Quantum-mechanics free subsystem with mechanical oscillators
- URL: http://arxiv.org/abs/2009.12902v2
- Date: Wed, 12 May 2021 13:54:56 GMT
- Title: Quantum-mechanics free subsystem with mechanical oscillators
- Authors: Laure Mercier de L\'epinay, Caspar F. Ockeloen-Korppi, Matthew J.
Woolley and Mika A. Sillanp\"a\"a
- Abstract summary: We show how it is possible to measure an oscillator without quantum backaction of the measurement.
We show the measurements of two collective quadratures while evading the quantum backaction by $8$ decibels on both of them.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum mechanics sets a limit for the precision of continuous measurement of
the position of an oscillator. Here we show how it is possible to measure an
oscillator without quantum backaction of the measurement by constructing one
effective oscillator from two physical oscillators. We realize such a
quantum-mechanics free subsystem using two micromechanical oscillators, and
show the measurements of two collective quadratures while evading the quantum
backaction by $8$ decibels on both of them, obtaining a total noise within a
factor two of the full quantum limit. This facilitates detection of weak forces
and the generation and measurement of nonclassical motional states of the
oscillators. Moreover, we directly verify the quantum entanglement of the two
oscillators by measuring the Duan quantity $1.4$ decibels below the
separability bound.
Related papers
- Enhanced optomechanical interaction in the unbalanced interferometer [40.96261204117952]
Quantum optomechanical systems enable the study of fundamental questions on quantum nature of massive objects.
Here we propose a modification of the Michelson-Sagnac interferometer, which allows to boost the optomechanical coupling strength.
arXiv Detail & Related papers (2023-05-11T14:24:34Z) - Evolution of many-body systems under ancilla quantum measurements [58.720142291102135]
We study the concept of implementing quantum measurements by coupling a many-body lattice system to an ancillary degree of freedom.
We find evidence of a disentangling-entangling measurement-induced transition as was previously observed in more abstract models.
arXiv Detail & Related papers (2023-03-13T13:06:40Z) - Schr\"odinger cat states of a 16-microgram mechanical oscillator [54.35850218188371]
The superposition principle is one of the most fundamental principles of quantum mechanics.
Here we demonstrate the preparation of a mechanical resonator with an effective mass of 16.2 micrograms in Schr"odinger cat states of motion.
We show control over the size and phase of the superposition and investigate the decoherence dynamics of these states.
arXiv Detail & Related papers (2022-11-01T13:29:44Z) - Quantum vibrational mode in a cavity confining a massless spinor field [91.3755431537592]
We analyse the reaction of a massless (1+1)-dimensional spinor field to the harmonic motion of one cavity wall.
We demonstrate that the system is able to convert bosons into fermion pairs at the lowest perturbative order.
arXiv Detail & Related papers (2022-09-12T08:21:12Z) - Nonreciprocal enhancement of remote entanglement between nonidentical
mechanical oscillators [3.615369748154691]
Entanglement between distant massive mechanical oscillators is of particular interest in quantum-enabled devices.
We show how to achieve nonreciprocal remote entanglement between two spatially separated mechanical oscillators in a cascaded optomechanical configuration.
Our work provides an enticing new opportunity to explore the nonclassical correlations between distant massive objects.
arXiv Detail & Related papers (2022-08-22T01:33:21Z) - Strong angular momentum optomechanical coupling for macroscopic quantum
control [5.693393434312775]
We propose a quantum optomechanical system involving exchange interaction between spin angular momentum of light and a torsional oscillator.
We demonstrate that this system allows coherent control of the torsional quantum state of a torsional oscillator on the single photon level.
Our work provides a platform to verify the validity of quantum mechanics in macroscopic systems on the micrometer and even centimeter scale.
arXiv Detail & Related papers (2021-09-29T03:18:48Z) - Efficiently Fuelling a Quantum Engine with Incompatible Measurements [0.0]
We present two protocols for work extraction, respectively based on single-shot and time-continuous quantum measurements.
We relate the extractable work to the noise added by quadrature measurements, and present exact results for the work distribution at arbitrary finite time.
arXiv Detail & Related papers (2021-07-28T09:32:35Z) - Superposition of two-mode squeezed states for quantum information
processing and quantum sensing [55.41644538483948]
We investigate superpositions of two-mode squeezed states (TMSSs)
TMSSs have potential applications to quantum information processing and quantum sensing.
arXiv Detail & Related papers (2021-02-01T18:09:01Z) - Information Scrambling in Computationally Complex Quantum Circuits [56.22772134614514]
We experimentally investigate the dynamics of quantum scrambling on a 53-qubit quantum processor.
We show that while operator spreading is captured by an efficient classical model, operator entanglement requires exponentially scaled computational resources to simulate.
arXiv Detail & Related papers (2021-01-21T22:18:49Z) - Proposal for a nanomechanical qubit [0.0]
A mechanical quantum bit could provide an important new platform for quantum computation and sensing.
We show that by coupling one of the flexural modes of a suspended carbon nanotube to the charge states of a double quantum dot defined in the nanotube, it is possible to induce sufficient anharmonicity.
Remarkably, the dephasing due to the quantum dot is expected to be reduced by several orders of magnitude in the coupled system.
arXiv Detail & Related papers (2020-08-24T15:54:23Z) - Waveguide quantum optomechanics: parity-time phase transitions in
ultrastrong coupling regime [125.99533416395765]
We show that the simplest set-up of two qubits, harmonically trapped over an optical waveguide, enables the ultrastrong coupling regime of the quantum optomechanical interaction.
The combination of the inherent open nature of the system and the strong optomechanical coupling leads to emerging parity-time (PT) symmetry.
The $mathcalPT$ phase transition drives long-living subradiant states, observable in the state-of-the-art waveguide QED setups.
arXiv Detail & Related papers (2020-07-04T11:02:20Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.