10 research outputs found
Optically-Heralded Entanglement of Superconducting Systems in Quantum Networks
Networking superconducting quantum computers is a longstanding challenge in
quantum science. The typical approach has been to cascade transducers:
converting to optical frequencies at the transmitter and to microwave
frequencies at the receiver. However, the small microwave-optical coupling and
added noise have proven formidable obstacles. Instead, we propose optical
networking via heralding end-to-end entanglement with one detected photon and
teleportation. In contrast to cascaded direct transduction, our scheme absorbs
the low optical-microwave coupling efficiency into the heralding step, thus
breaking the rate-fidelity trade-off. Moreover, this technique unifies and
simplifies entanglement generation between superconducting devices and other
physical modalities in quantum networks
Scalable photonic integrated circuits for programmable control of atomic systems
Advances in laser technology have driven discoveries in atomic, molecular,
and optical (AMO) physics and emerging applications, from quantum computers
with cold atoms or ions, to quantum networks with solid-state color centers.
This progress is motivating the development of a new generation of
"programmable optical control" systems, characterized by criteria (C1) visible
(VIS) and near-infrared (IR) wavelength operation, (C2) large channel counts
extensible beyond 1000s of individually addressable atoms, (C3) high intensity
modulation extinction and (C4) repeatability compatible with low gate errors,
and (C5) fast switching times. Here, we address these challenges by introducing
an atom control architecture based on VIS-IR photonic integrated circuit (PIC)
technology. Based on a complementary metal-oxide-semiconductor (CMOS)
fabrication process, this Atom-control PIC (APIC) technology meets the system
requirements (C1)-(C5). As a proof of concept, we demonstrate a 16-channel
silicon nitride based APIC with (5.80.4) ns response times and -30 dB
extinction ratio at a wavelength of 780 nm. This work demonstrates the
suitability of PIC technology for quantum control, opening a path towards
scalable quantum information processing based on optically-programmable atomic
systems
A scalable cavity-based spin-photon interface in a photonic integrated circuit
A central challenge in quantum networking is transferring quantum states
between different physical modalities, such as between flying photonic qubits
and stationary quantum memories. One implementation entails using spin-photon
interfaces that combine solid-state spin qubits, such as color centers in
diamond, with photonic nanostructures. However, while high-fidelity spin-photon
interactions have been demonstrated on isolated devices, building practical
quantum repeaters requires scaling to large numbers of interfaces yet to be
realized. Here, we demonstrate integration of nanophotonic cavities containing
tin-vacancy (SnV) centers in a photonic integrated circuit (PIC). Out of a
six-channel quantum micro-chiplet (QMC), we find four coupled SnV-cavity
devices with an average Purcell factor of ~7. Based on system analyses and
numerical simulations, we find with near-term improvements this multiplexed
architecture can enable high-fidelity quantum state transfer, paving the way
towards building large-scale quantum repeaters.Comment: to be published in Optica Quantu
Nanoelectromechanical control of spin-photon interfaces in a hybrid quantum system on chip
Atom-like defects or color centers (CC's) in nanostructured diamond are a
leading platform for optically linked quantum technologies, with recent
advances including memory-enhanced quantum communication, multi-node quantum
networks, and spin-mediated generation of photonic cluster states. Scaling to
practically useful applications motivates architectures meeting the following
criteria: C1 individual optical addressing of spin qubits; C2 frequency tuning
of CC spin-dependent optical transitions; C3 coherent spin control in CC ground
states; C4 active photon routing; C5 scalable manufacturability; and C6 low
on-chip power dissipation for cryogenic operations. However, no architecture
meeting C1-C6 has thus far been demonstrated. Here, we introduce a hybrid
quantum system-on-chip (HQ-SoC) architecture that simultaneously achieves
C1-C6. Key to this advance is the realization of piezoelectric strain control
of diamond waveguide-coupled tin vacancy centers to meet C2 and C3, with
ultra-low power dissipation necessary for C6. The DC response of our device
allows emitter transition tuning by over 20 GHz, while the large frequency
range (exceeding 2 GHz) enables low-power AC control. We show acoustic
manipulation of integrated tin vacancy spins and estimate single-phonon
coupling rates over 1 kHz in the resolved sideband regime. Combined with
high-speed optical routing with negligible static hold power, this HQ-SoC
platform opens the path to scalable single-qubit control with optically
mediated entangling gates
Multiplexed control of spin quantum memories in a photonic circuit
A central goal in many quantum information processing applications is a
network of quantum memories that can be entangled with each other while being
individually controlled and measured with high fidelity. This goal has
motivated the development of programmable photonic integrated circuits (PICs)
with integrated spin quantum memories using diamond color center spin-photon
interfaces. However, this approach introduces a challenge in the microwave
control of individual spins within closely packed registers. Here, we present a
quantum-memory-integrated photonics platform capable of (i) the integration of
multiple diamond color center spins into a cryogenically compatible, high-speed
programmable PIC platform; (ii) selective manipulation of individual spin
qubits addressed via tunable magnetic field gradients; and (iii) simultaneous
control of multiple qubits using numerically optimized microwave pulse shaping.
