73 research outputs found
Design and Optical Properties of Electromechanical Double-Membrane Photonic Crystal Cavities
Nanomechanical single-photon routing
The merger between integrated photonics and quantum optics promises new
opportunities within photonic quantum technology with the very significant
progress on excellent photon-emitter interfaces and advanced optical circuits.
A key missing functionality is rapid circuitry reconfigurability that
ultimately does not introduce loss or emitter decoherence, and operating at a
speed matching the photon generation and quantum memory storage time of the
on-chip quantum emitter. This ambitious goal requires entirely new active
quantum-photonic devices by extending the traditional approaches to
reconfigurability. Here, by merging nano-optomechanics and deterministic
photon-emitter interfaces we demonstrate on-chip single-photon routing with low
loss, small device footprint, and an intrinsic time response approaching the
spin coherence time of solid-state quantum emitters. The device is an essential
building block for constructing advanced quantum photonic architectures
on-chip, towards, e.g., coherent multi-photon sources, deterministic
photon-photon quantum gates, quantum repeater nodes, or scalable quantum
networks.Comment: 7 pages, 3 figures, supplementary informatio
Electro-optic routing of photons from single quantum dots in photonic integrated circuits
Recent breakthroughs in solid-state photonic quantum technologies enable
generating and detecting single photons with near-unity efficiency as required
for a range of photonic quantum technologies. The lack of methods to
simultaneously generate and control photons within the same chip, however, has
formed a main obstacle to achieving efficient multi-qubit gates and to harness
the advantages of chip-scale quantum photonics. Here we propose and demonstrate
an integrated voltage-controlled phase shifter based on the electro-optic
effect in suspended photonic waveguides with embedded quantum emitters. The
phase control allows building a compact Mach-Zehnder interferometer with two
orthogonal arms, taking advantage of the anisotropic electro-optic response in
gallium arsenide. Photons emitted by single self-assembled quantum dots can be
actively routed into the two outputs of the interferometer. These results,
together with the observed sub-microsecond response time, constitute a
significant step towards chip-scale single-photon-source de-multiplexing,
fiber-loop boson sampling, and linear optical quantum computing.Comment: 7 pages, 4 figues + supplementary informatio
Enhanced spontaneous emission from quantum dots in short photonic crystal waveguides
We report a study of the quantum dot emission in short photonic crystal
waveguides. We observe that the quantum dot photoluminescence intensity and
decay rate are strongly enhanced when the emission energy is in resonance with
Fabry-Perot cavity modes in the slow-light regime of the dispersion curve. The
experimental results are in agreement with previous theoretical predictions and
further supported by three-dimensional finite element simulation. Our results
show that the combination of slow group velocity and Fabry-Perot cavity
resonance provides an avenue to efficiently channel photons from quantum dots
into waveguides for integrated quantum photonic applications.Comment: 12 pages, 4 figure
Curved GaAs cantilever waveguides for the vertical coupling to photonic integrated circuits
We report the nanofabrication and characterization of optical spot-size
converters couplers based on curved GaAs cantilever waveguides. Using the
stress mismatch between the GaAs substrate and deposited Cr-Ni-Au strips,
single-mode waveguides can be bent out-of-plane in a controllable manner. A
stable and vertical orientation of the out-coupler is achieved by locking the
spot-size converter at a fixed 90 angle via short-range forces. The
optical transmission is characterized as a function of temperature and
polarization, resulting in a broad-band chip-to-fiber coupling extending over a
200 nm wavelength bandwidth. The methods reported here are fully compatible
with quantum photonic integrated circuit technology with quantum dot emitters,
and open opportunities to design novel photonic devices with enhanced
functionality
Independent operation of two waveguide-integrated quantum emitters
We demonstrate the resonant excitation of two quantum dots in a photonic
integrated circuit for on-chip single-photon generation in multiple spatial
modes. The two quantum dots are electrically tuned to the same emission
wavelength using a pair of isolated -- junctions and excited by a
resonant pump laser via dual-mode waveguides. We demonstrate two-photon quantum
interference visibility of under continuous-wave excitation of
narrow-linewidth quantum dots. Our work solves an outstanding challenge in
quantum photonics by realizing the key enabling functionality of how to
scale-up deterministic single-photon sources.Comment: 7 pages 3 figures, Supplementary materials 7 pages 9 figure
Coupling of single quantum dots to photonic crystal cavities investigated by low-temperature scanning near-field optical microscopy
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