Quantum mechanics dictates that a measurement without perturbation is not
possible. A textbook example is the observation of the position of an object,
which imposes a random back action perturbation on the momentum. This
randomness translates with time into position uncertainty, thus leading to the
well known uncertainty on the measurement of motion. Here we demonstrate that
the back action on an oscillator measured in a reference frame of another
oscillator with an effective negative mass can be evaded in both position and
momentum variables simultaneously. The mechanical oscillator is a
millimeter-sized membrane and the reference negative mass oscillator is the
collective spin of an atomic ensemble precessing in a magnetic field. Laser
light transmitted through the hybrid system of these two disparate oscillators
serves as the meter. We first observe the quantum measurement back action on
each oscillator. We then demonstrate that back action at the single noise
photon level is efficiently suppressed or enhanced depending on the sign of the
effective mass of the reference spin oscillator. The two oscillators are
separated by one meter but can be placed at a much larger distance as they are
interfaced by laser light. The reference spin oscillator is insensitive to
gravity and acceleration which can be efficiently detected by the mechanical
oscillator in the absence of the measurement back action. The novel hybrid
quantum system presented here paves the road to generation of entanglement and
distant quantum communication between mechanical and spin systems and to back
action free sensing of acceleration and force.
Beschreibung
[1608.03613] Back action evading quantum measurement of motion in a negative mass reference frame
%0 Generic
%1 moller2016action
%A Møller, Christoffer B.
%A Thomas, Rodrigo A.
%A Vasilakis, Georgios
%A Zeuthen, Emil
%A Tsaturyan, Yeghishe
%A Jensen, Kasper
%A Schliesser, Albert
%A Hammerer, Klemens
%A Polzik, Eugene S.
%D 2016
%K
%T Back action evading quantum measurement of motion in a negative mass
reference frame
%U http://arxiv.org/abs/1608.03613
%X Quantum mechanics dictates that a measurement without perturbation is not
possible. A textbook example is the observation of the position of an object,
which imposes a random back action perturbation on the momentum. This
randomness translates with time into position uncertainty, thus leading to the
well known uncertainty on the measurement of motion. Here we demonstrate that
the back action on an oscillator measured in a reference frame of another
oscillator with an effective negative mass can be evaded in both position and
momentum variables simultaneously. The mechanical oscillator is a
millimeter-sized membrane and the reference negative mass oscillator is the
collective spin of an atomic ensemble precessing in a magnetic field. Laser
light transmitted through the hybrid system of these two disparate oscillators
serves as the meter. We first observe the quantum measurement back action on
each oscillator. We then demonstrate that back action at the single noise
photon level is efficiently suppressed or enhanced depending on the sign of the
effective mass of the reference spin oscillator. The two oscillators are
separated by one meter but can be placed at a much larger distance as they are
interfaced by laser light. The reference spin oscillator is insensitive to
gravity and acceleration which can be efficiently detected by the mechanical
oscillator in the absence of the measurement back action. The novel hybrid
quantum system presented here paves the road to generation of entanglement and
distant quantum communication between mechanical and spin systems and to back
action free sensing of acceleration and force.
@misc{moller2016action,
abstract = {Quantum mechanics dictates that a measurement without perturbation is not
possible. A textbook example is the observation of the position of an object,
which imposes a random back action perturbation on the momentum. This
randomness translates with time into position uncertainty, thus leading to the
well known uncertainty on the measurement of motion. Here we demonstrate that
the back action on an oscillator measured in a reference frame of another
oscillator with an effective negative mass can be evaded in both position and
momentum variables simultaneously. The mechanical oscillator is a
millimeter-sized membrane and the reference negative mass oscillator is the
collective spin of an atomic ensemble precessing in a magnetic field. Laser
light transmitted through the hybrid system of these two disparate oscillators
serves as the meter. We first observe the quantum measurement back action on
each oscillator. We then demonstrate that back action at the single noise
photon level is efficiently suppressed or enhanced depending on the sign of the
effective mass of the reference spin oscillator. The two oscillators are
separated by one meter but can be placed at a much larger distance as they are
interfaced by laser light. The reference spin oscillator is insensitive to
gravity and acceleration which can be efficiently detected by the mechanical
oscillator in the absence of the measurement back action. The novel hybrid
quantum system presented here paves the road to generation of entanglement and
distant quantum communication between mechanical and spin systems and to back
action free sensing of acceleration and force.},
added-at = {2017-02-01T14:44:00.000+0100},
author = {Møller, Christoffer B. and Thomas, Rodrigo A. and Vasilakis, Georgios and Zeuthen, Emil and Tsaturyan, Yeghishe and Jensen, Kasper and Schliesser, Albert and Hammerer, Klemens and Polzik, Eugene S.},
biburl = {https://www.bibsonomy.org/bibtex/2dff49d091c22de1b7ba0e506528d68a9/klhamm},
description = {[1608.03613] Back action evading quantum measurement of motion in a negative mass reference frame},
interhash = {c83539af23380407d11617f5c48a6baf},
intrahash = {dff49d091c22de1b7ba0e506528d68a9},
keywords = {},
note = {cite arxiv:1608.03613},
timestamp = {2017-02-01T14:44:00.000+0100},
title = {Back action evading quantum measurement of motion in a negative mass
reference frame},
url = {http://arxiv.org/abs/1608.03613},
year = 2016
}