Sensitivity limitations in optical speed meter topology of gravitational-wave antennas

Abstract. Rapid experimental progress has recently allowed the use of light to prepare macroscopic mechanical objects into nearly pure quantum states. This research field of quantum optomechanics opens new doors toward testing quantum mechanics, and possibly other laws of physics, in new regimes. In the first part of this paper, I will review a set of techniques of quantum measurement theory that are often used to analyze quantum optomechanical systems. Some of these techniques were originally designed to analyze how a classical driving force passes through a quantum system, and can eventually be detected with optimal signal-to-noise ratio -while others focus more on the quantum state evolution of a mechanical object under continuous monitoring. In the second part of this paper, I will review a set of experimental concepts that will demonstrate quantum mechanical behavior of macroscopic objects -quantum entanglement, quantum teleportation, and the quantum Zeno effect. Taking the interplay between gravity and quantum mechanics as an example, I will review a set of speculations on how quantum mechanics can be modified for macroscopic objects, and how these speculations -and their generalizations -might be tested by optomechanics.

show abstract

“…Some of these schemes [68,69,70,71] were "speed meters", motivated by the fact that momentum of a free mass is a QND observable [72].…”

Section: 4mentioning

confidence: 99%

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Chen¹

2013

J. Phys. B: At. Mol. Opt. Phys.

276

302

View full text Add to dashboard Cite

show abstract

“…Since the momentum is proportional to the speed, the speed meter can therefore detect gravitational wave without being limited by the radiation-pressure noise [23]. There are several speed-meter configurations, e.g., the Sagnac interferometer [36,37,26,27] and a recent proposed scheme by using different polarizations [38]. In Figure 12, we show one particular variant, which is proposed in [25], by using a sloshing cavity.…”

Section: Speed Meter With Sloshing Cavitymentioning

confidence: 99%

“…• speed-meter configurations [23,24,25,26,27], i.e., measuring a quantity that is proportional to the test mass speed at low frequencies, by inserting an additional long cavity [using strategy (iii) above];…”

Section: Introductionmentioning

confidence: 99%

Quantum limits of interferometer topologies for gravitational radiation detection

Miao

Yang

Adhikari

et al. 2014

Class. Quantum Grav.

View full text Add to dashboard Cite

Abstract. In order to expand the astrophysical reach of gravitational wave detectors, several interferometer topologies have been proposed, in the past, to evade the thermodynamic and quantum mechanical limits in future detectors. In this work, we make a systematic comparison among these topologies by considering their sensitivities and complexities. We numerically optimize their sensitivities by introducing a cost function that tries to maximize the broadband improvement over the sensitivity of current detectors. We find that frequencydependent squeezed-light injection with a hundred-meter scale filter cavity yields a good broadband sensitivity, with low complexity, and good robustness against optical loss. This study gives us a guideline for the near-term experimental research programs in enhancing the performance of future gravitational-wave detectors.

show abstract

“…by adopting speed-meter configurations [11,12,13,14,15,16], which measure the conserved quantity -momentum rather than the position. An alternative is to change the dynamics of the probe mass, e.g.…”

Section: Introductionmentioning

confidence: 99%

Increasing the sensitivity of future gravitational-wave detectors with double squeezed-input

2009

View full text Add to dashboard Cite

We consider improving the sensitivity of future interferometric gravitational-wave detectors by simultaneously injecting two squeezed vacuums (light), filtered through a resonant Fabry-Perot cavity, into the dark port of the interferometer. The same scheme with single squeezed vacuum was first proposed and analyzed by Corbitt et al.[1]. Here we show that the extra squeezed vacuum, together with an additional homodyne detection suggested previously by one of the authors [2], allows reduction of quantum noise over the entire detection band. To motivate future implementations, we take into account a realistic technical noise budget for Advanced LIGO (AdvLIGO) and numerically optimize the parameters of both the filter and the interferometer for detecting gravitational-wave signals from two important astrophysics sources, namely NeutronStar-Neutron-Star (NSNS) binaries and Bursts. Assuming the optical loss of the ∼ 30m filter cavity to be 10ppm per bounce and 10dB squeezing injection, the corresponding quantum noise with optimal parameters lowers by a factor of 10 at high frequencies and goes below the technical noise at low and intermediate frequencies.

show abstract

Sensitivity limitations in optical speed meter topology of gravitational-wave antennas

Cited by 50 publications

References 18 publications

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Quantum limits of interferometer topologies for gravitational radiation detection

Increasing the sensitivity of future gravitational-wave detectors with double squeezed-input

Contact Info

Product

Resources

About