Quantum teleportation is an essential capability for quantum networks, allowing the transmission of bits (qubits) without a direct exchange information. Its implementation between distant parties requires information to matter qubits that store it long enough allow users perform further processing. Here we demonstrate distance from photonic qubit at telecom wavelength qubit, stored as collective excitation in solid-state memory. Our system encompasses active feed-forward scheme, implementing...

Entanglement between photons at telecommunication wavelengths and long-lived quantum memories is one of the fundamental requirements long-distance communication. Quantum featuring on-demand readout multimode operation are additional precious assets that will benefit communication rate. In this Letter, we report first demonstration entanglement a telecom photon collective spin excitation in solid-state memory. Photon pairs generated through widely nondegenerate parametric down-conversion,...

Ensemble-based quantum memories are key to developing multiplexed repeaters, able overcome the intrinsic rate limitation imposed by finite communication times over long distances. Rare-earth ion doped crystals main candidates for highly multimode memories, where time, frequency and spatial multiplexing can be exploited store multiple modes. In this context atomic comb (AFC) memory provides large temporal capacity, which readily combined with in space. article, we derive theoretical formulas...

The deployment of a full-fledged quantum internet poses the challenge finding adequate building blocks for entanglement distribution between remote nodes. A practical system would combine propagation in optical fibers with memories light, leveraging on existing communication network while featuring scalability required to extend sizes. Here, we demonstrate fiber-integrated memory entangled photon at telecommunication wavelength. storage device is based fiber-pigtailed laser-written waveguide...

Spins in solids are an ideal candidate to act as a memory and interface with superconducting qubits due their long coherence times. We spectroscopically investigate erbium-167-doped yttrium orthosilicate possible microwave-addressed employing its microwave frequency transitions that occur without applying external magnetic field. obtain times of 380 $\mu$s ground state spin transition 1.48 ms excited transition. This is 28 longer compared previous zero field measurements, well 200 than...

UV/visible spectroscopy is the method of choice for RNA quantification, thanks to its simplicity and accuracy. However, it cannot be used quantify in lipid nanoparticles (LNPs), such as those drug delivery mRNA vaccines, because light scattering by LNPs. Alternative methods RiboGreen fluorescence assay require much more sample preparation lack reproducibility Here we propose demonstrate an alternative approach using integrating sphere setup measure scatter-free absorption spectra. spectra...

We show that crystal-field calculations for ${C}_{1}$ point-group symmetry are possible, and such can be performed with sufficient accuracy to have substantial utility rare-earth based quantum information applications. In particular, we perform fitting a ${C}_{1}$-symmetry site in ${^{167}\mathrm{Er}}^{3+}:{\mathrm{Y}}_{2}{\mathrm{SiO}}_{5}$. The calculation simultaneously includes site-selective spectroscopic data up $20\text{ }000\text{ }\text{ }{\mathrm{cm}}^{\ensuremath{-}1}$, rotational...

We report on the transmission of telecom photons entangled with a multimode solid-state quantum memory over deployed optical fiber in metropolitan area. Photon pairs were generated through spontaneous parametric downconversion, one photon stored rare-earth-based memory, and other, at telecommunication wavelengths, traveling increasing distances fiber, first laboratory then outside loop. measured highly non-classical correlations between for storage times up to 25 µs separation 50 km. also...

The hyperfine structure of the ground state erbium-doped yttrium orthosilicate is analyzed with use electron paramagnetic resonance experiments in a tunable microwave resonator. This work was prompted by disagreement between recent measurement made at zero magnetic field and previously published spin Hamiltonian. ability to vary strength, resonator frequency, orientation our sample enabled us monitor how frequencies transitions change as function vector field. We arrived different set...

Integrated photonics offers compact and stable manipulation of optical signals in miniaturized chips, with the possibility changing dynamically their functionality by means integrated phase shifters. Cryogenic operation these devices is becoming essential for advancing photonic quantum technologies, accommodating components like light sources, single photon detectors memories operating at liquid helium temperatures. In this work, we report on a programmable glass circuit (PIC) fabricated...

Abstract Integrated photonics offers compact and stable manipulation of optical signals in miniaturized chips, with the possibility changing dynamically their functionality by means integrated phase shifters. Cryogenic operation these devices is becoming essential for advancing photonic quantum technologies, accommodating components like light sources, single photon detectors memories operating at liquid helium temperatures. In this work, we report on a programmable glass circuit (PIC)...

Magnetically induced current densities in the lowest lying singlet and triplet states of a series phenylene molecules were examined at B3LYP/lanl2DZ level theory. Previous findings have shown that ground state, phenylenes exhibit ring currents with opposed tropicity: diatropic within six-membered rings paratropic four-membered rings. However, for biphenylene first excited there is drastic change aromaticity comparison to state. Specifically, this molecule state sustains strong global...

We report on the transmission of telecom photons entangled with a multimode solid-state quantum memory over deployed optical fiber in metropolitan area. Photon pairs were generated through spontaneous parametric down-conversion, one photon stored rare earth-based memory, and other, at telecommunication wavelengths, traveling increasing distances fibre, first laboratory then outside fibre loop. measured highly-non-classical correlations between for storage times up to 25 $\mu$s separation 50...

We demonstrate long-distance quantum teleportation from a telecom photonic time-bin qubit to solid-state memory. The storage time of the memory allows for active feedforward, therefore completing protocol.

We report entanglement between a multimode quantum memory and photon, after propagation in metropolitan fiber links. The detection setup is then placed remote location signals are sent back through fibers.

As the reach of quantum technologies extends ever further in communication and information science, a reliable way transferring between distant locations becomes more crucial. While photons are widely accepted as excellent carriers due to their speed low decoherence, losses transmission (in free space or fibre) impossibility cloning still pose great challenge. The repeater architecture was suggested solution both problems [1]. In encoded an input state is transferred new one through...

We demonstrate the storage of light-matter entanglement between a telecom photon and an integrated solid-state quantum memory. The memory is fibre-coupled waveguide written in rare-earth doped crystal.

We demonstrate entanglement between a telecom photon and solid-state multimode quantum memory. The is maintained for an optical excitation (with fidelity high enough to violate Bell inequality) spin-wave excitation.