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Moan ER, Horne RA, Arpornthip T, Luo Z, Fallon AJ, Berl SJ, Sackett CA. Quantum Rotation Sensing with Dual Sagnac Interferometers in an Atom-Optical Waveguide. Phys Rev Lett 2020; 124:120403. [PMID: 32281864 DOI: 10.1103/physrevlett.124.120403] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 01/07/2020] [Accepted: 03/09/2020] [Indexed: 06/11/2023]
Abstract
We describe a Sagnac interferometer suitable for rotation sensing, implemented using an atomic Bose-Einstein condensate confined in a harmonic magnetic trap. The atom wave packets are split and recombined by standing-wave Bragg lasers, and the trapping potential steers the packets along circular trajectories with a radius of 0.2 mm. Two conjugate interferometers are implemented simultaneously to provide common-mode rejection of noise and to isolate the rotation signal. With interference visibilities of about 50%, we achieve a rotation sensitivity comparable to Earth's rate in about 10 min of operation. Gyroscope operation was demonstrated by rotating the optical table on which the experiment was performed.
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Affiliation(s)
- E R Moan
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - R A Horne
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - T Arpornthip
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - Z Luo
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - A J Fallon
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - S J Berl
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
| | - C A Sackett
- Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
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Horne RA, Sackett CA. A cylindrically symmetric magnetic trap for compact Bose-Einstein condensate atom interferometer gyroscopes. Rev Sci Instrum 2017; 88:013102. [PMID: 28147663 DOI: 10.1063/1.4973123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present a variant of the time-orbiting potential trap suitable for Bose-Einstein condensate atom interferometers, which provides weak, cylindrically symmetric confinement as well as support for the atoms against gravity. This trapping configuration is well-suited for the implementation of a compact atom interferometer based gyroscope. The trap is made up of six coils, which were produced using photolithographic techniques and take up a modest volume of approximately 1 cubic inch inside a vacuum chamber. The trapping frequencies and thermal characteristics of the trap are presented, showing cylindrical symmetry and scalability of the trapping frequencies from 1 Hz to 8 Hz in the symmetry plane.
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Affiliation(s)
- R A Horne
- NASA Langley Research Center, Revolutionary Aviation Technologies Branch, Mail Stop 207, Hampton, Virginia 23681-2199, USA
| | - C A Sackett
- Department of Physics, University of Virginia, 382 McCormick Road, Charlottesville, Virginia 22904-4714, USA
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Oh E, Horne RA, Sackett CA. Fast phase stabilization of a low frequency beat note for atom interferometry. Rev Sci Instrum 2016; 87:063105. [PMID: 27370424 DOI: 10.1063/1.4953338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Atom interferometry experiments rely on the ability to obtain a stable signal that corresponds to an atomic phase. For interferometers that use laser beams to manipulate the atoms, noise in the lasers can lead to errors in the atomic measurement. In particular, it is often necessary to actively stabilize the optical phase between two frequency components of the beams. Typically this is achieved using a time-domain measurement of a beat note between the two frequencies. This becomes challenging when the frequency difference is small and the phase measurement must be made quickly. The method presented here instead uses a spatial interference detection to rapidly measure the optical phase for arbitrary frequency differences. A feedback system operating at a bandwidth of about 10 MHz could then correct the phase in about 3 μs. This time is short enough that the phase correction could be applied at the start of a laser pulse without appreciably degrading the fidelity of the atom interferometer operation. The phase stabilization system was demonstrated in a simple atom interferometer measurement of the (87)Rb recoil frequency.
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Affiliation(s)
- E Oh
- Department of Physics, University of Virginia, 382 McCormick Road, Charlottesville, Virginia 22904-4714, USA
| | - R A Horne
- Department of Physics, University of Virginia, 382 McCormick Road, Charlottesville, Virginia 22904-4714, USA
| | - C A Sackett
- Department of Physics, University of Virginia, 382 McCormick Road, Charlottesville, Virginia 22904-4714, USA
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Horne RA, Courant RA. The temperature dependence of the activation energy of the electrical conductivity of sea water in the temperature range 0°C to 10°C. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jz069i006p01152] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Horne RA, Courant RA, Myers BR, George JHB. Ion-Exchange Equilibria at High Hydrostatic Pressures. The Hydrogen Ion—Potassium Ion and Hydrogen Ion—Strontium Ion Systems on Sulfonic Acid-Type Cation-Exchange Resins. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100791a032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Horne RA, Myers BR, Frysinger GR. The Effect of Pressure on the Dissociation of Iron(III) Monochloride Complex Ion in Aqueous Solution. Inorg Chem 2002. [DOI: 10.1021/ic50013a032] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Horne RA, Young RP. The electrical conductivity of aqueous tetraalkylammonium halide solutions under hydrostatic pressure. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100851a065] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Horne RA, Courant RA, Johnson DS, Margosian FF. The Activation Energy of Viscous Flow of Pure Water and Sea Water in the Temperature Region of Maximum Density. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100895a057] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Horne RA, Holm RH, Meyers MD. The Adsorption of Zinc(II) on Anion-exchange Resins. II. Stoichiometry, Thermodynamics, Loading Studies, Dowex-2 Adsorption and Factors Influencing the Rate of the Adsorption Process. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j150558a023] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Horne RA. THE KINETICS OF THE OXALATE CATALYSIS OF THE IRON(II)—IRON(III) ELECTRON-EXCHANGE REACTION IN AQUEOUS SOLUTION1. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100839a040] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Seated BP measurements were taken in 48 men with a history of essential hypertension: in a chair with back support v on an examining table with no back support, and with bell v diaphragm stethoscope head in each condition. There were no significant differences between bell and diaphragm in SBP or DBP determinations. SBP was not significantly different between table and chair, but table DBP was 6.5 mm Hg higher (P less than .0001) than chair DBP. We conclude that back support, but not bell v diaphragm stethoscope head, affects seated BP determinations.
