Rod Van MeterLast Friday, we updated our Q-Fly paper on the arXiv.
#quantumComputing #quantumNetwork
arxiv.org/abs/2412.09299
This is a BIG update to the paper, so check it out.
Rod Van MeterLast Friday, we updated our Q-Fly paper on the arXiv.
#quantumComputing #quantumNetwork
arxiv.org/abs/2412.09299
Q-Fly: An Optical Interconnect...
Q-Fly: An Optical Interconnect...
Q-Fly: An Optical Interconnect for Modular Quantum Computers
Much like classical supercomputers, scaling up quantum computers requires an optical interconnect. However, signal attenuation leads to irreversible qubit loss, making quantum interconnect design guidelines and metrics different from conventional computing. Inspired by the classical Dragonfly topology, we propose a multi-group structure where the group switch routes photons emitted by computational end nodes to the group's shared pool of Bell state analyzers (which conduct the entanglement swapping that creates end-to-end entanglement) or across a low-diameter path to another group. We present a full-stack analysis of system performance, a combination of distributed and centralized protocols, and a resource scheduler that plans qubit placement and communications for large-scale, fault-tolerant systems. We implement a prototype three-node switched interconnect to justify hardware-side scalability and to expose low-level architectural challenges. We create two-hop entanglement with fidelities of 0.6-0.76. Our design emphasizes reducing network hops and optical components to simplify system stabilization while flexibly adjusting optical path lengths. Based on evaluated loss and infidelity budgets, we find that moderate-radix switches enable systems meeting expected near-term needs, and large systems are feasible. Our design is expected to be effective for a variety of quantum computing technologies, including ion traps and neutral atoms.
Bob CarverIBM and Cisco's Quantum Network Gambit: Blueprint for a 2030s Internet Revolution https://www.webpronews.com/ibm-and-ciscos-quantum-network-gambit-blueprint-for-a-2030s-internet-revolution/ #QuantumComputing #Networking #IBM #Cisco #QuantumEntanglement #QuantumNetwork
techiIBM and Cisco are collaborating to build a global quantum network by the early 2030s, aiming to connect quantum computers for breakthroughs in computing, materials, and secure communications. The project tackles major technical challenges with a unified roadmap and open-source tools.
#QuantumComputing #IBM #Cisco #QuantumNetwork #QuantumInternet #FutureTech #Innovation #OpenSource #TechPartnership #TECHi
Read Full Article Here :- https://www.techi.com/ibm-cisco-quantum-computer-network/
This was a long time ago now:
https://arxiv.org/abs/quant-ph/0607065
#quantumcomputing #quantumnetwork
https://arxiv.org/abs/quant-ph/0607065
#quantumcomputing #quantumnetwork
Architecture of a Quantum Multicomputer Optimized for Shor's Factoring Algorithm
The quantum multicomputer consists of a large number of small nodes and a qubus interconnect for creating entangled state between the nodes. The primary metric chosen is the performance of such a system on Shor's algorithm for factoring large numbers: specifically, the quantum modular exponentiation step that is the computational bottleneck. This dissertation introduces a number of optimizations for the modular exponentiation. My algorithms reduce the latency, or circuit depth, to complete the modular exponentiation of an n-bit number from O(n^3) to O(n log^2 n) or O(n^2 log n), depending on architecture. Calculations show that these algorithms are one million times and thirteen thousand times faster, when factoring a 6,000-bit number, depending on architecture. Extending to the quantum multicomputer, five different qubus interconnect topologies are considered, and two forms of carry-ripple adder are found to be the fastest for a wide range of performance parameters. The links in the quantum multicomputer are serial; parallel links would provide only very modest improvements in system reliability and performance. Two levels of the Steane [[23,1,7]] error correction code will adequately protect our data for factoring a 1,024-bit number even when the qubit teleportation failure rate is one percent.
Marek GluzaHere's an #introduction of @frederikhahn as part of my agenda that #nice should be a characteristic demanded of academics.
