# US 2021/0341815 A1 · Quantum Optical Wavelength Converter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0341815 A1 - Document ID: US20210341815A1 - Status: Published application - Kind: A1 - Application number: 17/378,683 - Filed: 2021-07-17 - Published: 2021-11-04 - Earliest claimed: 2016-12-06 - Assignees: Notchway Solutions, LLC - Applicants: Notchway Solutions, LLC - Inventors: Katherine L. Hall; Kristin A. Rauschenbach - Web page: https://patentgrep.com/patent/US20210341815A1 ## CPC - G02F 1/3534: {Three-wave interaction, e.g. sum-difference frequency generation (G02F1/3532 takes precedence)} - G02F 1/35: Non-linear optics - G02F 1/365: in an optical waveguide structure (G02F1/377, {G02F1/395} take precedence) - G02F 2/00: Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light (G02F1/35 takes precedence) - B82Y 10/00: Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES ## Abstract An optical quantum state converter comprises an optical fiber input port configured to receive an optical signal comprising an optical quantum state at a first wavelength from an optical source. An optical combiner having a first input is coupled to the optical fiber input port. An optical pump source having an output that is coupled to a second input of the optical combiner provides an optical pump signal at a pump signal wavelength to a second input of the combiner. A nonlinear optical waveguide having an input that is coupled to an output of the optical combiner converts the optical quantum state at the first wavelength to an optical quantum state at a second wavelength determined by the optical pump signal. ## Claims ### Claim at position 1 1-26. (canceled) ### Claim 27 A method for converting a wavelength of an optical signal comprising an optical quantum state, the method comprising: a) receiving an optical signal comprising an optical quantum state with a first wavelength; b) selecting an amplitude and phase as a function of frequency of an optical pump signal spectrum at a pump signal wavelength to form an optical pump signal that will convert a spectra of the optical signal comprising the optical quantum state to a desired spectra; c) combining the received optical signal comprising the optical quantum state with the first wavelength and the selected optical pump signal, thereby forming a combined optical signal; d) propagating the combined optical signal through a nonlinear optical waveguide that converts the optical quantum state with the first wavelength to an optical quantum state at a second wavelength; and e) filtering the combined optical signal to suppress at least some of the optical pump signal to a desired residual pump level and to preserve a quantum property of the converted optical quantum state at the second wavelength. ### Claim 28 (canceled) ### Claim 29 (canceled) ### Claim 30 (canceled) ### Claim 31 (canceled) ### Claim 32 (canceled) ### Claim 33 (canceled) ### Claim 34 (depends on 27) The method of claim 27 wherein the first wavelength is a wavelength in a range of 760 nm to 800 nm and the amplitude and phase as a function of frequency of the optical pump signal spectrum is selected so that the second wavelength is a wavelength in a range of 1445 nm to 1605 nm. ### Claim 35 (depends on 27) The method of claim 27 wherein the first wavelength is a wavelength in a range of 1445 nm to 1605 nm and the amplitude and phase as a function of frequency of the optical pump signal spectrum is selected so that the second wavelength is a wavelength in a range of 760 nm to 800 nm. ### Claim 36 (depends on 27) The method of claim 27 wherein the selecting the amplitude and phase as a function of frequency of the optical pump signal spectrum that will convert a spectra of the optical signal comprising the optical quantum state to a desired spectra comprises selecting an optical pump signal spectrum with a tunable optical pump source. ### Claim 37 (depends on 27) The method of claim 27 wherein the selecting the optical pump signal spectrum that will convert a spectra of the optical signal comprising the optical quantum state to a desired spectra further comprises linearly chirping the pump signal spectrum. ### Claim 38 (depends on 27) The method of claim 27 wherein the nonlinear optical waveguide narrows the optical spectrum of the converted optical quantum state with the second wavelength. ### Claim 39 (canceled) ### Claim 40 (canceled) ### Claim 41 (canceled) ### Claim 42 (depends on 27) The method of claim 27 wherein the propagating the combined optical signal through the nonlinear optical waveguide comprises propagating the combined optical signal through a tunable nonlinear optical waveguide. ### Claim 43 (canceled) ### Claim 44 (canceled) ### Claim 45 (canceled) ### Claim 46 (canceled) ### Claim 47 (depends on 27) The method of claim 27 wherein the filtering suppresses at least some of the optical pump signal to a level that is greater than 90 