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We underscore interaction process steps behind registering data for a quantum effect, leading to differentiate the measurable Superposition Effect from the un-measurable Superposition Principle. Extracting quantum information out of photoelectric data needs revisiting.
We present a bulk-optics setup for discrete quantum walks, based on a novel multipass displaced Sagnac geometry. It is phase stable, reconfigurable and allows to meausure the output radiation at each step. The experimental results of both ordered and disordered one-particle evolutions are reported.
We develop single-photon sources that simultaneously combines high purity, efficiency, and indistinguishability. We demonstrate entanglement among 12 single photons. We construct high-performance multi-photon boson sampling machines to race against classical computers.
Gain-switched III–V on silicon waveguide integrated lasers are used to generate weak-coherent pulses compatible with high rate Quantum Key Distribution (QKD) and, by exhibiting Hong-Ou-Mandel interference with 46 ± 2% visibility, suitable for Measurement-Device-Independent-QKD.
By trapping cold atoms in the evanescent field of an optical nanofiber, we store and reflect guided pulses at the single-photon level. We also herald, store and read out a single waveguide-coupled collective atomic excitation.
We study ancilla-assisted schemes for estimating multiple optical loss parameters under energy constraints and derive an optimal class of probe states and quantum measurements. Probes and measurements realizable using current technology are also presented.
From long-term frequency comparisons of our two 171Yb+ single-ion optical frequency standards with a millihertz uncertainty we improve previous limits for violations of Local Lorentz Invariance by two orders of magnitude. In addition, recent improvement in the clock performance will be discussed and our contribution to the opticlock project that will be a robust, high-availability and easy-to-use optical clock, which can be operated outside of specialized laboratories.
Quantum communication relies on the transmission of photons across lossy channels. Here, we show how hyperentangled photons can improve the efficiency of generating high fidelity entangled pairs between two parties.
Quantum networks are typically made of identical subsystems. Exploiting indistinguishability as a direct quantum resource would thus be highly desirable. We show this is achievable by spatially localized measurements, enabling teleportation and entanglement swapping protocols.
In this work, EPR-states are generated from a single squeezing source by temporal multiplexing using optical switching and delay. With switching and delay being key components, we demonstrate a platform suitable for scalable quantum computation.
We compensate for scattering of pairs of spatially entangled photons from a dynamic diffuser, by tailoring the wavefront of the pump beam which generates the photon-pairs in a spontaneous parametric down conversion process.
We demonstrate a frequency-comb single-photon interferometry for quantum spectroscopy and imaging with undetected photons by utilizing both of optical frequency comb technique and quantum erasing mechanism with path-entangled photon pairs.
We present sensitivity limits for a multimode interferometer as matrix bounds for the covariance matrix. Quantum strategies to improve the precision beyond classical limits may consist in entanglement among the modes or among the particles.
Integrated universal linear optical networks are essential for the development of quantum information processing (QIP). We demonstrate a universal, reconfigurable, 8×8 photonic processor based on Si3N4 waveguides showing a variety of QIP primitives.
In interferometric displacement and force measurement, the tradeoff between imprecision noise and quantum backaction sets the standard quantum limit (SQL). By exploiting quantum correlations in an optomechanical system, we demonstrate the first sub-SQL interferometric measurement.
The dynamics of tripartite systems of field-atom interactions and optome-chanics is investigated through relevant tomograms. Quadrature and tomographic entropic squeezing and entanglement properties are examined . Entanglement collapses to constant nonzero values over significant time intervals.
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text T. M. Hird, S. E. Thomas, J. H. D. Munns, B. Brecht, D. J. Saunders, J. Nunn, I. A. Walmsley, and P. M. Ledingham, "Noise Suppression via Atomic Absorption in a Raman Quantum Memory," in Quantum Information and Measurement (QIM) V: Quantum Technologies, OSA Technical Digest (Optica Publishing Group, 2019), paper T5A.76. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
Here we demonstrate a spin-wave storage realized in 171Yb3+:Y2SiO5 crystal, with storage times beyond 1 ms thanks to the simultaneous clock condition for optical and microwave transitions. These results represent a step towards realizing a long-lived, broadband and multimode solid-state quantum memory.
We report on a quantum-based measurement of index difference for fiber laser applications. Based on an interferometric setup, we demonstrate a state-of-the-art high-accurate measurement of ∆n = (1,67 ± 0,07) · 10−4 thanks exploitation of peculiar properties of quantum photonics.
