Researchers at the University of Oxford have recently created quantum memory in a quantum network node with
Trapped ions held byelectromagnetic fields are a widely used platform for implementing quantum computing. Photons, on the other hand, are commonly used to transfer quantum information between distant nodes. In their experiment, the researchers combine these approaches to create more powerful quantum technologies.
They entangled strontium atoms with a photon, and thenretained this entanglement in the neighboring calcium ion. Strontium-88 is ideal for generating photons to create quantum networks, the scientists explain, but it is sensitive to magnetic field noise. Calcium-43 ions, on the contrary, are insensitive to magnetic fields. As a result, the use of calcium eliminates the loss of information and increases the coherence time.
Using a combined system, researcherswere able to keep the entanglement between the memory ion and the photon for a longer time by transferring quantum information from strontium to calcium. The entanglement persisted for at least 10 s, which is at least a thousand times longer than between a single strontium ion and a photon.
With the new approach, individual quantum computing nodes can be loaded with a given number of processor qubits (e.g., calcium), and a network qubit(e.g., strontium) can then be used to create quantum connections between remote modules, noteDevelopers.
Development opens up the possibility to createscalable quantum computing systems, since the use of small modules capable of processing quantum information and their connection with other modules avoids the need for large and complex ion traps.
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