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公开(公告)号：US20220146322A1
公开(公告)日：2022-05-12
申请号：US17400047
申请日：2021-08-11
Inventor： Kin Chung FONG , Dirk Robert Englund
Abstract: An evaporatively cooled device and a system including the same. In some embodiments, the system includes an oligolayer conductive sheet; a superconductor; a tunneling barrier, between the oligolayer conductive sheet and the superconductor; and a bias circuit, configured to apply a bias voltage across the tunneling barrier, the bias voltage being less than a gap voltage of the superconductor and greater than one-half of the gap voltage of the superconductor.
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公开(公告)号：US10649306B2
公开(公告)日：2020-05-12
申请号：US16284161
申请日：2019-02-25
Applicant: Massachusetts Institute of Technology
Inventor： Scott A. Skirlo , Cheryl Marie Sorace-Agaskar , Marin Soljacic , Simon Verghese , Jeffrey S. Herd , Paul William Juodawlkis , Yi Yang , Dirk Robert Englund , Mihika Prabhu
Abstract: An integrated optical beam steering device includes a planar dielectric lens that collimates beams from different inputs in different directions within the lens plane. It also includes an output coupler, such as a grating or photonic crystal, that guides the collimated beams in different directions out of the lens plane. A switch matrix controls which input port is illuminated and hence the in-plane propagation direction of the collimated beam. And a tunable light source changes the wavelength to control the angle at which the collimated beam leaves the plane of the substrate. The device is very efficient, in part because the input port (and thus in-plane propagation direction) can be changed by actuating only log2 N of the N switches in the switch matrix. It can also be much simpler, smaller, and cheaper because it needs fewer control lines than a conventional optical phased array with the same resolution.
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公开(公告)号：US11956017B2
公开(公告)日：2024-04-09
申请号：US17412877
申请日：2021-08-26
Applicant: Massachusetts Institute of Technology
Inventor： Eric Alexander Bersin , Carlos Errando Herranz , Dirk Robert Englund
CPC classification number: H04B10/29 , G02F1/353 , G02F1/3551 , H04B10/70
Abstract: A spectrally multiplexed quantum repeater (SMuQR) based on spatially arrayed nodes of frequency-multiplexed multi-qubit registers uses the natural inhomogeneous distribution of optical transition frequencies in solid state defect centers. This distribution enables spectrally selective, individual addressing of large numbers of defect centers within an optical diffraction limited spot along a long cavity or waveguide. The spectral selection relies on frequency shifting an incident optical field at a rate as fast as once per defect center lifetime. The defect centers are resonant at visible frequencies and emit visible single photons which are down-converted to a wavelength compatible with long-distance transmission via conventional optical fiber. The down-converted photons are all at the same telecommunications wavelength, with the different spectral bins mapped to different temporal bins to preserve the multiplexing in the time domain, for distribution to other nodes in the quantum network.
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公开(公告)号：US11635330B2
公开(公告)日：2023-04-25
申请号：US17335017
申请日：2021-05-31
Applicant: Massachusetts Institute of Technology
Inventor： Jordan Goldstein , Christopher Louis Panuski , Dirk Robert Englund
IPC: G01J5/08 , G01J5/0818 , G01J5/34
Abstract: Optical microcavity resonance measurements can have readout noise matching the fundamental limit set by thermal fluctuations in the cavity. Small-heat-capacity, wavelength-scale microcavities can be used as bolometers that bypass the limitations of other bolometer technologies. The microcavities can be implemented as photonic crystal cavities or micro-disks that are thermally coupled to strong mid-IR or LWIR absorbers, such as pyrolytic carbon columns. Each microcavity and the associated absorber(s) rest on hollow pillars that extend from a substrate and thermally isolate the cavity and the absorber(s) from the rest of the bolometer. This ensures that thermal transfer to the absorbers is predominantly from radiation as opposed to from conduction. As the absorbers absorb thermal radiation, they shift the resonance wavelength of the cavity. The cavity transduces this thermal change into an optical signal by reflecting or scattering more (or less) near-infrared (NIR) probe light as a function of the resonance wavelength shift.
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公开(公告)号：US11586152B2
公开(公告)日：2023-02-21
申请号：US17504238
申请日：2021-10-18
Applicant: Massachusetts Institute of Technology
Inventor： Matthew Edwin Trusheim , Kurt Jacobs , Jonathan Hoffman , Donald Fahey , Dirk Robert Englund
Abstract: An ensemble of spin defect centers or other atom-like quantum systems in a solid-state host can be used as a compact alternative for an atomic clock thanks to an architecture that overcomes magnetic and temperature-induced systematics. A polariton-stabilized solid-state spin clock hybridizes a microwave resonator with a magnetic-field-insensitive spin transition within the ground state of a spin defect center (e.g., a nitrogen vacancy center in diamond). Detailed numerical and analytical modeling of this polariton-stabilized solid-state spin clock indicates a potential fractional frequency instability below 10−13 over a 1-second measurement time, assuming present-day experimental parameters. This stability is a significant improvement over the state-of-the-art in miniaturized atomic vapor clocks.
