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Showing 1 to 20 of 33 for “"Quantum Noise"”.
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Quantum noise propagation in nonlinear optical media
Good quantum mechanical descriptions of noise evolution with propagating optical waves are critical to understanding the processes which currently limit the generation of squeezed radiation in nonlinear materials. In the first part of this dissertation a general quantum optical model is developed …
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High efficiency photodetection below the quantum noise limit
Two low-noise, high quantum efficiency, high bandwidth photodetectors have constructed to form a balanced homodyne detector to detect squeezed light. The detectors have quantum efficiencies of 85% and 90%, a bandwidth of 1MHz, and a dark noise of ... at 1MHz.
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Quantum noise reduction using squeezed states in LIGO
… initial detectors by about a factor of 10. The quantum nature of light will limit the sensitivity of these Advanced LIGO interferometers at most frequencies; new approaches to reducing the quantum noise will be needed to improve the sensitivity further. This quantum noise originates from the …
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Quantum noise reduction with pulsed light in optical fibers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Taming Quantum Noise in the Open: Spin Biophysics under Optimal Control
The quantum control of spin-correlated radical pairs (SCRPs) holds promise for the targeted manipulation of magnetic field effects (MFEs), with potential applications ranging from the design of noise-resilient quantum information processors to genetically encodable quantum sensors. However, …
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Squeezing the Quantum Noise of LIGO below the Standard Quantum Limit
… sensitivity of LIGO requires an extremely low noise level. The design of LIGO as an interferometer converts the gravitational-wave signal to an optical signal, which is measured on photodiodes along with other noises. One of the noise sources is the quantum noise due to the quantum vacuum …
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Quantum noise and radiation pressure effects in high power optical interferometers
… of mechanical systems have been approaching quantum limits to their sensitivity of continuous position measurements imposed by the Heisenberg Uncertainty Principle. Most notably, gravitational wave interferometers, such as the Laser Interferometer Gravitational wave Observatory (LIGO), …
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Two-state systems with non-Markovian thermal and squeezed quantum noise inputs
The effect of quantum noise on the two-state system is studied in the context of (i) coherent quantum tunnelling in a double-well system subject to low temperature quantum noise, and (ii) the two-level atom subject to finite bandwidth squeezed noise. Our approach to these problems is based on the …
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Fluctuations in dc SQUIDs: Quantum Noise Effects, Low Frequency Noise, and Single Electron Trapping
We have studied the signal and noise properties of extremely sensitive dc SQUIDs composed of submicron area tunnel junctions. At high frequencies, the flux resolution is expected to be limited by intrinsic quantum fluctuations, making these devices prime candidates for ideal quantum-limited …
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Fluctuations in dc SQUIDs: Quantum Noise Effects, Low Frequency Noise, and Single Electron Trapping
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-20T14:25:06Z No. of bitstreams: 1 1987_wakai.pdf: 3819337 bytes, checksum: a5d33ec70db1b29e666efe334b7fae0e (MD5)
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Applications of long storage time optical cavities
… In particular, for those cavities that deal with quantum systems, minimizing the cavity loss is crucial because any loss can easily degrade the fragile quantum states. One such example is a quantum noise filter cavity for gravitational wave (GW) detectors, where an optical cavity is necessary for …
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Squeezed light sources for current and future interferometric gravitational-wave detectors
… interferometric detectors, is broadly limited by quantum noise. Improving on the quantum noise will increase the astrophysical range of the detectors, and improve the source parameter estimation. One way to reduce quantum noise is to inject audio- band squeezed vacuum states into the detection …
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Squeezed light sources for current and future interferometric gravitational-wave detectors
… interferometric detectors, is broadly limited by quantum noise. Improving on the quantum noise will increase the astrophysical range of the detectors, and improve the source parameter estimation. One way to reduce quantum noise is to inject audio- band squeezed vacuum states into the detection …
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Expanding the Reach of Quantum Enhanced Gravitational-Wave Detectors
… at the cutting edge of quantum noise limited sensitivity. The introduction of non-classical squeezed states to reduce quantum shot noise during the third gravitational wave observing run O3 ushered in the era of quantum-enhanced gravitational wave interferometry. This …
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ΘΕΩΡΙΑ ΤΩΝ ΠΕΠΙΕΣΜΕΝΩΝ (SQUEEZED) ΚΑΤΑΣΤΑΣΕΩΝ ΚΑΙ ΕΦΑΡΜΟΓΕΣ ΣΤΗΝ ΚΒΑΝΤΙΚΗ ΟΠΤΙΚΗ
… OF VIEW, THE THEORY OF STATES THAT HAVE SQUEEZED NOISE IN THE ONE QUADRATURE COMPONENT AND CORRESPONDINGLY INCREASED IN THE OTHER (SQUEEZED STATES). IN THE PRESENT STUDY WE DEVELOPED FURTHER THE YUEN THEORY STUDYING THE SQUEEZED STATES IN THE Q-REPRESENTATION. ALSO WE DIDTHE SAME FOR THE NUMBER …
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The Generation and Detection of Squeezed Microwave Photons Realized using Traveling-Wave Parametric Amplifiers
… essential metrological technique used to reduce quantum noise in applications spanning gravitational wave detection, biological microscopy, and quantum information science. In circuit quantum electrodynamics, Josephson parametric amplifiers play a crucial role in quantum-limited amplification and …
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Revisiting physics of quantum bits
Advancements in the technology of quantum bits invoke more precise calculations for decoherence and dissipative effects. In this thesis, the physics of truncated two level systems is revisited and it is shown that in some systems, such as in triple-junction superconducting flux qubit, environmental …
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Flash Memory For Ubiquitous Hardware Security Functions
… and information hiding. Use of random telegraph noise (a type of quantum noise source in highly scaled Flash memory cells) enables high quality true random number generation at a rate up to 10Kbits / second. A scheme based on partial programming exploits process variation in threshold voltages to …
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Enhancing Fidelity through Gate Decomposition: A Strategy to Mitigate Quantum Crosstalk on NISQ Computers
<p>Quantum computing aims to tackle computationally intricate problems that are infeasible for classical computers. However, as quantum processors improve in scaling their sizes, their complexity also increases. Due to this complexity, there is a significant detrimental effect of quantum noise …
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Mode Matching sensing in Frequency Dependent Squeezing Source for Advanced Virgo plus
… into the main beam reducing the effect of the quantum noise reduction technique. This issue will become more critical in the implementation of the Frequency Dependent Squeezing. This technique is an upgrade of the Frequency Independent Squeezing one. The new setup will increase the complexity …
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