstration of single-photon-level optical storage interfaced with frequency up-conversion. PACS numbers: 03.67.Hk,42.50.Gy,42.50.Md,42.65.Wi
We report on an experiment that demonstrates the frequency up-conversion of telecommunication wavelength single-photon-level pulses to be resonant with a : crystal. We convert the telecom photons at to using a periodically-poled potassium titanyl phosphate nonlinear waveguide. The maximum device efficiency (which includes all optical loss) is inferred to be (internal efficiency ) with a signal to noise ratio exceeding 1 for single-photon-level pulses with durations of up to 560 ns. The converted light is then stored in the crystal using the atomic frequency comb scheme with storage and retrieval efficiencies exceeding for predetermined storage times of up to . The retrieved light is time delayed from the noisy conversion process allowing us to measure a signal to noise ratio exceeding 100 with telecom single-photon-level inputs. These results represent the first demonstration of single-photon-level optical storage interfaced with frequency up-conversion.
Spin defects in wide band gap semiconductors are a leading contender in various areas of quantum technology. Most notably they have been established as a novel tool for nanoscale sensing and as major hardware for long distance quantum entanglement, necessary for quantum repeater structures [1],[2]. I will present the use of spin defects in Silicon Carbide (SiC) for quantum photonics and specifically for spin-photon interfaces [3]. Specifically, I will address the spin properties of the material and the interplay between photon emission and spin memory times. It turns out, that the silicon vacancy in SiC is an excellent compromise between photonic and spin quantum memory properties [4]. Even when incorporated into microscale photonic waveguides the optical transitions retain high quality such that long spin coherence times and almost transform-limited photon emission can be observed simultaneously.
We report on an experiment that demonstrates the frequency up-conversion of telecommunication wavelength single-photon-level pulses to be resonant with a Pr3+\mathrm{Pr}^{3+}Pr3+:Y2SiO5\mathrm{Y}_2\mathrm{Si}\mathrm{O}_5Y2​SiO5​ crystal. We convert the telecom photons at 1570 nm1570\,\mathrm{nm}1570nm to 606 nm606\,\mathrm{nm}606nm using a periodically-poled potassium titanyl phosphate nonlinear waveguide. The maximum device efficiency (which includes all optical loss) is inferred to be ηdevmax=22±1 η_{\mathrm{dev}}^{\mathrm{max}} = 22 \pm 1\,%ηdevmax​=22±1 (internal efficiency ηint=75±8 η_{\mathrm{int}} = 75\pm8\,%ηint​=75±8) with a signal to noise ratio exceeding 1 for single-photon-level pulses with durations of up to 560 \,ns. The converted light is then stored in the crystal using the atomic frequency comb scheme with storage and retrieval efficiencies exceeding ηAFC=20 η_{\mathrm{AFC}} = 20\,%ηAFC​=20 for predetermined storage times of up to 5 μs5\,μ\mathrm{s}5μs. The retrieved light is time delayed from the noisy conversion process allowing us to measure a signal to noise ratio exceeding 100 with telecom single-photon-level inputs. These results represent the first demonstration of single-photon-level optical storage interfaced with frequency up-conversion.