We reveal that quadrature squeezing can result in significantly better quantum-estimation performance with quantum heterodyne detection (of H. P. Yuen and J. H. Shapiro) as compared to quantum homodyne detection for Gaussian states, which touches an important aspect in the foundational understanding of these two schemes. Taking single-mode Gaussian states as examples, we show analytically that the competition between the errors incurred during tomogram processing in homodyne detection and the Arthurs-Kelly uncertainties arising from simultaneous incompatible quadrature measurements in heterodyne detection can often lead to the latter giving more accurate estimates. This observation is also partly a manifestation of a fundamental relationship between the respective data uncertainties for the two schemes. In this sense, quadrature squeezing can be used to overcome intrinsic quantum-measurement uncertainties in heterodyne detection.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4508669 | PMC |
| http://dx.doi.org/10.1038/srep12289 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Generation of two mode mechanical squeezing induced by nondegenerate parametric amplification.
Sci Rep
November 2024
Department of Physics, Haramaya University, 138, Dire Dawa, Ethiopia.
Squeezing light in an optomechanical system involves reducing quantum noise in one of the light's quadratures through the interaction between optical and mechanical modes. However, achieving successful implementation requires careful control of experimental parameters, which can be challenging. Here, we investigate a two-mode squeezed light transfer from optical to mechanical modes induced by a non-degenerate optical parametric amplifier (OPA).
View Article and Find Full Text PDFDemonstration of microwave single-shot quantum key distribution.
Nat Commun
August 2024
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany.
Security of modern classical data encryption often relies on computationally hard problems, which can be trivialized with the advent of quantum computers. A potential remedy for this is quantum communication which takes advantage of the laws of quantum physics to provide secure exchange of information. Here, quantum key distribution (QKD) represents a powerful tool, allowing for unconditionally secure quantum communication between remote parties.
View Article and Find Full Text PDFQuantum Enhanced Balanced Heterodyne Readout for Differential Interferometry.
Phys Rev Lett
August 2024
OzGrav, Centre for Gravitational Astrophysics, Research School of Physics and Research School of Astronomy and Astrophysics, Australian National University, Australian Capital Territory, Australia.
Conventional heterodyne readout schemes are now under reconsideration due to the realization of techniques to evade its inherent 3 dB signal-to-noise penalty. The application of high-frequency, quadrature-entangled, two-mode squeezed states can further improve the readout sensitivity of audio-band signals. In this Letter, we experimentally demonstrate quantum-enhanced heterodyne readout of two spatially distinct interferometers with direct optical signal combination, circumventing the 3 dB heterodyne signal-to-noise penalty.
View Article and Find Full Text PDFClassical-Nonclassical Polarity of Gaussian States.
Phys Rev Lett
June 2024
Institute for Quantum Science and Engineering (IQSE) and Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA.
Gaussian states with nonclassical properties such as squeezing and entanglement serve as crucial resources for quantum information processing. Accurately quantifying these properties within multimode Gaussian states has posed some challenges. To address this, we introduce a unified quantification: the "classical-nonclassical polarity," represented by P.
View Article and Find Full Text PDFEntanglement Growth via Splitting of a Few Thermal Quanta.
Phys Rev Lett
May 2024
Department of Optics, Palacký University, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic.
Article Synopsis
- - Quanta splitting is a key method for creating Gaussian entanglement, often seen in Einstein-Podolsky-Rosen states and requiring strong pumping from a low-noise external source.
- - Recent experiments with trapped ions and superconducting circuits have explored the coupling of thermal quanta, leading to significant nonclassicality and measurable entanglement levels exceeding 3 dB of distillable quadrature squeezing.
- - This new entanglement, which is not confined to Gaussian approximations, increases with the number of thermal quanta split, offering insights into non-linear bosonic systems and their potential for generating substantial entanglement.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!