Observation of -9 dB quadrature squeezing with improvement of phase stability in homodyne measurement

Takeno, Yuishi; Yukawa, Mitsuyoshi; Yonezawa, Hidehiro; Furusawa, Akira

doi:10.1364/oe.15.004321

Cited by 257 publications

(263 citation statements)

References 11 publications

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“…Various methods of an active phase lock can be used instead to keep the phase locked to a particular setpoint employing a feedback loop, which has to be faster than the typical phase drift. Unfortunately, the overall noise of the feedback loop used ultimately limits the minimum attainable phase uncertainty to a few degrees 7,8 . For low-level light applications, which typically employ single photon detectors with discrete output, the response of the feedback loop is superimposed with Poissonian photodetection noise 9 .…”

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confidence: 99%

Highly stable polarization independent Mach-Zehnder interferometer

Mičuda

Doláková

Straka

et al. 2014

Review of Scientific Instruments

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We experimentally demonstrate optical Mach-Zehnder interferometer utilizing displaced Sagnac configuration to enhance its phase stability. The interferometer with footprint of 27×40 cm offers individually accessible paths and shows phase deviation less than 0.4 deg during a 250 s long measurement. The phase drift, evaluated by means of Allan deviation, stays below 3 deg or 7 nm for 1.5 hours without any active stabilization. The polarization insensitive design is verified by measuring interference visibility as a function of input polarization. For both interferometer's output ports and all tested polarization states the visibility stays above 93%. The discrepancy in visibility for horizontal and vertical polarization about 3.5% is caused mainly by undesired polarization dependence of splitting ratio of the beam splitter used. The presented interferometer device is suitable for quantum-information and other sensitive applications where active stabilization is complicated and common-mode interferometer is not an option as both the interferometer arms have to be accessible individually.

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mentioning

confidence: 99%

Highly stable polarization independent Mach-Zehnder interferometer

Mičuda

Doláková

Straka

et al. 2014

Review of Scientific Instruments

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“…[9]. Important milestones were the controlled generation of squeezed states at audio-band frequencies [19][20][21], the test of compatibility of squeezedlight injection with enhancement cavities [22][23][24][25][26], and the generation of strongly squeezed states of light [27][28][29][30][31][32]. Figure 3 shows a photograph of our squeezed-light laser that was completed in 2010 at the Institute for Gravitational Physics (Albert-Einstein-Institute Hannover) and that is now part of the GEO 600 02002-p.3 Figure 3.…”

Section: Generation Of Squeezed Light For Gravitational Wave Detectionmentioning

confidence: 99%

A gravitational wave detector operating beyond the quantum shot-noise limit: Squeezed light in application

Schnabel

2013

EPJ Web of Conferences

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Abstract. This contribution reviews our recent progress on the generation of squeezed light [1], and also the recent squeezed-light enhancement of the gravitational wave detector GEO 600 [2]. GEO 600 is currently the only GW observatory operated by the LIGO Scientific Collaboration in its search for gravitational waves. With the help of squeezed states of light it now operates with its best ever sensitivity, which not only proves the qualification of squeezed light as a key technology for future gravitational wave astronomy but also the usefulness of quantum entanglement.

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“…The solid lines in the figure represent a theoretical model. The squeezed (sqz) and anti-squeezed (asqz) quadrature variances of the field can be described as a function of pump power P by [22] Var sqz,asqz = 1 ± ηγ 4 P/P th…”

Section: Demonstration Of Epr Entanglementmentioning

confidence: 99%

Strong Einstein-Podolsky-Rosen entanglement from a single squeezed light source

et al. 2011

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Einstein-Podolsky-Rosen (EPR) entanglement is a criterion that is more demanding than just certifying entanglement. We theoretically and experimentally analyze the low resource generation of bi-partite continuous variable entanglement, as realized by mixing a squeezed mode with a vacuum mode at a balanced beam splitter, i.e. the generation of so-called vacuum-class entanglement. We find that in order to observe EPR entanglement the total optical loss must be smaller than 33.3 %. However, arbitrary strong EPR entanglement is generally possible with this scheme. We realize continuous wave squeezed light at 1550 nm with up to 9.9 dB of non-classical noise reduction, which is the highest value at a telecom wavelength so far. Using two phase controlled balanced homodyne detectors we observe an EPR co-variance product of 0.502 ± 0.006 < 1, where 1 is the critical value. We discuss the feasibility of strong Gaussian entanglement and its application for quantum key distribution in a short-distance fiber network.

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Observation of -9 dB quadrature squeezing with improvement of phase stability in homodyne measurement

Cited by 257 publications

References 11 publications

Highly stable polarization independent Mach-Zehnder interferometer

Highly stable polarization independent Mach-Zehnder interferometer

A gravitational wave detector operating beyond the quantum shot-noise limit: Squeezed light in application

Strong Einstein-Podolsky-Rosen entanglement from a single squeezed light source

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