Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 39: Posters: Quantum Optics and Photonics III
Q 39.46: Poster
Wednesday, March 11, 2020, 16:30–18:30, Empore Lichthof
Towards quantum teleportation in space and frequency using a comb of squeezed vacuum — •Dennis Wilken1,2,3, Jonas Junker1,2,3, and Michèle Heurs1,2,3,4 — 1Leibniz Universität Hannover, Institut für Gravitationsphysik, Deutschland — 2Max Planck Institut für Gravitationsphysik, Deutschland — 3QuantumFrontiers — 4PhoenixD
Sources of squeezed vacuum are now routinely implemented in gravitational wave detectors. These so-called "squeezers" are based on a parametric down-conversion process generating pairs of entangled photons at frequencies ± Ω with respect to the laser frequency. We intend to use this entanglement by frequency-dependently separating these photons using an unbalanced Mach-Zehnder interferometer or detuned cavities. We are designing different experiments, such as a measurement-induced entanglement and entanglement swapping, to demonstrate quantum teleportation in space and frequency. This could enable frequency multiplexing in continuous variable quantum communication.
We have set up an optical parametric oscillator cavity that runs below threshold to generate squeezed states of vacuum. It has a comparably high roundtrip length of 1.5 m to generate a squeezing comb with a "teeth separation" of only 200 MHz. We were able to generate and stably lock 9 dB of squeezing. We have developed a low-noise and high-speed homodyne-detector that provides more than 10 dB of clearance between shot noise and electronic noise up to 3 GHz. We will present the current status of the experiment and the next steps.