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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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Hughes KJ, Burke JHT, Sackett CA. Suspension of atoms using optical pulses, and application to gravimetry. Phys Rev Lett 2009; 102:150403. [PMID: 19518607 DOI: 10.1103/physrevlett.102.150403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2008] [Indexed: 05/27/2023]
Abstract
Atoms from a (87)Rb condensate are suspended against gravity using repeated reflections from a pulsed optical standing wave. Up to 100 reflections are observed, yielding suspension times of over 100 ms. The local gravitational acceleration can be determined from the pulse rate required to achieve suspension. Further, a gravitationally sensitive atom interferometer was implemented using the suspended atoms. This technique could potentially provide a precision measurement of gravity without requiring the atoms to fall a large distance.
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Affiliation(s)
- K J Hughes
- Physics Department, University of Virginia, Charlottesville, Virginia 22904, USA
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Meyer V, Rowe MA, Kielpinski D, Sackett CA, Itano WM, Monroe C, Wineland DJ. Experimental demonstration of entanglement-enhanced rotation angle estimation using trapped ions. Phys Rev Lett 2001; 86:5870-5873. [PMID: 11415382 DOI: 10.1103/physrevlett.86.5870] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2001] [Indexed: 05/23/2023]
Abstract
We experimentally investigate three methods, utilizing different atomic observables and entangled states, to increase the sensitivity of rotation angle measurements beyond the "standard quantum limit" for nonentangled states. All methods use a form of quantum mechanical "squeezing." In a system of two entangled trapped (9)Be(+) ions we observe a reduction in uncertainty of rotation angle below the standard quantum limit for all three methods including all sources of noise. As an application, we demonstrate an increase in precision of frequency measurement in a Ramsey spectroscopy experiment.
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Affiliation(s)
- V Meyer
- Time and Frequency Division, National Institute of Standards and Technology, Boulder, Colorado 80305-3328, USA
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Rowe MA, Kielpinski D, Meyer V, Sackett CA, Itano WM, Monroe C, Wineland DJ. Experimental violation of a Bell's inequality with efficient detection. Nature 2001; 409:791-4. [PMID: 11236986 DOI: 10.1038/35057215] [Citation(s) in RCA: 162] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Local realism is the idea that objects have definite properties whether or not they are measured, and that measurements of these properties are not affected by events taking place sufficiently far away. Einstein, Podolsky and Rosen used these reasonable assumptions to conclude that quantum mechanics is incomplete. Starting in 1965, Bell and others constructed mathematical inequalities whereby experimental tests could distinguish between quantum mechanics and local realistic theories. Many experiments have since been done that are consistent with quantum mechanics and inconsistent with local realism. But these conclusions remain the subject of considerable interest and debate, and experiments are still being refined to overcome 'loopholes' that might allow a local realistic interpretation. Here we have measured correlations in the classical properties of massive entangled particles (9Be+ ions): these correlations violate a form of Bell's inequality. Our measured value of the appropriate Bell's 'signal' is 2.25 +/- 0.03, whereas a value of 2 is the maximum allowed by local realistic theories of nature. In contrast to previous measurements with massive particles, this violation of Bell's inequality was obtained by use of a complete set of measurements. Moreover, the high detection efficiency of our apparatus eliminates the so-called 'detection' loophole.
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Affiliation(s)
- M A Rowe
- Time and Frequency Division, National Institute of Standards and Technology, Boulder, Colorado 80305, USA
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Abstract
We demonstrate a decoherence-free quantum memory of one qubit. By encoding the qubit into the decoherence-free subspace (DFS) of a pair of trapped 9Be+ ions, we protect the qubit from environment-induced dephasing that limits the storage time of a qubit composed of a single ion. We measured the storage time under ambient conditions and under interaction with an engineered noisy environment and observed that encoding into the DFS increases the storage time by up to an order of magnitude. The encoding reversibly transfers an arbitrary qubit stored in a single ion to the DFS of two ions.
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Affiliation(s)
- D Kielpinski
- Time and Frequency Division, National Institute of Standards and Technology, Boulder, CO 80305, USA.
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Bradley CC, Sackett CA, Tollett JJ, Hulet RG. Evidence of Bose-Einstein Condensation in an Atomic Gas with Attractive Interactions. Phys Rev Lett 1995; 75:1687-1690. [PMID: 10060366 DOI: 10.1103/physrevlett.75.1687] [Citation(s) in RCA: 188] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Abraham ER, McAlexander WI, Sackett CA, Hulet RG. Spectroscopic determination of the s-wave scattering length of lithium. Phys Rev Lett 1995; 74:1315-1318. [PMID: 10058989 DOI: 10.1103/physrevlett.74.1315] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Monroe CR, Cornell EA, Sackett CA, Myatt CJ, Wieman CE. Measurement of Cs-Cs elastic scattering at T=30 microK. Phys Rev Lett 1993; 70:414-417. [PMID: 10054106 DOI: 10.1103/physrevlett.70.414] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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