Science & Technology

A New Possibility for Storing and Processing Quantum Information

Reminiscence candidate with a vivid future: Max Planck researchers have addressed particular person praseodymium ions within the crystal of an yttrium orthosilicate utilizing resourceful microscopy and laser applied sciences. This opens up the opportunity of storing quantum data in these ions, which have a number of benefits in comparison with different reminiscence candidates. Credit score: MPI for the Science of Gentle

Scientists from the Max Planck Institute have succeeded in performing high-resolution spectroscopy and microscopy on particular person uncommon earth ions in a crystal, opening the door to future potentialities for storing and processing quantum data.

A promising materials is lining itself up as a candidate for a quantum reminiscence. A crew on the Max Planck Institute for the Science of Gentle in Erlangen is the primary to achieve performing high-resolution spectroscopy and microscopy on particular person uncommon earth ions in a crystal. With assistance from ingenious laser and microscopy know-how they decided the place of triply charged constructive praseodymium atoms (Pr3+) in an yttrium orthosilicate to inside a couple of nanometers and investigated their weak interplay with mild. Along with its impression on basic research, the work could make an vital contribution to the quantum computer systems of the longer term as a result of the ions investigated are appropriate for storing and processing quantum data.

Across the globe, quite a few researchers are engaged on elements for the quantum computer systems of the longer term, which can have the ability to course of data considerably sooner than at the moment. The important thing parts of those super-computers embrace quantum programs with optical properties much like these of an atom. Because of this many researchers are at present focusing their consideration on totally different programs corresponding to light-emitting crystal defects (“coloration facilities”) in diamond or on semiconductor quantum dots. Nonetheless, to date there was no best resolution. “A number of the mild sources lose their brightness or flicker in an uncontrollable method,” explains Vahid Sandoghdar, who heads the Nano-Optics Division on the Max Planck Institute for the Science of Gentle in Erlangen. “Others are significantly affected by the surroundings into which they’re embedded.”

Researchers observe the indicators of a person ion

It has lengthy been recognized that the uncommon earth ions corresponding to neodymium or erbium don’t endure from these issues – which can also be why they play a key position in lasers or laser amplifiers. They emit solely weakly, nonetheless, and are subsequently tough to detect. That is exactly what Tobias Utikal, Emanuel Eichhammer and Stephan Götzinger from Sandoghdar’s Group in Erlangen have succeeded to do: after greater than six years of intensive analysis they have been capable of detect particular person praseodymium ions, pinpoint them with an accuracy of some nanometers, and measure their optical properties with an accuracy by no means achieved earlier than.

The triply charged, constructive ions have been embedded in tiny microcrystals and nanocrystals of yttrium orthosilicate (YSO). Their energies various solely barely relying on their place within the crystal. In different phrases, they reacted to barely totally different frequencies. The scientists used this to excite particular person ions within the crystals with a laser and to look at how they emit the power after a while in type of mild. “As a result of uncommon earth ions are usually not strongly affected by the thermal and acoustic oscillations of the crystal, a few of their power states are unusually steady,” says Sandoghdar. “It takes greater than a minute earlier than they make the transition into the bottom state once more – 1,000,000 instances longer than for a lot of the different quantum programs which were investigated to date.”

The purpose is for the indicators of the ions to be even simpler to look at sooner or later. Since a person ion responds with lower than 100 photons per second in the meanwhile, the Erlangen-based scientists wish to make use of nano-antennas and microcavities to amplify the praseodymium sign by 100 or a thousand instances.

Publication: T. Utikal, et al., “Spectroscopic detection and state preparation of a single praseodymium ion in a crystal,” Nature Communications 5, Article quantity: 3627; doi:10.1038/ncomms4627

PDF Copy of the Examine: Detection, spectroscopy and state preparation of a single praseodymium ion in a crystal

Picture: MPI for the Science of Gentle

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