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Patent Agency Ranking
16.发明授权公开(公告)号：US11448939B2
公开(公告)日：2022-09-20
申请号：US17384861
申请日：2021-07-26
Applicant: Massachusetts Institute of Technology
Inventor： Hyeongrak Choi , Dirk Robert Englund
Abstract: It remains a challenge to generate coherent radiation in the spectral range of 0.1-10 THz (“the THz gap”), a band for applications ranging from spectroscopy to security and high-speed wireless communications. Here, we disclose how to produce coherent radiation spanning the THz gap using efficient second-harmonic generation (SHG) in low-loss dielectric structures, starting from an electronic oscillator (EO) that generates coherent radiation at frequencies of about 100 GHz. The EO is coupled to cascaded, hybrid THz-band dielectric cavities that combine (1) extreme field concentration in high-quality-factor resonators with (2) nonlinear materials enhanced by phonon resonances. These cavities convert the input radiation into higher-frequency coherent radiation at conversion efficiencies of >103%/W, making it possible to bridge the THz gap with 1 W of input power. This approach enables efficient, cascaded parametric frequency converters, representing a new generation of light sources extensible into the mid-IR spectrum and beyond.
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17.发明授权公开(公告)号：US11054590B1
公开(公告)日：2021-07-06
申请号：US16734727
申请日：2020-01-06
Applicant: Massachusetts Institute of Technology
Inventor： Noel Wan , Jacques Johannes Carolan , Tsung-Ju Lu , Ian Robert Christen , Dirk Robert Englund
IPC: G02B6/42
Abstract: A process is provided for the high-yield heterogeneous integration of ‘quantum micro-chiplets’ (QMCs, diamond waveguide arrays containing highly coherent color centers) with an aluminum nitride (AlN) photonic integrated circuit (PIC). As an example, the process is useful for the development of a 72-channel defect-free array of germanium-vacancy (GeV) and silicon-vacancy (SiV) color centers in a PIC. Photoluminescence spectroscopy reveals long-term stable and narrow average optical linewidths of 54 MHz (146 MHz) for GeV (SiV) emitters, close to the lifetime-limited linewidth of 32 MHz (93 MHz). Additionally, inhomogeneities in the individual qubits can be compensated in situ with integrated tuning of the optical frequencies over 100 GHz. The ability to assemble large numbers of nearly indistinguishable artificial atoms into phase-stable PICs is useful for development of multiplexed quantum repeaters and general-purpose quantum computers.
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公开(公告)号：US10648933B2
公开(公告)日：2020-05-12
申请号：US16232137
申请日：2018-12-26
Applicant: Massachusetts Institute of Technology
Inventor： Hannah A. Clevenson , Dirk Robert Englund
Abstract: A light-trapping geometry enhances the sensitivity of strain, temperature, and/or electromagnetic field measurements using nitrogen vacancies in bulk diamond, which have exterior dimensions on the order of millimeters. In an example light-trapping geometry, a laser beam enters the bulk diamond, which may be at room temperature, through a facet or notch. The beam propagates along a path inside the bulk diamond that includes many total internal reflections off the diamond's surfaces. The NVs inside the bulk diamonds absorb the beam as it propagates. Photodetectors measure the transmitted beam or fluorescence emitted by the NVs. The resulting transmission or emission spectrum represents the NVs' quantum mechanical states, which in turn vary with temperature, magnetic field strength, electric field strength, strain/pressure, etc.
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19.发明授权公开(公告)号：US10126506B2
公开(公告)日：2018-11-13
申请号：US15486088
申请日：2017-04-12
Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Inventor： Jacob C. Mower , Jelena Notaros , Mikkel Heuck , Dirk Robert Englund , Cosmo Lupo , Seth Lloyd
Abstract: A large-scale tunable-coupling ring array includes an input waveguide coupled to multiple ring resonators, each of which has a distinct resonant wavelength. The collective effect of these multiple ring resonators is to impart a distinct time delay to a distinct wavelength component (or frequency component) in an input signal, thereby carrying out quantum scrambling of the input signal. The scrambled signal is received by a receiver also using a large-scale tunable-coupling ring array. This receiver-end ring resonator array recovers the input signal by imparting a compensatory time delay to each wavelength component. Each ring resonator can be coupled to the input waveguide via a corresponding Mach Zehnder interferometer (MZI). The MZI includes a phase shifter on at least one of its arms to increase the tunability of the ring array.
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20.发明授权公开(公告)号：US09709440B2
公开(公告)日：2017-07-18
申请号：US14325502
申请日：2014-07-08
Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Inventor： Dirk Robert Englund , Edward H. Chen , Fan Meng , Tim Schroder , Noel Heng Loon Wang , Ren-Jye Shiue
CPC classification number: G01J3/0205 , G01J3/0218 , G01J3/0256 , G01J3/453 , G02B6/29344 , G02B6/4287
Abstract: Multimode interference can be used to achieve ultra-high resolving powers (e.g., Q>105) with linewidths down to 10 pm at 1500 nm and a broad spectroscopy range (e.g., 400-2400 nm) within a monolithic, millimeter-scale device. For instance, multimode interference (MMI) in a tapered waveguide enables fine resolution and broadband spectroscopy in a compact, monolithic device. The operating range is limited by the transparency of the waveguide material and the sensitivity of the camera; thus, the technique can be easily extended into the ultraviolet and mid- and deep-infrared spectrum. Experiments show that a tapered fiber multimode interference spectrometer can operate across a range from 500 nm to 1600 nm (B=1.0576) without moving parts. The technique is suitable for on-chip tapered multimode waveguides, which could be fabricated in high volume by printing or optical lithography, for applications from biochemical sensing to the life and physical sciences.
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