dB. ### Claim 48 An optical quantum state converter comprising: a) an optical pump source comprising a dispersive element and a spatial light modulator that provides an optical pump signal having an amplitude and phase as a function of frequency at a pump optical signal wavelength to an output; b) an optical combiner having a first input configured to receive an optical signal comprising an optical quantum state at a first wavelength and a second input coupled to the output of the optical pump source; c) a nonlinear optical waveguide having an input that is coupled to an output of the optical combiner, the nonlinear optical waveguide converting the optical quantum state at the first wavelength to an optical quantum state at a second wavelength, wherein the amplitude and phase as the function of frequency of the optical pump signal is chosen to convert a spectra of the optical signal comprising the optical quantum state to a desired spectra; and d) a filter having an input coupled to the output of the nonlinear optical waveguide, the filter suppressing at least some of the optical pump signal to a desired residual pump level and preserving a quantum property of the converted optical quantum state at the second wavelength. ### Claim 49 (canceled) ### Claim 50 (depends on 48) The optical quantum state converter of claim 48 wherein the optical source comprises a single-photon optical source, a quantum memory, an optical logic gate, or an optical fiber transport system. ### Claim 51 (canceled) ### Claim 52 (canceled) ### Claim 53 (canceled) ### Claim 54 (canceled) ### Claim 55 (canceled) ### Claim 56 (canceled) ### Claim 57 (canceled) ### Claim 58 (canceled) ### Claim 59 (depends on 48) The optical quantum state converter of claim 48 wherein the optical pump source is configured to generate an optical spectrum having a linearly chirped spectrum. ### Claim 60 (depends on 48) The optical quantum state converter of claim 48 wherein the desired spectra of the optical quantum state at the second wavelength has a linewidth that is in a range of 1-1000 kHz ### Claim 61 (canceled) ### Claim 62 (canceled) ### Claim 63 (canceled) ### Claim 64 (canceled) ### Claim 65 (canceled) ### Claim 66 (canceled) ### Claim 67 (canceled) ### Claim 68 (depends on 48) The optical quantum state converter of claim 48 wherein the optical filter is configured to suppress the tunable optical pump signal to a level that is greater than 90 dB. ### Claim 69 (canceled) ### Claim 70 (canceled) ### Claim 71 (canceled) ### Claim 72 (canceled) ### Claim 73 (canceled) ### Claim 74 (canceled) ### Claim 75 (canceled) ### Claim 76 (canceled) ### Claim 77 (canceled) ### Claim 78 (canceled) ### Claim 79 (canceled) ### Claim 80 A method for converting a wavelength of an optical signal comprising an optical quantum state, the method comprising: a) receiving an optical signal comprising an optical quantum state with a first wavelength; b) selecting an amplitude and phase as a function of frequency of an optical pump signal spectrum at a pump signal wavelength to form an optical pump signal having a chirp magnitude and sign that will convert a spectra of the optical signal comprising the optical quantum state to a spectra having a desired bandwidth; c) combining the received optical signal comprising the optical quantum state with the first wavelength and the selected optical pump signal, thereby forming a combined optical signal; d) propagating the combined optical signal through a nonlinear optical waveguide that converts the optical quantum state with the first wavelength to an optical quantum state at a second wavelength; and e) filtering the combined optical signal to suppress at least some of the optical pump signal to a desired residual pump level and to preserve a quantum property of the converted optical quantum state at the second wavelength. ### Claim 81 (depends on 80) The method of claim 80 wherein the converted spectra has the desired bandwidth and a desired phase. ### Claim 82 (depends on 80) The method of claim 80 wherein the nonlinear optical waveguide narrows the optical spectrum of the converted optical quantum state with the second wavelength. ### Claim 83 (depends on 80) The method of claim 80 wherein the propagating the combined optical signal through the nonlinear optical waveguide comprises propagating the combined optical signal through a tunable nonlinear optical waveguide. ### Claim 84 The optical quantum state converter of 48 wherein the nonlinear optical waveguide comprises a periodically poled waveguide. ### Claim 85 (depends on 42) The method of claim 42 wherein the preserving the quantum property of the converted optical quantum state at the second wavelength comprises preserving at least one of entanglement, phase coherence, or photon statistics. ### Claim 86 The optical quantum state converter of 48 wherein the optical pump source provides a continuous wave optical pump signal.