Good news!
"Researchers in Austria have entangled matter-based qubits with photonic qubits in a ten-ion system. The technique is scalable to larger ion-qubit registers, paving the way for the creation of larger and more complex quantum networks. ..."
"... To make such a network possible, so-called quantum network nodes — that can store quantum information and share it via light particles – are needed. In their latest work, the ... team ... demonstrated such a node using a string of ten calcium ions in a prototype quantum computer. By carefully adjusting electric fields, the ions were moved one by one into an optical cavity. There, a finely tuned laser pulse triggered the emission of a single photon whose polarization was entangled with the ion’s state. ..."
From the abstract:
"Establishing networks of quantum processors offers a path to scalable quantum computing and applications in communication and sensing. This requires first developing efficient interfaces between photons and multiqubit registers.
In this Letter, we show how to entangle each individual matter qubit in a register of ten to a separate traveling photon. The qubits are encoded in a string of cotrapped atomic ions.
By switching the trap confinement, ions are brought one at a time into the waist of an optical cavity and emit a photon via a laser-driven cavity-mediated Raman transition.
The result is a train of photonic qubits, each near-maximally entangled by their polarization with a different ion qubit in the string. An average ion-photon Bell state fidelity of 92% is achieved, for an average probability for detecting each single photon of 9%.
The technique is directly scalable to larger ion-qubit registers and opens up the near-term possibility of entangling distributed networks of trapped-ion quantum processors, sensing arrays, and clocks."
Powerful nodes for quantum networks (original news release) "Researchers at the University of Innsbruck have created a system in which individual qubits — stored in trapped calcium ions — are each entangled with separate photons. Demonstrating this method for a register of up to 10 qubits, the team has shown an easily scalable approach that opens new possibilities for linking quantum computers and quantum sensors."
Photon-Interfaced Ten-Qubit Register of Trapped Ions (open access)
One by one, each ion-qubit is moved into an optical cavity, where mirrors efficiently collect the photons emitted by the ion-qubit. Each photon emerges entangled with its ion-qubit, forming a deep quantum link.
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