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Creators/Authors contains: "Venkateswara, K."

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review D)
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  2. ; ; ; ; ; ; ; (, Review of Scientific Instruments)
    We describe a liquid-cryogen free cryostat with ultra-low vibration levels, which allows for continuous operation of a torsion balance at cryogenic temperatures. The apparatus uses a commercially available two-stage pulse-tube cooler and passive vibration isolation. The torsion balance exhibits torque noise levels lower than room temperature thermal noise by a factor of about four in the frequency range of 3–10 mHz, limited by residual seismic motion and by radiative heating of the pendulum body. In addition to lowering thermal noise below room-temperature limits, the low-temperature environment enables novel torsion balance experiments. Currently, the maximum duration of a continuous measurement run is limited by accumulation of cryogenic surface contamination on the optical elements inside the cryostat. 
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  3. ; ; ; ; ; ; ; ; (, Review of Scientific Instruments)
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  4. ; ; ; ; ; ; ; ; (, Review of scientific instruments)
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    Accepted Manuscript Full Text Available
  5. ; ; ; ; ; ; ; (, Physical Review D)
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  6. ; ; ; ; ; ; ; ; (, Physical Review D)
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  7. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review Letters)
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  8. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review D)
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  9. ; ; ; ; ; ; ; ; ; ; et al (, Science)
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    The motion of a mechanical object, even a human-sized object, should be governed by the rules of quantum mechanics. Coaxing them into a quantum state is, however, difficult because the thermal environment masks any quantum signature of the object’s motion. The thermal environment also masks the effects of proposed modifications of quantum mechanics at large mass scales. We prepared the center-of-mass motion of a 10-kilogram mechanical oscillator in a state with an average phonon occupation of 10.8. The reduction in temperature, from room temperature to 77 nanokelvin, is commensurate with an 11 orders-of-magnitude suppression of quantum back-action by feedback and a 13 orders-of-magnitude increase in the mass of an object prepared close to its motional ground state. Our approach will enable the possibility of probing gravity on massive quantum systems. 
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  10. ; ; ; ; ; ; ; ; ; ; et al (, Classical and Quantum Gravity)
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