The combination of localized optical control, enabled by the PIC platform,
together with selective spin manipulation opens the path to scalable quantum
networks on intra-chip and inter-chip platforms.Comment: 10 pages, 4 figure
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Field programmable spin arrays for scalable quantum repeaters.
The large scale control over thousands of quantum emitters desired by quantum network technology is limited by the power consumption and cross-talk inherent in current microwave techniques. Here we propose a quantum repeater architecture based on densely-packed diamond color centers (CCs) in a programmable electrode array, with quantum gates driven by electric or strain fields. This field programmable spin array (FPSA) enables high-speed spin control of individual CCs with low cross-talk and power dissipation. Integrated in a slow-light waveguide for efficient optical coupling, the FPSA serves as a quantum interface for optically-mediated entanglement. We evaluate the performance of the FPSA architecture in comparison to a routing-tree design and show an increased entanglement generation rate scaling into the thousand-qubit regime. Our results enable high fidelity control of dense quantum emitter arrays for scalable networking
Spin-Phonon-Photon Strong Coupling in a Piezomechanical Nanocavity
We introduce a hybrid tripartite quantum system for strong coupling between a
semiconductor spin, a mechanical phonon, and a microwave photon. Consisting of
a piezoelectric resonator with an integrated diamond strain concentrator, this
system achieves microwave-acoustic and spin-acoustic coupling rates MHz
or greater, allowing for simultaneous ultra-high cooperativities (
and , respectively). From finite-element modeling and master
equation simulations, we estimate photon-to-spin quantum state transfer
fidelities exceeding 0.97 based on separately demonstrated device parameters.
We anticipate that this device will enable hybrid quantum architectures that
leverage the advantages of both superconducting circuits and solid-state spins
for information processing, memory, and networking
Cavity-enhanced emission from an ensemble of color centers in silicon
Optical quantum technologies require strong light-matter interaction. We couple silicon color center ensembles to high-Q/V cavities and show enhanced emission in the telecommunications O-band.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.QID/Hanson La
Cavity-enhanced single artificial atoms in silicon
Abstract Artificial atoms in solids are leading candidates for quantum networks, scalable quantum computing, and sensing, as they combine long-lived spins with mobile photonic qubits. Recently, silicon has emerged as a promising host material where artificial atoms with long spin coherence times and emission into the telecommunications band can be controllably fabricated. This field leverages the maturity of silicon photonics to embed artificial atoms into the worldās most advanced microelectronics and photonics platform. However, a current bottleneck is the naturally weak emission rate of these atoms, which can be addressed by coupling to an optical cavity. Here, we demonstrate cavity-enhanced single artificial atomsĀ in silicon (G-centers) at telecommunication wavelengths. Our results show enhancement of their zero phonon line intensities along with highly pure single-photon emission, while their lifetime remains statistically unchanged. We suggest the possibility of two different existing types of G-centers, shedding new light on the properties of silicon emitters