Title:
QUANTUM CIRCUIT, QUANTUM COMPUTER, AND METHOD FOR PRODUCING QUANTUM CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2022/118366
Kind Code:
A1
Abstract:
This method for producing a quantum circuit comprises a step for forming, in a diamond layer having a first principal surface and a second principal surface and including a color center, an optical waveguide to be optically coupled to the color center, the optical waveguide has a core region including the color center, and an optical confinement region provided around the core region, and the refractive index of the optical confinement region is lower than the refractive index of the core region. The step for forming the optical waveguide comprises: a step for forming, in the diamond layer, an inclined surface separate from the color center; a step for forming a reflection film on the inclined surface; a step for forming a first region on the first principal surface side of the color center by irradiating a part of the reflection film with femtosecond laser light, and reducing the refractive index of a part of the diamond layer by concentrating the femtosecond laser light reflected by the reflection film onto the first principal surface side of the color center; a step for forming a second region on the second principal surface side of the color center by irradiating another part of the reflection film with femtosecond layer light, and reducing the refractive index of another part of the diamond layer by concentrating the femtosecond laser light reflected by the reflection film onto the second principal surface side of the color center; a step for forming a third region on one side of the core region in a first direction parallel to the first principal surface by irradiating a part of the first principal surface with femtosecond laser light, and reducing the refractive index of another part of the diamond layer by concentrating the femtosecond laser light onto the one side of the core region; and a step for forming a fourth region on the other side of the core region in the first direction by irradiating another part of the first principal surface with femtosecond laser light, and reducing the refractive index of another part of the diamond layer by concentrating the femtosecond laser light onto the other side of the core region.
Inventors:
MIYATAKE TETSUYA (JP)
Application Number:
PCT/JP2020/044622
Publication Date:
June 09, 2022
Filing Date:
December 01, 2020
Export Citation:
Assignee:
FUJITSU LTD (JP)
International Classes:
G02B6/122; G02B6/13
Foreign References:
| JP2005538392A | 2005-12-15 | |||
| JP2003506731A | 2003-02-18 | |||
| US9157859B2 | 2015-10-13 | |||
| US8837534B2 | 2014-09-16 | |||
| JP2013544441A | 2010-12-17 |
Other References:
SOTILLO BELÉN, BHARADWAJ VIBHAV, HADDEN J. P., SAKAKURA MASAAKI, CHIAPPINI ANDREA, FERNANDEZ TONEY TEDDY, LONGHI STEFANO, JEDRKIEW: "Diamond photonics platform enabled by femtosecond laser writing", SCIENTIFIC REPORTS, vol. 6, no. 35566, 17 October 2016 (2016-10-17), pages 1 - 9, XP055942206
HANAFI HAISSAM, KROESEN SEBASTIAN, LEWES-MALANDRAKIS GEORGIA, NEBEL CHRISTOPH, PERNICE WOLFRAM H. P., DENZ CORNELIA: "Polycrystalline diamond photonic waveguides realized by femtosecond laser lithography", OPTICAL MATERIALS EXPRESS, vol. 9, no. 7, 24 June 2019 (2019-06-24), pages 3109 - 3114, XP055942211
BOOTH MARTIN J; SALTER PATRICK S: "Dynamic optical laser fabrication for engineering of quantum photonic devices", QUANTUM SENSING AND NANO ELECTRONICS AND PHOTONICS XVI, vol. 10926, 1 February 2019 (2019-02-01), pages 10926Y - 1-10926Y-6, XP060119528
HADDEN J. P., BHARADWAJ V., SOTILLO B., RAMPINI S., OSELLAME R., WITMER J. D., JAYAKUMAR H., FERNANDEZ T. T., CHIAPPINI A., ARMELL: "Integrated waveguides and deterministically positioned nitrogen vacancy centers in diamond created by femtosecond laser writing", OPTICS LETTERS, vol. 43, no. 15, 1 August 2018 (2018-08-01), pages 3586 - 3589, XP081149571
"Integrated waveguides and deterministically positioned nitrogen vacancy centers in diamond created by femtosecond laser writing", OPTICS LETTERS, vol. 43, no. 15, 2018, pages 3586 - 3589
"Diamond photonics platform enabled by femtosecond laser writing", SCIENTIFIC REPORTS, vol. 6, 2016, pages 35566
See also references of EP 4258029A4
HANAFI HAISSAM, KROESEN SEBASTIAN, LEWES-MALANDRAKIS GEORGIA, NEBEL CHRISTOPH, PERNICE WOLFRAM H. P., DENZ CORNELIA: "Polycrystalline diamond photonic waveguides realized by femtosecond laser lithography", OPTICAL MATERIALS EXPRESS, vol. 9, no. 7, 24 June 2019 (2019-06-24), pages 3109 - 3114, XP055942211
BOOTH MARTIN J; SALTER PATRICK S: "Dynamic optical laser fabrication for engineering of quantum photonic devices", QUANTUM SENSING AND NANO ELECTRONICS AND PHOTONICS XVI, vol. 10926, 1 February 2019 (2019-02-01), pages 10926Y - 1-10926Y-6, XP060119528
HADDEN J. P., BHARADWAJ V., SOTILLO B., RAMPINI S., OSELLAME R., WITMER J. D., JAYAKUMAR H., FERNANDEZ T. T., CHIAPPINI A., ARMELL: "Integrated waveguides and deterministically positioned nitrogen vacancy centers in diamond created by femtosecond laser writing", OPTICS LETTERS, vol. 43, no. 15, 1 August 2018 (2018-08-01), pages 3586 - 3589, XP081149571
"Integrated waveguides and deterministically positioned nitrogen vacancy centers in diamond created by femtosecond laser writing", OPTICS LETTERS, vol. 43, no. 15, 2018, pages 3586 - 3589
"Diamond photonics platform enabled by femtosecond laser writing", SCIENTIFIC REPORTS, vol. 6, 2016, pages 35566
See also references of EP 4258029A4
Attorney, Agent or Firm:
ITOH, Tadashige et al. (JP)
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