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Quantum computers that use light particles (photons) instead of electrons to transmit and process data have the promise of a new era of research in which the time needed to realize life-saving drugs and new technologies will be greatly shortened. Photons are promising candidates for quantum computing because they can spread over long distances without losing information, but when stored in matter, they become fragile and prone to decogeneration. Researchers at the Center for Advanced Research Photonics at the Center for Advanced Research (ASRC), CUNY, have developed a new protocol for storing and releasing a photon in its own built-in state ̵
1; a quantum state that is virtually unaffected by loss and decaferation. The new protocol, described in detail in the current issue of
Optica aims to accelerate the development of quantum computers.
"The goal is to store and release single photons on demand, while ensuring data stability," said Andrea Ali, founder director of the ASRC Photon Camera Initiative and Physics Professor Einstein at the Graduation Center. "Our work demonstrates that it is possible to limit and retain a single photon in an open cavity and remain there until it is prompted by another photon to continue spreading."
The research team uses quantum electrodynamics techniques to develop its theory. They explore a system consisting of an atom and a cavity – the latter of which is partially open and therefore usually allows the light captured in the system to leak out and be quickly lost. However, the research team has shown that, under certain conditions, destructive interference can prevent leakage and allow a photon to be hosted in the system indefinitely. This built-in state may be very useful for storing information without degradation, but the closed nature of this protected state also creates a barrier to external stimuli, so single photons can not be injected into the system either. The research team manages to overcome this limitation, while excite the system with two or more photons.
"We offer a system that acts as a closed box when it is excited by a photon, but opens very effectively when we hit it with two or more photons," said Mikele Kortrofo, first author of the report and post-doctor of ASRC Photonics "Our theory shows that two photons can be effectively injected into the closed system. After that, a photon will be lost and the other will be closed when the system closes. The preserved photon has the potential to be preserved in the system indefinitely. "In realistic systems, additional imperfections will prevent the perfect limitation of photons, but the research team's calculations show that their protocol outperforms previous single cavity-based solutions
. also showed that the preserved excitation photon can be released later on request by sending a second impulse from photons
The team's discovery has the potential to solve critical challenges the quantum computations, including the generation of attached photonic states and quantum memories on demand, are now being investigated for experimental verification of their theoretical work.
Physicists demonstrate a new method for creating single photons
Michele Cotrufo et al., Excitation of single-photon built-in own states in cavity-coupled systems,
(2019). DOI: 10.1364 / OPTICA.6.000799
CUNY Research Center
A new particle trap theory aims to accelerate the development of quantum computers (2019, June 24)
restored on 24 June 2019
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