NVision reports single-molecule qubit with a photonic interface in Nature, teams with HyperLight
NVision's Nature paper shows a single carbene molecule acting as an addressable spin–photon interface; the company will integrate the qubits on HyperLight TFLN chips.
Ulm-based NVision has published a peer-reviewed paper in Nature showing that a single organic molecule can be prepared, controlled and read out as a spin qubit with an optical interface. Alongside the paper, the company announced a partnership with HyperLight to place these molecular qubits on thin-film lithium niobate (TFLN) photonic integrated circuits, with first prototype chips expected in the fourth quarter of 2026.
What the paper shows
The open-access paper, A single-molecule spin–photon interface, was published on 28 October 2026 by researchers from NVision Quantum Technologies, Ulm University and the Hebrew University of Jerusalem. The qubit is a carbene molecule with a triplet ground state, embedded in a host crystal made of a structurally matched ketone. Light is used to activate, initialize and read out the spin, and microwaves drive it.
At 4.5 K, the team reports:
- photon statistics consistent with a single emitter, with a measured g⁽²⁾(0) of about 0.14;
- an optical linewidth of 38 MHz for a single molecule, with line positions drifting by only about 2.4–2.6 MHz (standard deviation) over more than an hour;
- spin coherence of 2.2 ms under XY8 dynamical decoupling and a spin relaxation time of 21 ms.
The authors write that these single-molecule spin values improve on earlier ensemble results for molecular qubits by more than an order of magnitude. They estimate a combined emission efficiency into the zero-phonon line of about 2.1%, which they describe as comparable to the nitrogen-vacancy centre in diamond. The paper's competing-interests statement notes that most authors are NVision employees and that several are shareholders.
The HyperLight partnership
According to the joint announcement, the companies will deposit NVision's molecular qubits as a thin film directly onto HyperLight's TFLN photonic chips, extending HyperLight's TFLN Chiplet technology into quantum hardware. The paper itself points to this route, noting that the molecules can be processed into ultrathin films and placed on prefabricated photonic circuits made from materials such as lithium niobate.
Kevin Luke, HyperLight co-founder and head of custom development, said photonic interconnectivity "is essential for scaling quantum processors."
NVision's roadmap claims
NVision says it screened more than 150 candidate molecules computationally and synthesized 40 to arrive at the carbene system. The company is targeting a live demonstration of on-chip performance on photonic chips by the end of 2026. Its longer-term plan, as stated in the announcement, is 1,000 physical qubits and then progress toward 1,000 logical, fault-tolerant qubits on chip by 2030. NVision also says its architecture tolerates up to 70% photon loss. These roadmap and loss-tolerance figures are company statements and are not part of the peer-reviewed paper.
In a company blog post, NVision explains that in its PIQC architecture the electron spin serves as the light interface. Nuclear spins built into the same molecule are meant to act as long-lived memories. The Nature paper demonstrates the electron-spin role.
Why it matters
The paper describes solid-state defects, such as colour centres in diamond, as today's leading spin–photon interfaces. A chemically designed molecule that can be made in identical copies and deposited on standard photonic chips would offer a different way to build networked quantum processors. This is still an early single-molecule demonstration at 4.5 K. The authors point to further work on brightness, quantum yield and operating temperature, and to nuclear-spin memories for longer storage.
What to watch
The next milestones to watch are the first NVision–HyperLight prototype chips and whether NVision can show on-chip operation of molecular qubits before the end of 2026, as it has said it will.
Sources
Facts on this page come from the sources below, retrieved by DesignQuantum.