In the past few years Freddy has been gently cracking his head on how to remove bottlenecks in a #quantumNetwork. He focused on relevant #quantum states and tweaked their parts like he tweaks parts in his bike to make it run seamlessly
https://arxiv.org/abs/1805.04559
(Local complementations interest me for #quantumCompiling: the unitary encoding the repetition code can be turned into a gate between any two qubits because one can distill Bell pairs out of #GHZ states.)
Rick came from Berlin to the #quantumInformation #workshop in #benasque by train. His tap water canister was half empty: he realized that meh whatev he can travel half Europe and not eat if the food is not what he wants provided he has water to last him even more than 24 hs.
Frederik is a scientist who leads by example, is sustainably concerned about the #climateCrisis but look at him shining. His #intermittentFasting skills allowed him to be chilled after a strainous long distance travel but I learn from him that being nice and chilled is a muscle we can all train.
His integrity at work reminds me that it's not impossible to keep our humanity first and also excell at research. I wish we had an equivalent of #citationMetrics for acts of kindness in academia.
These photos were taken on a Friday, on Monday that week he defended his thesis. In style, which is his style. For his #phd hat I'd add a phone charger, his daily cycling suffices to top up the battery. I don't know how to symbolize my thanks for having made my local science world wholesome, one #introvert thought at a time, but: thank you for caring, Dr Hahn!
Quantum network routing and local complementation
Quantum communication between distant parties is based on suitable instances of shared entanglement. For efficiency reasons, in an anticipated quantum network beyond point-to-point communication, it is preferable that many parties can communicate simultaneously over the underlying infrastructure; however, bottlenecks in the network may cause delays. Sharing of multi-partite entangled states between parties offers a solution, allowing for parallel quantum communication. Specifically for the two-pair problem, the butterfly network provides the first instance of such an advantage in a bottleneck scenario. The underlying method differs from standard repeater network approaches in that it uses a graph state instead of maximally entangled pairs to achieve long-distance simultaneous communication. We will demonstrate how graph theoretic tools, and specifically local complementation, help decrease the number of required measurements compared to usual methods applied in repeater schemes. We will examine other examples of network architectures, where deploying local complementation techniques provides an advantage. We will finally consider the problem of extracting graph states for quantum communication via local Clifford operations and Pauli measurements, and discuss that while the general problem is known to be NP-complete, interestingly, for specific classes of structured resources, polynomial time algorithms can be identified.
Dr. Aimee K. GuntherGreat work out of Paul Barclay's group at UCalgary 🇨🇦:
↪️ a review paper on advances and outstanding challenges in nanofabrication, cavity optomechanics, and the development of qubit-photon interfaces ➡️ towards the realization of a universal quantum network
"Diamond Integrated Quantum Nanophotonics: Spins, Photons and Phonons"
https://ieeexplore.ieee.org/document/9904837/
#Quantum #QuantumNetwork #QuantumCommunication #QuantumTechnology
Diamond Integrated Quantum Nanophotonics: Spins, Photons and Phonons
Integrated photonic devices in diamond have tremendous potential for many quantum applications, including long-distance quantum communication, quantum information processing, and quantum sensing. These devices benefit from diamond's combination of exceptional thermal, optical, and mechanical properties. Its wide electronic bandgap makes diamond an ideal host for a variety of optical active spin qubits that are key building blocks for quantum technologies. In landmark experiments, diamond spin qubits have enabled demonstrations of remote entanglement, memory-enhanced quantum communication, and multi-qubit spin registers with fault-tolerant quantum error correction, leading to the realization of multinode quantum networks. These advances put diamond at the forefront of solid-state material platforms for quantum information processing. Recent developments in diamond nanofabrication techniques provide a promising route to further scaling of these landmark experiments towards real-life quantum technologies. In this paper, we focus on the recent progress in creating integrated diamond quantum photonic devices, with particular emphasis on spin-photon interfaces, cavity optomechanical devices, and spin-phonon transduction. Finally, we discuss prospects and remaining challenges for the use of diamond in scalable quantum technologies.