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Affiliation(s)
- W C Cushman
- Research Service, Veterans Affairs Medical Center, Jackson, Mississippi
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Marsh GN, Horne RA, Channing DM. A study of telephone advice in managing out-of-hours calls. J R Coll Gen Pract 1987; 37:301-4. [PMID: 3449631 PMCID: PMC1710944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Two doctors in a five-partner urban practice recorded details of their out-of-hours telephone calls for a year. No caller was refused a visit, but 474 of the 809 incoming calls (59%) were managed by telephone advice, an unexpectedly high proportion. Although these callers were instructed to telephone again if still worried, only 40 did so during the same duty period, and only 55% of a smaller sample of patients receiving telephone advice only consulted again within a week. No evident detriment to patients' health was observed. Thirty nine (5%) of the 809 incoming calls were managed by an out-of-hours surgery attendance and 296(37%) by a home visit. The urgency of the visits made was categorized retrospectively as high (34% of visits), medium (39%) and low (27%). It is hoped that this descriptive account will foster discussion of the value and implications of telephone advice in managing out-of-hours calls.
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Affiliation(s)
- R. A. Horne
- Free Speech Foundation, Inc., 9 Wellington Street, Boston, Massachusetts 02118
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Horne RA. Federal Funding of Medical Schools. Science 1976; 194:1377. [PMID: 17819259 DOI: 10.1126/science.194.4272.1377-c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Horne RA. Scientists Involved in Environmental Litigation. Science 1976. [DOI: 10.1126/science.194.4272.1377-d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- R. A. Horne
- 9 Wellington Street, Boston, Massachusetts 02118
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Horne RA. Scientists Involved in Environmental Litigation. Science 1976. [DOI: 10.1126/science.194.4272.1377.d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- R. A. Horne
- 9 Wellington Street, Boston, Massachusetts 02118
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Affiliation(s)
- R. A. Horne
- JBF Scientific Corporation, Burlington, Massachusetts 01803
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Affiliation(s)
- R. A. Horne
- JBF Scientific Corporation, Burlington, Massachusetts 01803
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Horne RA. An hypothesis concerning the mechanism of the sodium-potassium pump. Space Life Sci 1972; 3:235-8. [PMID: 5038190 DOI: 10.1007/bf00928168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Horne RA. On the unlikelihood of non-aqueous biosystems. Space Life Sci 1971; 3:34-41. [PMID: 5116876 DOI: 10.1007/bf00924212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Horne RA, Almeida JP, Day AF, Yu NT. Macromolecule hydration and the effect of solutes on the cloud point of aqueous solutions of polyvinyl methyl ether: a possible model for protein denaturation and temperature control in homeothermic animals. J Colloid Interface Sci 1971; 35:77-84. [PMID: 5542025 DOI: 10.1016/0021-9797(71)90187-1] [Citation(s) in RCA: 153] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Affiliation(s)
- R. A. Horne
- Department of Chemistry, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543
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Horne RA, Eden HF, Young RP. The energetics of ion transport in the presence of polymeric compounds which alter the rheological properties of water. J Appl Polym Sci 1968. [DOI: 10.1002/app.1968.070120621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Horne RA, Johnson DS. Arrhenius Activation Energy of Electrical Conductance of Aqueous Lithium and Cesium Chloride Solutions in the −2°‐+12°C Range. J Chem Phys 1966. [DOI: 10.1063/1.1727310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- R. A. Horne
- Arthur D. Little, Inc., Cambridge, Massachusetts
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Kazi MA, Khan IH, Khan MY, Kale MN, Maccoll A, Horne RA, Courant RA, Frysinger GR, Hotz MCB, Shaw R, Hallas G, Taylor DC, Charalambous J, Frazer MJ, Gerrard W, Tidd BK, Katritzky AR, Waring AJ, Ellis GP, King J, Lee TB, Crofts PC, Gosling K, Alder RW, Whiting MC, Abel EW, Willey GR, Jansen ABA, Stokes PJ, Mann RS, Cole ARH, Osborne GA. Notes. ACTA ACUST UNITED AC 1964. [DOI: 10.1039/jr9640001511] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Horne RA, Myers BR, Frysinger GR. Effect of Pressure on the Activation Energy of Electrical Conduction in Aqueous Solution. J Chem Phys 1963. [DOI: 10.1063/1.1734079] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Horne RA. Role of Water in the Stability of Oxyhemoglobin. Science 1959. [DOI: 10.1126/science.130.3368.164.a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- R. A. Horne
- 406 Marlborough Street, Boston, Massachusetts
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