11 research outputs found
Integrated Phononic Waveguides in Diamond
Efficient generation, guiding, and detection of phonons, or mechanical
vibrations, are of interest in various fields including radio frequency
communication, sensing, and quantum information. Diamond is an important
platform for phononics because of the presence of strain-sensitive spin qubits,
and its high Young's modulus which allows for low-loss gigahertz devices. We
demonstrate a diamond phononic waveguide platform for generating, guiding, and
detecting gigahertz-frequency surface acoustic wave (SAW) phonons. We generate
SAWs using interdigital transducers integrated on AlN/diamond and observe SAW
transmission at 4-5 GHz through both ridge and suspended waveguides, with
wavelength-scale cross sections (~1 {\mu}m2) to maximize spin-phonon
interaction. This work is a crucial step for developing acoustic components for
quantum phononic circuits with strain-sensitive color centers in diamond
High Q-factor diamond optomechanical resonators with silicon vacancy centers at millikelvin temperatures
Phonons are envisioned as coherent intermediaries between different types of
quantum systems. Engineered nanoscale devices such as optomechanical crystals
(OMCs) provide a platform to utilize phonons as quantum information carriers.
Here we demonstrate OMCs in diamond designed for strong interactions between
phonons and a silicon vacancy (SiV) spin. Using optical measurements at
millikelvin temperatures, we measure a linewidth of 13 kHz (Q-factor of
~440,000) for 6 GHz acoustic modes, a record for diamond in the GHz frequency
range and within an order of magnitude of state-of-the-art linewidths for OMCs
in silicon. We investigate SiV optical and spin properties in these devices and
outline a path towards a coherent spin-phonon interface.Comment: 18 pages, 11 figure
Quantum interference of electromechanically stabilized emitters in nanophotonic devices
Photon-mediated coupling between distant matter qubits may enable secure
communication over long distances, the implementation of distributed quantum
computing schemes, and the exploration of new regimes of many-body quantum
dynamics. Nanophotonic devices coupled to solid-state quantum emitters
represent a promising approach towards realization of these goals, as they
combine strong light-matter interaction and high photon collection
efficiencies. However, the scalability of these approaches is limited by the
frequency mismatch between solid-state emitters and the instability of their
optical transitions. Here we present a nano-electromechanical platform for
stabilization and tuning of optical transitions of silicon-vacancy (SiV) color
centers in diamond nanophotonic devices by dynamically controlling their strain
environments. This strain-based tuning scheme has sufficient range and
bandwidth to alleviate the spectral mismatch between individual SiV centers.
Using strain, we ensure overlap between color center optical transitions and
observe an entangled superradiant state by measuring correlations of photons
collected from the diamond waveguide. This platform for tuning spectrally
stable color centers in nanophotonic waveguides and resonators constitutes an
important step towards a scalable quantum network
Development of a Boston-area 50-km fiber quantum network testbed
Distributing quantum information between remote systems will necessitate the
integration of emerging quantum components with existing communication
infrastructure. This requires understanding the channel-induced degradations of
the transmitted quantum signals, beyond the typical characterization methods
for classical communication systems. Here we report on a comprehensive
characterization of a Boston-Area Quantum Network (BARQNET) telecom fiber
testbed, measuring the time-of-flight, polarization, and phase noise imparted
on transmitted signals. We further design and demonstrate a compensation system
that is both resilient to these noise sources and compatible with integration
of emerging quantum memory components on the deployed link. These results have
utility for future work on the BARQNET as well as other quantum network
testbeds in development, enabling near-term quantum networking demonstrations
and informing what areas of technology development will be most impactful in
advancing future system capabilities.Comment: 9 pages, 5 figures + Supplemental Material
2022 Roadmap on integrated quantum photonics
AbstractIntegrated photonics will play a key role in quantum systems as they grow from few-qubit prototypes to tens of thousands of qubits. The underlying optical quantum technologies can only be realized through the integration of these components onto quantum photonic integrated circuits (QPICs) with accompanying electronics. In the last decade, remarkable advances in quantum photonic integration have enabled table-top experiments to be scaled down to prototype chips with improvements in efficiency, robustness, and key performance metrics. These advances have enabled integrated quantum photonic technologies combining up to 650 optical and electrical components onto a single chip that are capable of programmable quantum information processing, chip-to-chip networking, hybrid quantum system integration, and high-speed communications. In this roadmap article, we highlight the status, current and future challenges, and emerging technologies in several key research areas in integrated quantum photonics, including photonic platforms, quantum and classical light sources, quantum frequency conversion, integrated detectors, and applications in computing, communications, and sensing. With advances in materials, photonic design architectures, fabrication and integration processes, packaging, and testing and benchmarking, in the next decade we can expect a transition from single- and few-function prototypes to large-scale integration of multi-functional and reconfigurable devices that will have a transformative impact on quantum information science and engineering
Improving Signal-to-Noise Performance for DNA Translocation in Solid-State Nanopores at MHz Bandwidths
DNA sequencing using solid-state
nanopores is, in part, impeded
by the relatively high noise and low bandwidth of the current state-of-the-art
translocation measurements. In this Letter, we measure the ion current
noise through sub 10 nm thick Si<sub>3</sub>N<sub>4</sub> nanopores
at bandwidths up to 1 MHz. At these bandwidths, the input-referred
current noise is dominated by the amplifier’s voltage noise
acting across the total capacitance at the amplifier input. By reducing
the nanopore chip capacitance to the 1–5 pF range by adding
thick insulating layers to the chip surface, we are able to transition
to a regime in which input-referred current noise (∼117–150
pArms at 1 MHz in 1 M KCl solution) is dominated by the effects of
the input capacitance of the amplifier itself. The signal-to-noise
ratios (SNRs) reported here range from 15 to 20 at 1 MHz for dsDNA
translocations through nanopores with diameters from 4 to 8 nm with
applied voltages from 200 to 800 mV. Further advances in bandwidth
and SNR will require new amplifier designs that reduce both input
capacitance and input-referred amplifier noise
2022 Roadmap on integrated quantum photonics
Integrated photonics will play a key role in quantum systems as they grow from few-qubit prototypes to tens of thousands of qubits. The underlying optical quantum technologies can only be realized through the integration of these components onto quantum photonic integrated circuits (QPICs) with accompanying electronics. In the last decade, remarkable advances in quantum photonic integration have enabled table-top experiments to be scaled down to prototype chips with improvements in efficiency, robustness, and key performance metrics. These advances have enabled integrated quantum photonic technologies combining up to 650 optical and electrical components onto a single chip that are capable of programmable quantum information processing, chip-to-chip networking, hybrid quantum system integration, and high-speed communications. In this roadmap article, we highlight the status, current and future challenges, and emerging technologies in several key research areas in integrated quantum photonics, including photonic platforms, quantum and classical light sources, quantum frequency conversion, integrated detectors, and applications in computing, communications, and sensing. With advances in materials, photonic design architectures, fabrication and integration processes, packaging, and testing and benchmarking, in the next decade we can expect a transition from single- and few-function prototypes to large-scale integration of multi-functional and reconfigurable devices that will have a transformative impact on quantum information science and engineering.ISSN:2515-764