Communication and Measurement with Squeezed States

Yuen, Horace P.

doi:10.1007/978-3-662-09645-1_7

Cited by 10 publications

(16 citation statements)

References 61 publications

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“…Squeezed states are interesting because they can manifest lower intrinsic noise (fluctuations around mean of a canonical variable) than coherent light [59], a feature which classical light with Poisson distribution cannot achieve. See Fig.…”

Section: Squeezed Statesmentioning

confidence: 99%

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Biophotons, coherence and photocount statistics: A critical review

Cifra

Brouder

Nerudová

et al. 2015

Journal of Luminescence

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Biological samples continuously emit ultra-weak photon emission (UPE, or "biophotons") which stems from electronic excited states generated chemically during oxidative metabolism and stress. Thus, UPE can potentially serve as a method for noninvasive diagnostics of oxidative processes or, if discovered, also of other processes capable of electron excitation. While the fundamental generating mechanisms of UPE are fairly elucidated together with their approximate ranges of intensities and spectra, statistical properties of UPE is still a highly challenging topic. Here we review claims about nontrivial statistical properties of UPE, such as coherence and squeezed states of light. After introduction to the necessary theory, we categorize the experimental works of all authors to those with solid, conventional interpretation and those with unconventional and even speculative interpretation. The conclusion of our review is twofold; while the phenomenon of UPE from biological systems can be considered experimentally well established, no reliable evidence for the coherence or nonclassicality of UPE was actually achieved up to now. Furthermore, we propose perspective avenues in the research of statistical properties of biological UPE.

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Section: Squeezed Statesmentioning

confidence: 99%

“…3 for manifestation of squeezing in the photocount distributions. The lower the intrinsic noise (related to uncertainty of a canonical variable), the higher the capability of such states to transmit information [60], but there are natural limits [59]. However, squeezed states are fragile.…”

Section: Squeezed Statesmentioning

confidence: 99%

Biophotons, coherence and photocount statistics: A critical review

Cifra

Brouder

Nerudová

et al. 2015

Journal of Luminescence

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“…Although the notion of SSM has been discussed in Ref. [9], a unitary transformation between the system and the probe that characterizes SSM has not been discussed. Unitary transformationÛ of SSM is given by Eq.…”

Section: Swapping State Measurementmentioning

confidence: 99%

“…In the present paper we discuss a swapping state measurement (SSM) in which quantum states are exchanged between the measured system and the measuring apparatus before the projection postulate is applied to the apparatus [9]. While VNM, CSM, and SSM are all noiseless, SSM is unique in that it is noiseless for an arbitrary observable.…”

Section: Introductionmentioning

confidence: 99%

Circuit analysis of quantum measurement

Kurotani

Ueda

2007

Phys. Rev. A

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We develop a circuit theory that enables us to analyze quantum measurements on a two-level system and on a continuous-variable system on an equal footing. As a measurement scheme applicable to both systems, we discuss a swapping state measurement which exchanges quantum states between the system and the measuring apparatus before the apparatus meter is read out. This swapping state measurement has an advantage in gravitational-wave detection over contractive state measurement in that the postmeasurement state of the system can be set to a prescribed one, regardless of the outcome of the measurement.

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“…For instance, it can be applied in quantum communications and measurements as well as novel spectroscopy with two-level atoms in squeezed fields. In terms of quantum communications, squeezed states are beneficial especially for reducing the noise in quantum channels [1]. The basic ideas underlying squeezed states of light involve quantum noise or fluctuations in the quadrature components of the field and the uncertainty principle [2].…”

Section: Introductionmentioning

confidence: 99%