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Communications of the ACM

ACM TechNews

Improved Interface For a Quantum Internet

A quantum network requires efficient interfaces over which information can be transferred from matter to light and back.

Two particles are positioned between highly reflective mirrors and entangled with one another by means of a laser. Additional lasers encode quantum information in the ions and then transfer the information to a single photon.

Credit: University of Innsbruck

University of Innsbruck researchers have improved an interface between quantum processors and optical fiber-based communication channels, making use of so-called superradiant states.

"In our interface, we position two ions between two highly reflective mirrors, which form an optical resonator," says University of Innsbruck researcher Tracy Northup. "We entangle the ions with one another and couple both of them to the resonator." She says this process enables the collective interaction between the particles and the resonator to be tuned in order to enhance the creation of single photons.

The researchers demonstrated the interface is suitable for quantum information processing by encoding a quantum state in the entangled particles, and then transferring this state onto a single photon.

"Thanks to superradiance, the process of information transfer from the particle to the photon essentially becomes more robust," says University of Innsbruck researcher Bernardo Casabone.

The researchers also were able to create subradiant states, in which the emission of a photon is suppressed rather than enhanced. "These states are also interesting because the stored information becomes invisible to the resonator, and in that sense, it's protected," Northup says.

From University of Innsbruck
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