Sub-shot-noise heterodyne polarimetry

Feng, Sheng; Pfister, Olivier

doi:10.1364/ol.29.002800

Cited by 20 publications

(15 citation statements)

References 21 publications

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“…In the context of single-parameter phase estimation, it is very well explored how quantum resources allow an improvement in the precision limit [19,20]. Such quantum metrology techniques are particularly important for measuring very light-sensitive biological samples [21] and delicate materials [22], where high power and long exposure time is not permitted.…”

Section: Introductionmentioning

confidence: 99%

Quantum-enhanced tomography of unitary processes

Zhou¹,

Cable²,

Whittaker³

et al. 2015

Optica

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This is the final published version of the article (version of record). It first appeared online via OSA at https://www.osapublishing.org/optica/abstract.cfm?uri=optica-2-6-510. Please refer to any applicable terms of use of the publisher. University of Bristol -Explore Bristol Research General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. A fundamental task in photonics is to characterize an unknown optical process, defined by properties such as birefringence, spectral response, thickness and flatness. Among many ways to achieve this, single-photon probes can be used in a method called quantum process tomography (QPT). However, the precision of QPT is limited by unavoidable shot noise when implemented using single-photon probes or laser light. In situations where measurement resources are limited, for example, where the process (sample) to be probed is very delicate such that the exposure to light has a detrimental effect on the sample, it becomes essential to overcome this precision limit.Here we devise a scheme for process tomography with a quantum-enhanced precision by drawing upon techniques from quantum metrology. We implement a proof-of-principle experiment to demonstrate this scheme-four-photon quantum states are used to probe an unknown arbitrary unitary process realized with an arbitrary polarization rotation. Our results show a substantial reduction of statistical fluctuations compared to traditional QPT methods-in the ideal case, one four-photon probe state yields the same amount of statistical information as twelve single probe photons.

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Section: Introductionmentioning

confidence: 99%

Quantum-enhanced tomography of unitary processes

Zhou¹,

Cable²,

Whittaker³

et al. 2015

Optica

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“…It is also equivalent to the generation of a bright entangled state, albeit a nonmaximally entangled one. The experimental challenge lied in the stabilization of the OPO frequencies to the level of in- B. Sub-shot-noise heterodyne polarimetry [18] S. Feng and O. Pfister, Opt. Lett.…”

Section: Summary Of the Most Important Resultsmentioning

confidence: 99%

Realization of an Ultrasensitive Heisenberg-Limited Interferometer

Pfister¹

2006

Self Cite

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Public Reporting Burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Realization of an Ultrasensitive Heisenberg-Limited Interferometer: Final Report Report Title ABSTRACTThe goal of the project "Realization of an Ultrasensitive Heisenberg-Limited Interferometer," supported by ARO grant DAAD190110721 from August 1, 2001 to July 31, 2006, was the investigation of quantum interferometry with bright nonclassical light beams emitted by an ultrastable optical parametric oscillator (OPO). Theoretical studies of the Holland-Burnett Bayesian detection scheme were conducted for realistic experimental implementation in photonic quantum optics. The main result, applicable to any boson wave (eg matter waves), is that the ultimate Heisenberg limit 1/N (N being the average number of photons detected in the measurement) can still be reached in the presence of losses for Bayesian detection, if the losses do not exceed 1/N. The main experimental results were the first demonstration of macroscopic Hong-Ou-Mandel quantum interference at a beam splitter and the demonstration of heterodyne polarimetry with a noise floor 4.8 dB below the interferometric shot noise limit (1/sqrt{N}). The latter can be applied to enhancing the sensitivity of chiral molecule detection. Realistic extensions of this study are larger amounts of squeezing (-10 dB and beyond) as well as RF broadband phase measurements, which are a direct consequence of the stability performance of our OPO and for which we also present preliminary results.

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“…This was demonstrated experimentally [7,8] and is now the approach adopted for high-frequency signals (above the standard quantum limit) in gravitational-wave detectors [9,10]. Many other approaches have been investigated [11,12], such as twin beams [13][14][15][16][17][18], "noon" states [19][20][21][22][23], or two-mode squeezed states. These different schemes were recently compared in terms of their quantum Cramér-Rao bound [24].…”

Section: Introductionmentioning

confidence: 99%

“…Gravitational-wave observatory LIGO is described by case 2, and soon case 3 [10], whereas GEO-600 is now operating with squeezing [9]. Table I is the twin Fock state input first proposed by Holland and Burnett [13], and which is im-plementable, to a good approximation, with large photon numbers by using an optical parametric oscillator above threshold [17,18,[31][32][33]. The input density operator is then of the form, in the absence of losses,…”

Section: Introductionmentioning

confidence: 99%

Generation of a highly-phase-sensitive polarization-squeezedN-photon state by collinear parametric down-conversion and coherent photon subtraction

Hofmann

2006

Phys. Rev. A

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We propose a new type of a Heisenberg-limited quantum interferometer, whose input is indistinguishably photon-subtracted twin beams. Such an interferometer can yield Heisenberg-limited performance while at the same time giving a direct fringe reading, unlike for the twin-beam input of the Holland-Burnett interferometer. We propose a feasible experimental realization, using a nondegenerate optical parametric oscillator above threshold.

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Sub-shot-noise heterodyne polarimetry

Cited by 20 publications

References 21 publications

Quantum-enhanced tomography of unitary processes

Quantum-enhanced tomography of unitary processes

Realization of an Ultrasensitive Heisenberg-Limited Interferometer

Generation of a highly-phase-sensitive polarization-squeezedN-photon state by collinear parametric down-conversion and coherent photon subtraction

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