CQN is developing the entire technology stack to reliably carry quantum data across the globe, serving diverse applications across many user groups simultaneously... spurring new technology industries and a competitive marketplace of quantum service providers and application developers.
On Monday, September 30 2024, the 4th floor of the Grand Challenges Research Building at the University of Arizona, hosted an open house. The goal was to create a community around the quantum research happening at the University of Arizona. In attendance was Ford Burkhart who wrote a lovely piece on the event and work […]
We’re pleased to release the dates for our 2025 Winter School on Quantum Networks. Keep an eye out for the registration to open soon! All courses will be held via Zoom, co-taught by CQN faculty, postdocs and students.
Join us for a World Quantum Day panel organized jointly by the Perimeter Institute and Quantum Ethics Project and sponsored by CQN. Our discussion will feature Raymond LaFlamme (Institute for Quantum Computing), Zeki Seskir (Karlsruhe Institute of Technology (KIT)) Jean Olemou (Leap Quantik) Taqi Raza (Center for Quantum Networks) and Joan Arrow (Quantum Ethics Project, Center for Quantum Networks). The panel will discuss how […]
Narayanan Rengaswamy is a an assistant professor in the Electrical and Computer Engineering program at the University of Arizona.He also works at the NSF Engineering Research Center for Quantum Networks (CQN) in the university. He discusses his research focuses on quantum error correction and fault tolerance.
Optica Quantum is a new online-only journal dedicated to high-impact results in quantum information science and technology (QIST), as enabled by optics and photonics. Optica Quantum will publish its first issue in September 2023. Its scope will encompass theoretical and experimental research as well as technological advances in and applications of quantum optics. In addition, the Journal will […]
We are pleased to announce the appointment of Julie Des Jardins as the new Director for Diversity and Culture of Inclusion (DCI) within CQN. Dr. Des Jardins is a cultural historian, educator, and DEI practitioner who examines gender, race, and intersectional identity in American culture, particularly in academia, athletics, politics, and STEM. She has also […]
A short video highlighting CQN’s work in building the quantum Internet was featured at the American Physical Society (APS) meeting in Las Vegas in March 2023. The six-minute video features laboratory footage from multiple CQN campuses and interviews with director Saikat Guha, as well as investigators Linran Fan, Dirk Englund, Jane Bambauer, Don Towsley, and […]
All nine courses can be found on our YouTube channel in the CQN Winter School for Quantum Networks playlist. Slides associated with the courses can be found here.
Check out additional stories and events from the Center for Quantum Networks.
Here we show a photonic computing accelerator utilizing a system-level
thin-film lithium niobate circuit which overcomes this limitation. Leveraging
the strong electro-optic (Pockels) effect and the scalability of this platform,
we demonstrate photonic computation at speeds up to 1.36 TOPS while consuming
0.057 pJ/OP. Our system features more than 100 thin-film lithium niobate
high-performance components working synergistically, surpassing
state-of-the-art systems on this platform. We further demonstrate
binary-classification, handwritten-digit classification, and image
classification with remarkable accuracy, showcasing our system’s capability of
executing real algorithms. Finally, we investigate the opportunities offered by
combining our system with a hybrid-integrated distributed feedback laser source
and a heterogeneous-integrated modified uni-traveling carrier photodiode. Our
results illustrate the promise of thin-film lithium niobate as a computational
platform, addressing current bottlenecks in both electronic and photonic
computation. Its unique properties of high-performance electro-optic weight
encoding and conversion, wafer-scale scalability, and compatibility with
integrated lasers and detectors, position thin-film lithium niobate photonics
as a valuable complement to silicon photonics, with extensions to applications
in ultrafast and power-efficient signal processing and ranging.
Hong-Ou-Mandel effect is an important demonstration of particle
indistinguishability, when identical single photons interfere at a beamsplitter
to generate the two-photon entangled NOON state. On the other hand, NOON states
with $Nge3$ photons have long been conjectured beyond the deterministic
generation of photon interference. To characterize the separation, we introduce
the notion of genuine non-Gaussian entanglement (NGE), which cannot be
generated via a generalized Hong-Ou-Mandel experiment, with Gaussian protocols
extending the beamsplitter and separable input states replacing the single
photons. We establish a resource theory to characterize such quantum
correlations beyond Hong-Ou-Mandel and prove that NOON states with $Nge 3$ are
indeed among the NGE class. With the generalized Hong-Ou-Mandel protocol as
free operations, we introduce two monotones to characterize genuine
non-Gaussian entanglement: one derived from the entanglement entropy and the
other from the minimal extension size required to convert a state into a free
state. Finally, we demonstrate that the tomography process of pure free states
can be performed efficiently, while all learning protocols of states with
genuine non-Gaussian entanglement require exponential overheads connected to
the monotone. This implies that states generated in Boson sampling are
efficiently learnable despite its measurement statistics being hard to sample
from.
Quantum resistance is vital for emerging cryptographic systems as quantum
technologies continue to advance towards large-scale, fault-tolerant quantum
computers. Resistance may be offered by quantum key distribution (QKD), which
provides information-theoretic security using quantum states of photons, but
may be limited by transmission loss at long distances. An alternative approach
uses classical means and is conjectured to be resistant to quantum attacks,
so-called post-quantum cryptography (PQC), but it is yet to be rigorously
proven, and its current implementations are computationally expensive. To
overcome the security and performance challenges present in each, here we
develop hybrid protocols by which QKD and PQC inter-operate within a joint
quantum-classical network. In particular, we consider different hybrid designs
that may offer enhanced speed and/or security over the individual performance
of either approach. Furthermore, we present a method for analyzing the security
of hybrid protocols in key distribution networks. Our hybrid approach paves the
way for joint quantum-classical communication networks, which leverage the
advantages of both QKD and PQC and can be tailored to the requirements of
various practical networks.
Quantum resistance is vital for emerging cryptographic systems as quantum
technologies continue to advance towards large-scale, fault-tolerant quantum
computers. Resistance may be offered by quantum key distribution (QKD), which
provides information-theoretic security using quantum states of photons, but
may be limited by transmission loss at long distances. An alternative approach
uses classical means and is conjectured to be resistant to quantum attacks,
so-called post-quantum cryptography (PQC), but it is yet to be rigorously
proven, and its current implementations are computationally expensive. To
overcome the security and performance challenges present in each, here we
develop hybrid protocols by which QKD and PQC inter-operate within a joint
quantum-classical network. In particular, we consider different hybrid designs
that may offer enhanced speed and/or security over the individual performance
of either approach. Furthermore, we present a method for analyzing the security
of hybrid protocols in key distribution networks. Our hybrid approach paves the
way for joint quantum-classical communication networks, which leverage the
advantages of both QKD and PQC and can be tailored to the requirements of
various practical networks.
See all the latest pre-published papers from our team of collaborators.
