IBM Quantum Network Enables Quantum Computer Internet
IBM Announces Quantum Networking Project to Create Quantum Computing Internet
IBM Quantum Network
Although an important current goal, fault-tolerant quantum computing is only one part of IBM's future computing strategy. IBM is developing quantum-centric supercomputing, which employs CPUs, GPUs, and QPUs to compute. IBM must network quantum computers to expand beyond its current development strategy.
Distributed System Scaling Beyond the Roadmap IBM's development goal calls for a computer with one billion operations on 2,000 qubits to execute quantum circuits by 2033. Distributed quantum computing with networked systems will expand circuits by orders of magnitude in operations and qubits. The goal is a quantum computer internet beyond this scale.
Collaborations and new research are needed for this future. IBM revealed plans to partner with four of the five NQISR centres to advance research into technologies beyond the development roadmap, such as the quantum computing internet. IBM and Cisco plan to connect quantum processors to prepare for distributed quantum computing.
Quantum computer networking is a challenging task that requires novel research and a structured methodology. The first major milestone in five years will be entangling two cryogenically separated quantum processors, which will require partners.
Quantum Entanglement: Connective Tissue Consider classical networking to understand quantum networking. Traditional computers process binary data using code-changing instructions. Linked classical computers follow cause-and-effect concepts; one waits for a message before acting. Links between computers, or nodes, establish a network like the global internet.
Quantum computers process quantum-encoded information using non-intuitive atomic-scale mathematics. Like conventional systems, quantum computer nodes can create distributed networks that may expand into a quantum computing internet.
The formation of entanglement between linked elements following quantum link activation distinguishes quantum from classical networks. Entangled quantum computers act theoretically as a single entity, not as cause-and-effect machines. Two quantum processors linked across a link can function as a quantum computer over long distances. Operations at one node could quickly modify results at the nodes it is entangled with.
Remember that this connectivity does not mean information moves faster than light. The “quantum no-communication theorem” argues that quantum information collapses into a classical output after measurement, meaning nothing done at node A will immediately affect node B. To understand calculations across nodes, classical outputs must be collected and delivered via a classical link.
Data centres, enhanced sensing Networked quantum computers allow users to build larger quantum datacenters with more qubits and quantum circuits. IBM's Crossbill and Flamingo processors have revealed that modular quantum processors need short-range connections to perform larger quantum operations. Quantum processing units connected over meters-long cables might form a datacenter quantum computing cluster.
Quantum sensing may benefit from networking. Quantum systems make precise measurements. In the search for gravitational waves, LIGO uses quantum sensors to produce extremely accurate observations. A quantum connection linked to a quantum sensor may allow interferometry to create a sensor network and increase accuracy.
QNU and Couplers
This link relies on the Quantum Networking Unit (QNU). QNUs interface processors and interconnects. They turn static qubits encoded on stationary processors into “flying” qubits that can travel across a network. Photons inherently support flying qubits, and the network architecture needed depends on their frequency (microwave or optical).
IBM is scoping a variety of coupling technologies for different purposes, length scales, and issues with partners.
IBM is developing l-couplers internally. To connect QPUs, these are engineered to work in dilution refrigerators at quantum processor temperature. Starling needs high-fidelity l-couplers to provide fault-tolerant quantum computing by 2029.
Medium-Range (One to Ten Meters): IBM and Fermilab's Superconducting Quantum Materials and Systems Centre are studying data transfer connections at greater temperatures. These connectors aim to connect quantum computers in a quantum data centre.
The hardest eyesight component is long-range (kilometres). Kilometer-long networks require a transducer to convert microwave photon energy to optical energy for transmission. To entangle over this distance, more peripherals are needed. IBM and Cisco announced a collaboration to study transducers and optical communications between QPUs to reach the ultimate quantum computing internet vision.
After QNUs that can connect QPUs across short and long distances are built, a true quantum computing internet can network QPUs across kilometres and interact with quantum sensors.
This internet of quantum computers is needed to fully utilize quantum technology. Although the journey will be difficult, IBM is hopeful about its success and the backing of its partners and clients.
