Long-distance quantum chips will need more than a way to send photons between processors. Their links must create useful entanglement reliably, support accurate remote operations, work through telecom fiber, and coordinate memories, routing and error handling across many nodes. Lab demonstrations and long-fiber experiments have established important building blocks, but they have not yet shown a large, fault-tolerant distributed quantum computer.
What are “long-distance quantum chips”?
The phrase refers to a network of quantum-processing modules—small processors containing qubits—that communicate through photonic links. Rather than building one enormous chip, a system could connect separate modules so they share entanglement and perform operations distributed across nodes.
This is different from sending ordinary data, and it is different from simply transmitting an unknown quantum state intact. Loss can destroy quantum information, and it cannot be recovered by making a copy: unknown quantum states cannot be cloned. A practical architecture therefore aims to establish shared entanglement between nodes and use teleportation or quantum gate teleportation, together with classical communication, to carry out remote operations.
How do quantum computers connect over long distances?
- Create a photonic link: network nodes emit or interact with photons so that a photon-mediated event can entangle matter qubits at separate modules.
- Herald success: the system detects a signal that confirms whether the entanglement-generation attempt worked. A failed attempt must be retried; a successful link can be used for a remote operation.
- Use entanglement for a remote operation: the nodes combine the shared entanglement with local operations and classical messages to teleport a state or implement a gate between remote qubits.
- Repeat across the network: a multi-node system must preserve successful links while other links are attempted, then coordinate the resulting operations and messages.
This strategy shifts the challenge from transmitting a fragile state directly to repeatedly creating and managing entanglement. The link is useful for computing only if entanglement arrives often enough, with adequate fidelity and predictable heralding, to support remote gates and algorithms.
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What have experiments demonstrated so far?
| Experiment | Reported result | What it establishes—and what it does not |
|---|---|---|
| Two photonically interconnected trapped-ion modules, Main et al., Nature (published 5 February 2025) | Modules separated by about two metres; the team reported an 86% fidelity teleported controlled-Z gate and a 71% success rate for a distributed Grover search. Main et al., “Distributed quantum computing across an optical network link” | Shows distributed computation and heralded remote entanglement across two modules. It is a short laboratory link, not evidence of a large network operating fault-tolerantly over long distances. |
| Telecom-network nuclear-spin memory nodes, Knaut et al. (2024 preprint) | The authors reported entanglement through a 40 km low-loss telecom-fiber spool and a 35 km deployed Boston-area urban fiber loop; for the deployed-link demonstration, reported fidelity was 0.69(7). They also reported one-second entanglement storage for nuclear-spin qubits in the setup. Knaut et al., “Entanglement of Nanophotonic Quantum Memory Nodes in a Telecom Network” | Shows that memory-node entanglement can be distributed over long fiber, including installed urban fiber. This 2024 preprint describes a link experiment, not a complete multi-hop repeater chain or a distributed computer. |
These results demonstrate different pieces of the problem: a remote gate between processors and entanglement over long fiber. They should not be treated as equivalent benchmarks. The cited work does not provide a normalized, head-to-head comparison across platforms or a universal performance threshold for scaling.
What still needs to be solved before the links are useful for computing?
Higher-fidelity, repeatable remote gates
An entanglement event is not enough: errors in photon generation, transmission, detection, memory storage or local operations can reduce the accuracy of a remote gate. Algorithms compound errors across many operations, so a network needs remote operations that are both accurate and repeatable at a useful rate. The two-module gate and search results above are meaningful progress, but they also show why a small proof of principle is not the same as a practical distributed processor.
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More successful entanglement attempts under realistic loss
Photons are lost in fiber, and each unsuccessful attempt consumes time and control resources. A system that produces excellent entanglement only rarely may not supply remote gates quickly enough for computation. Increasing link availability without introducing excess noise or lowering fidelity is therefore as important as improving the quality of an individual successful event.
Why do quantum networks need telecom-compatible interfaces and repeaters?
Photons must match the fiber—and the qubits
Long-haul links benefit from telecom wavelengths because they are suited to low-loss fiber and established optical-communications technology. The qubits in a processor, however, may emit photons at a different wavelength. A network may need emitters that work directly in the telecom band or wavelength converters that translate photons from a platform’s native wavelength. Conversion must preserve the relevant quantum information while avoiding too much added loss and noise. A review by Yu et al. emphasizes the telecom-band requirement for long-haul repeater operation. Yu et al., “Telecom band quantum dot technologies for long-distance quantum networks,” NIST publication record
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Memories must hold links while the rest of the path catches up
In a multi-hop network, separate links will not necessarily succeed at the same time. Quantum memories must retain a successful link while another segment is being established, with enough lifetime and capacity to make that coordination worthwhile. Nodes also need reliable heralding, operations that combine links, and ways to detect and manage errors. A memory that stores entanglement for a useful interval is a building block; by itself, it does not demonstrate a working repeater chain.
What makes quantum chip links unreliable outside the lab?
Installed fiber is not a static laboratory component. Loss reduces the chance that photons arrive, while environmental changes can shift the optical phase or polarization of light. Those changes can undermine the interference and alignment a link depends on. The deployed-loop result in the table shows that entanglement can be distributed over operational urban fiber, but turning that into routine network service requires maintaining performance as conditions change.
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That means a deployed system needs monitoring and control for link drift, plus classical communication to coordinate heralding, timing, retries and remote operations. The quantum channel and the classical control system have to work together; reliable fiber alone does not guarantee a reliable computation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why is scaling a systems-integration problem?
Adding nodes multiplies interfaces and coordination demands. A network needs compatible photonic interfaces across processors, routing or switching for photons, stable calibration, and protocols that decide where to create entanglement, how to handle failures and when a remote operation can proceed. If nodes use different qubit technologies, their optical and control interfaces must still interoperate.
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To assess a proposed approach, compare it on the dimensions that determine whether it can grow: channel loss and entanglement rate; remote-gate fidelity and repeatability; memory lifetime, capacity and error detection; wavelength compatibility and conversion loss or noise; resilience to fiber drift; and the complexity of connecting multiple, potentially heterogeneous nodes. No single result establishes all of these capabilities at once.
What would count as real progress toward scale?
- Remote gates that are accurate and repeatable enough for longer computations, not only isolated demonstrations.
- Entanglement generation at a useful rate despite realistic channel loss.
- Telecom-compatible photon interfaces and conversion that preserve quantum information without excessive noise or loss.
- Multi-hop repeater operation with memories that can retain links, alongside reliable heralding and error management.
- Stable performance on deployed fiber as phase, polarization and environmental conditions change.
- Network controls, routing and calibration that coordinate many nodes and recover sensibly when links fail.
The field has demonstrated remote entanglement, photonic gate teleportation, long-lived memory in one system, wavelength conversion and entanglement over long fiber. What remains is to make those pieces work together with sufficient fidelity, rate and operational stability across multiple nodes. The cited work identifies engineering needs, not one agreed roadmap or a universal threshold at which a quantum network becomes scalable.
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