Projects per year
Abstract
The standard quantum limit constrains the precision of an oscillator position measurement. It arises from a balance between the imprecision and the quantum backaction of the measurement. However, a measurement of only a single quadrature of the oscillator can evade the backaction and be made with arbitrary precision. Here we demonstrate quantum backaction evading measurements of a collective quadrature of two mechanical oscillators, both coupled to a common microwave cavity. The work allows for quantum state tomography of two mechanical oscillators, and provides a foundation for macroscopic mechanical entanglement and force sensing beyond conventional quantum limits.
Original language | English |
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Article number | 140401 |
Pages (from-to) | 1-6 |
Number of pages | 6 |
Journal | Physical Review Letters |
Volume | 117 |
Issue number | 14 |
DOIs | |
Publication status | Published - 26 Sep 2016 |
MoE publication type | A1 Journal article-refereed |
Keywords
- NANOMECHANICAL MOTION
- CAVITY OPTOMECHANICS
- NOISE
- OSCILLATOR
- SCHEME
- STATE
- LIMIT
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Dive into the research topics of 'Quantum Backaction Evading Measurement of Collective Mechanical Modes'. Together they form a unique fingerprint.Projects
- 2 Finished
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Centre of Excellence in Low Temperature Quantum Phenomena and Devices
01/01/2015 → 31/12/2017
Project: Academy of Finland: Other research funding
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CAVITYQPD: Cavity quantum phonon dynamics
Välimaa, A., Ockeloen-Korppi, C., Santos, J. T., Damskägg, E., Sillanpää, M., Rissanen, I., Mahato, S., Mercier de Lepinay, L., Crump, W., Mishra, H., Kervinen, M., Brandt, M., Sulkko, J., Pirkkalainen, J., Tong, F., Wang, C. & Zhou, J.
20/11/2014 → 31/12/2020
Project: EU: ERC grants