Results 31 to 40 of about 1,674 (111)

Noiseless amplification of weak coherent fields without external energy

, 2013
According to the fundamental laws of quantum optics, noise is necessarily added to the system when one tries to clone or amplify a quantum state. However, it has recently been shown that the quantum noise related to the operation of a linear phase ...
Häyrynen, Teppo, Oksanen, Jani, Partanen, Mikko, Tulkki, Jukka   +3 more
core   +1 more source

QND and higher order effects for a nonlinear meter in an interferometric gravitational wave antenna [PDF]

, 1997
A new optical topology and signal readout strategy for a laser interferometer gravitational wave detector were proposed recently by Braginsky and Khalili .
A. Abramovici, C. Baradaschia, M. T. Jaekel, S. P. Vyatchanin, V. B. Braginsky, V. B. Braginsky, Yu. Levin   +6 more
core   +2 more sources

State‐Dependent Implication and Equivalence in Quantum Logic

Advances in Mathematical Physics, Volume 2012, Issue 1, 2012., 2012
Ideal occurrence of an event (projector) E leads to the known change of a state (density operator) ρ into EρE/[tr(Eρ)] (the Lüders state). It is shown that two events E and F give the same Lüders state if and only if the equivalence relation Eρ = Fρ is valid. This relation determines equivalence classes.
Fedor Herbut, Emilio Elizalde
wiley   +1 more source

Feedback Control in Quantum Optics: An Overview of Experimental Breakthroughs and Areas of Application

International Scholarly Research Notices, Volume 2012, Issue 1, 2012., 2012
We present a broad summary of research involving the application of quantum feedback control techniques to optical setups, from the early enhancement of optical amplitude squeezing to the recent stabilisation of photon number states in a microwave cavity, dwelling mostly on the latest experimental advances.
Alessio Serafini, D. Kouznetsov, A. A. Sukhorukov   +2 more
wiley   +1 more source

Quantum nondemolition detection of a propagating microwave photon [PDF]

, 2013
The ability to nondestructively detect the presence of a single, traveling photon has been a long-standing goal in optics, with applications in quantum information and measurement.
Baragiola, Ben Q., Combes, Joshua, Johansson, G., Kockum, Anton F., Sathyamoorthy, Sankar R., Stace, Thomas M., Tornberg, L., Wilson, C. M.   +7 more
core   +2 more sources

Strong broadband intensity noise squeezing from infrared to terahertz frequencies in lasers with nonlinear dissipation

Nanophotonics, Volume 14, Issue 20, Page 3243-3254, 01 October 2025.
Abstract The generation and application of squeezed light have long been central goals of quantum optics. Intensity noise squeezing of bright (coherent) states (“bright squeezing”), in contrast to squeezed vacuum, is relatively underdeveloped. The current state of the art has generally been restricted to narrow operating wavelength ranges and does not ...
Sahil Pontula, Jamison Sloan, Nicholas Rivera, Marin Soljačić   +3 more
wiley   +1 more source

Efficient scheme for three-photon Greenberger-Horne-Zeilinger state generation

, 2012
We propose an efficient scheme for the generation of three-photon Greenberger-Horne-Zeilinger (GHZ) state with linear optics and postselection. Several devices are designed and a two-mode quantum nondemolition (QND) detection is introduced to obtain the ...
Barrett, Bennett, Bennett, Bennett, Bennett, Bennett, Boschi, Bouwmeester, Briegel, Cleve, Deng, Deng, Deng, Deutsch, Dong Ding, Dür, Einstein, Ekert, Feng-Li Yan, Gao, Gao, Greenberger, He, Horodecki, Howell, Imoto, Kok, Kok, Kwiat, Li, Lin, Lin, Long, Milburn, Murao, Nemoto, Nogues, Schmidt, Sheng, Sheng, Sheng, Sheng, Sheng, Shimizu, Simon, Wang, Wittmann, Yan, Yan, Yan   +49 more
core   +1 more source

Improved Placement Precision of Donor Spin Qubits in Silicon using Molecule Ion Implantation

Advanced Quantum Technologies, Volume 7, Issue 3, March 2024.
Donor spins in silicon‐28 are among the best performing qubits in the solid state. P donor placement precision is improved upon, advantageous for qubit readout and coupling, by implanting PF2$\rm{PF}_2$ molecule ions that carry bystander atoms to boost detection confidence.
Danielle Holmes, Benjamin Wilhelm, Alexander M. Jakob, Xi Yu, Fay E. Hudson, Kohei M. Itoh, Andrew S. Dzurak, David N. Jamieson, Andrea Morello   +8 more
wiley   +1 more source

A Quantum Perspective on Oscillation Frequencies in Axion Dark Matter Experiments

Annalen der Physik, Volume 536, Issue 1, January 2024.
The time evolution of signals in axion dark matter experiments, such as CASPEr, is looked at from a quantum perspective. Classically, one expects signals oscillating with a frequency equal to the axion mass. The explanation of where this oscillation frequency appears from a quantum perspective and how it relates to the axion quantum state. The suitable
Joerg Jaeckel, Valentina Montoya, Cedric Quint   +2 more
wiley   +1 more source

Generalized quantum measurements. Part I: Information properties of soft quantum measurements

, 2005
A special class of soft quantum measurements as a physical model of the fuzzy measurements widely used in physics is introduced and its information properties are studied in detail.Comment: 25 pages, 3 figures, 25 ...
A. S. Holevo, A. S. Holevo, A. Sudbery, B. A. Grishanin, B. A. Grishanin, B. A. Grishanin, B. A. Grishanin, Boris A. Grishanin, C. W. Helstrom, Ch. H. Bennett, D. Giulini, J. von Neumann, K. Kraus, M. B. Mensky, M. Schlosshauer, N. Gisin, Victor N. Zadkov   +16 more
core   +1 more source