We demonstrate teleportation of quantum bits between two single atoms in distant laboratories. Using a time-resolved photonic Bell-state measurement, we achieve fidelity (88.0+/-1.5)%, largely determined by our entanglement fidelity. The low photon collection efficiency free space is overcome trapping each atom an optical cavity. resulting success probability 0.1% almost 5 orders magnitude larger than previous experiments with remote material qubits. It mainly limited propagation and...

A single neutral atom is trapped in a three-dimensional optical lattice at the center of high-finesse resonator. Using fluorescence imaging and shiftable standing-wave trap, deterministically loaded into maximum intracavity field where atom-cavity coupling strong. After 5 ms Raman sideband cooling, motional ground state populated with probability (89±2)%. Our system first to simultaneously achieve quantum control over all degrees freedom atom: its position momentum, internal state, light.

We present hybrid-integrated extended cavity diode lasers tunable around 637 nm, with a gain-wide spectral coverage of 8 nm. This tuning range addresses the zero-phonon line nitrogen-vacancy centers and includes wavelength HeNe (633 nm). Best performance shows wide mode-hop free up to 97 GHz narrow intrinsic linewidth down 10 kHz. Also, maximum output power is 2.5 mW in single-mode fiber, corresponding an on-chip 4.0 mW. Full integration packaging standard housing fiber pigtails provide high...

A single rubidium atom trapped within a high-finesse optical cavity is an efficient source of photons. We theoretically and experimentally study single-photon generation using vacuum stimulated Raman adiabatic passage. achieve photon efficiencies up to 34% 56% on the D1 D2 line, respectively. Output coupling with 89% results in record-high for photons one spatiotemporally well-defined propagating mode. demonstrate that observed are constant wide range applied pump laser powers virtual level...

An optical quantum memory is a stationary device that capable of storing and recreating photonic qubits with higher fidelity than any classical device. Thus far, these two requirements have been fulfilled for polarization in systems based on cold atoms cryogenically cooled crystals. Here, we report room-temperature arbitrary signal-to-background ratio 1 an average surpassing the benchmark weak laser pulses containing 1.6 photons average, without taking into account non-unitary operation. Our...

Hybrid integrated diode lasers based on combining semiconductor optical amplifiers with low-loss Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> -based feedback circuits enable great laser performance for advanced photonic circuits. In particular, using high-Q ring resonators frequency-selective provides wide spectral coverage, mode-hop free tuning, and high frequency stability...

We present two distinct ultra-low frequency noise lasers at 729 nm with a fast of 30 Hz 2 /Hz, corresponding to Lorentzian linewidth 0.1 kHz. The characteristics both lasers, which are based on different types laser diodes, investigated using experimental and theoretical analysis focus identifying the advantages disadvantages each type system. Specifically, we study differences similarities in mode behavior while tuning reduction. Furthermore, demonstrate locking capability these systems...

We show the implementation of most fundamental quantum memory by mapping arbitrary polarization states light into and out a single atom trapped inside an optical cavity. The performance is analyzed through full process tomography. average fidelity measured to be 93% low decoherence rates result in storage times exceeding 180µs.

We present a hybrid-integrated extended cavity diode laser tunable around 637 mn, with total tuning range of 8 nm, allowing to address the zero-phonon line nitrogen vacancy centers. The provides wide mode-hop free over 43.6 GHz and narrow intrinsic linewidth below 10 kHz. maximum output power is 2.5 mW in single-mode fiber, corresponding an on-chip 4.0 mW. assembled standard housing fiber-pigtailed.

Hybrid integrated diode lasers based on combining semiconductor optical amplifiers with low-loss Si3N4-based feedback circuits enable great laser performance for advanced photonic circuits. In particular, using high-Q Si3N4 ring resonators frequency-selective provides wide spectral coverage, mode-hop free tuning, and high frequency stability short timescales, showing as ultra-narrow intrinsic linewidths. However, many applications also require long-term stability, which can be provided by...

We present a compact iodine-stabilized laser system at 633 nm, based on distributed-feedback diode. Within footprint of $27\times 15$ cm$^2$ the provides 5 mW frequency stabilized light from single-mode fiber. Its performance was evaluated in comparison to Cs clocks representing primary standards, realizing SI unit Hz via an optical comb. With best suited absorption line reaches fractional instability below $10^{-10}$ for averaging times above 10 s. The investigated several iodine lines and...

This work reports on a compact single-mode diode laser emitting at 633 nm based an AlGaAs/AlGaInP structure with integrated DBR surface grating. The micro-fabricated package includes optics for beam shaping, optical isolation and fiber coupling. miniaturized isolator is cadmium manganese telluride, which provides large Verdet constant thus enables the realization of Faraday rotator in visible spectral range. We discuss performance technological challenges this approach. Furthermore, we...

This work reports on a compact diode-laser module emitting at 633 nm. The emission frequency can be tuned with temperature and current, while optical feedback of an internal DBR grating ensures single-mode operation. laser diode is integrated into micro-fabricated package, which includes optics for beam shaping, miniaturized isolator, vapor cell as reference. achieved absolute stability below 10⁻⁸ , the output power more than 10 mW. frequency-stabilized system replace gas lasers...

We introduce a diode-based laser with fast frequency noise of 30 Hz²/Hz, corresponding to Lorentzian linewidth 100 Hz. examine its characteristics in detail. Our focus is on exploring the variations and similarities reduction. Additionally, we present locking capability these systems when applied medium finesse cavities. The results provide insights into unique operational ultra-low lasers their potential applications quantum technology.

We will present our latest innovations on high-power diode lasers and discuss their application in quantum technologies. show that these laser sources are key not only to explore the magic world of physics, but also drive commercialization exciting new applications coming along with second revolution, such as computers, -sensing, -metrology optical clocks. Compared other gas- or solid-state lasers, offer advantages for applications, e.g. compactness, low weight, energy consumption cost ownership.

We present hybrid-integrated extended cavity diode lasers tunable around 637 nm, with a gain-wide spectral coverage of 8 nm. This tuning range allows addressing the zero-phonon line nitrogen vacancy centers and includes wavelength HeNe (633 nm). The provide wide mode-hop free up to 97 GHz narrow intrinsic linewidth down 10 kHz. maximum output power is 2.5 mW in single-mode fiber, corresponding an on-chip 4.0 mW. Full integration packaging standard housing fiber pigtails high stability will...

We present two distinct ultra-low frequency noise lasers at 729 nm with a fast of 30 Hz^2/Hz, corresponding to Lorentzian linewidth 0.1 kHz. The characteristics both lasers, which are based on different types laser diodes, investigated using experimental and theoretical analysis focus identifying the advantages disadvantages each type system. Specifically, we study differences similarities in mode behaviour while tuning reduction. Furthermore, demonstrate locking capability these systems...

We present a machine learning approach to automatic frequency locking of lasers based on artificial neural networks. show that this method reliably identifies the target line under wide range operating conditions.

We present a novel approach to Bragg-fiber extended diode lasers by using an integrated waveguide circuit as interposer. The interposer suppresses undesired ASE more than 20 dB compared previous designs.