以下是為大家整理的關于《英語科普：芯片量子計算的新方法》文章，供大家學習參考！
小編推薦： 英文歌詞| 英文網(wǎng)名| 英語祝福語| 英文名字| 英語詩歌| 英語作文網(wǎng)
Commercial devices capable of encrypting information in unbreakable codes exist today, thanks to recent quantum optics advances, especially the generation of photon pairs -- tiny entangled1 particles of light. Now, an international team of researchers led by professor Roberto Morandotti of INRS-EMT in Canada, is introducing a new method to achieve a different type of photon pair source that fits into the tiny space of a computer chip. The team's method, which generates "mixed up" photon pairs from devices that are less than one square millimeter in area, could form the core of the next-generation of quantum optical communication and computing2 technology. The research will be presented at The Optical Society's (OSA) 98th Annual Meeting, Frontiers in Optics, being held Oct. 19-23 in Tucson, Arizona, USA.
One of the properties of light exploited within quantum optics is "photon polarization," which is essentially3 the direction in which the electric field associated with the photon oscillates. The research team set out to find a way to directly "mix up," or cross-polarize, the photons via a nonlinear optical process on a chip.
"While several efforts have been devoted4 to develop on-chip sources of polarization-entangled photons, the process typically used to generate these photons only allows the generation of photons with the same polarization as the laser beam used to pump the device -- either both horizontal or vertical5 -- after which entanglement6 can be achieved by accurately7 mixing these states. Now, we have found a way to directly generate cross-polarized photon pairs," says Lucia Caspani, a postdoctoral fellow at INRS-EMT and co-author of the Frontiers in Optics paper.
To generate the cross-polarized photons, Caspani and colleagues used two different laser beams at different wavelengths8 -- one vertically9 polarized and another horizontally polarized. The approach, however, came with a potential pitfall10: the classical process between the two pump beams could destroy the photons' fragile quantum state.
To address this challenge, the team, which also includes researchers from RMIT University in Australia and City University of Hong Kong, pioneered a new approach based on a micro-ring resonator -- a tiny optical cavity with a diameter on the order of tens to hundreds of micrometers -- that operates in such a way that energy conservation constraints11 suppress classical effects while amplifying12 quantum processes.
While a similar suppression of classical effects has been observed in gas vapors13 and complex micro-structured fibers14, this is the first time it has been reported on a chip, thus opening a clear route for building scalable integrated devices.
"Our approach opens the door to directly mixing different polarizations on a chip," Caspani points out. "At very low power, our device directly generates photon pairs with orthogonal polarizations, which can be exploited for quantum communication and computing protocols15."
The fabrication process of the chip is also compatible with that currently used for electronic chips. "It enables a future coexistence of our device with standard integrated circuits," says Caspani, which is a fundamental requirement for the widespread adoption16 of optical quantum technologies.
Presentation FTu2A.2, "Direct Generation of Orthogonally Polarized Photon Pairs via Spontaneous Non-Degenerate FWM on a Chip," takes place Oct. 21 in Tucson.
小編推薦： 英文歌詞| 英文網(wǎng)名| 英語祝福語| 英文名字| 英語詩歌| 英語作文網(wǎng)
Commercial devices capable of encrypting information in unbreakable codes exist today, thanks to recent quantum optics advances, especially the generation of photon pairs -- tiny entangled1 particles of light. Now, an international team of researchers led by professor Roberto Morandotti of INRS-EMT in Canada, is introducing a new method to achieve a different type of photon pair source that fits into the tiny space of a computer chip. The team's method, which generates "mixed up" photon pairs from devices that are less than one square millimeter in area, could form the core of the next-generation of quantum optical communication and computing2 technology. The research will be presented at The Optical Society's (OSA) 98th Annual Meeting, Frontiers in Optics, being held Oct. 19-23 in Tucson, Arizona, USA.
One of the properties of light exploited within quantum optics is "photon polarization," which is essentially3 the direction in which the electric field associated with the photon oscillates. The research team set out to find a way to directly "mix up," or cross-polarize, the photons via a nonlinear optical process on a chip.
"While several efforts have been devoted4 to develop on-chip sources of polarization-entangled photons, the process typically used to generate these photons only allows the generation of photons with the same polarization as the laser beam used to pump the device -- either both horizontal or vertical5 -- after which entanglement6 can be achieved by accurately7 mixing these states. Now, we have found a way to directly generate cross-polarized photon pairs," says Lucia Caspani, a postdoctoral fellow at INRS-EMT and co-author of the Frontiers in Optics paper.
To generate the cross-polarized photons, Caspani and colleagues used two different laser beams at different wavelengths8 -- one vertically9 polarized and another horizontally polarized. The approach, however, came with a potential pitfall10: the classical process between the two pump beams could destroy the photons' fragile quantum state.
To address this challenge, the team, which also includes researchers from RMIT University in Australia and City University of Hong Kong, pioneered a new approach based on a micro-ring resonator -- a tiny optical cavity with a diameter on the order of tens to hundreds of micrometers -- that operates in such a way that energy conservation constraints11 suppress classical effects while amplifying12 quantum processes.
While a similar suppression of classical effects has been observed in gas vapors13 and complex micro-structured fibers14, this is the first time it has been reported on a chip, thus opening a clear route for building scalable integrated devices.
"Our approach opens the door to directly mixing different polarizations on a chip," Caspani points out. "At very low power, our device directly generates photon pairs with orthogonal polarizations, which can be exploited for quantum communication and computing protocols15."
The fabrication process of the chip is also compatible with that currently used for electronic chips. "It enables a future coexistence of our device with standard integrated circuits," says Caspani, which is a fundamental requirement for the widespread adoption16 of optical quantum technologies.
Presentation FTu2A.2, "Direct Generation of Orthogonally Polarized Photon Pairs via Spontaneous Non-Degenerate FWM on a Chip," takes place Oct. 21 in Tucson.