Continuous Real-Time Tracking of a Quantum Phase Below the Standard Quantum Limit.

08:00 EDT 14th June 2019 | BioPortfolio

Summary of "Continuous Real-Time Tracking of a Quantum Phase Below the Standard Quantum Limit."

We propose a scheme for continuously measuring the evolving quantum phase of a collective spin composed of N pseudospins. Quantum nondemolition measurements of a lossy cavity mode interacting with an atomic ensemble are used to directly probe the phase of the collective atomic spin without converting it into a population difference. Unlike traditional Ramsey measurement sequences, our scheme allows for real-time tracking of time-varying signals. As a bonus, spin-squeezed states develop naturally, providing real-time phase estimation significantly more precise than the standard quantum limit of Δϕ_{SQL}=1/sqrt[N]  rad.


Journal Details

This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 233602


DeepDyve research library

PubMed Articles [24309 Associated PubMed Articles listed on BioPortfolio]

Impacts of respiratory phase shifts on motion-tracking accuracy of the CyberKnife Synchrony Respiratory Tracking System.

The Synchrony Respiratory Tracking System (SRTS) component of the CyberKnife Robotic Radiosurgery System (Accuray, Inc., Sunnyvale CA) enables real-time tracking of moving targets by modeling the corr...

Quantum Ising model on the frustrated square lattice.

We investigate the role of a transverse field on the Ising square antiferromagnet with first (J_{1}) and second (J_{2}) neighbor interactions. Using a cluster mean-field approach, we provide a telltal...

Multiferroic quantum criticality.

The zero-temperature limit of a continuous phase transition is marked by a quantum critical point, which can generate physical effects that extend to elevated temperatures. Magnetic quantum criticalit...

Real-Time Estimation for Roll Angle of Spinning Projectile Based on Phase-Locked Loop on Signals from Single-Axis Magnetometer.

As roll angle measurement is essential for two-dimensional course correction fuze (2-D CCF) technology, a real-time estimation of roll angle of spinning projectile by single-axis magnetometer is studi...

Reliability of real-time continuous glucose monitoring in infants.

Neonatal hypoglycemia is a common and treatable risk factor for neurological impairment. Real-time continuous glucose monitoring (RT-CGM) can show glucose concentrations in real time. Using an alarm o...

Clinical Trials [13648 Associated Clinical Trials listed on BioPortfolio]

Primary Care - Continuous Glucose Monitoring

Introduction and objective: The key to optimal diabetes management is tight glucose control. Hemoglobin A1c is the gold standard to assess glycemic control but in cases of unrecognized hyp...

Personalized Quantum Sonotherapy in Regional Anesthesia

The objetive of the study is to evaluate the effect of personalized quantum sonotherapy on the level of anxiety and pain in outpatients schedule for orthopedic surgery under regional anest...

Use of Real-Time Continuous Glucose Monitoring System in Patients With Type 1 Diabetes Mellitus

The purpose of this study is to determine whether a real-time continuous glucose monitoring system is able to improve HbA1c in patients suffering from type 1 diabetes compared to conventio...

Real-Time kV Imaging vs. Real-Time 3D Patient Surface Tracking for Head & Neck Cancer

To determine if a new optical system that can track a patient's movement during treatment can be used to measure motion and allow for motion adjustments in order to decrease the amount of ...

Accuracy and Safety of Real Time Continuous Glucose Monitoring Before, During and After Surgery

The purpose of this study is to determine the safety and accuracy of the Real-Time Continuous Glucose monitoring System (RT-CGMS)in measuring glucose in patients scheduled for surgery; bef...

Medical and Biotech [MESH] Definitions

Ultrasonography applying the Doppler effect combined with real-time imaging. The real-time image is created by rapid movement of the ultrasound beam. A powerful advantage of this technique is the ability to estimate the velocity of flow from the Doppler shift frequency.

Colloids with a solid continuous phase and liquid as the dispersed phase; gels may be unstable when, due to temperature or other cause, the solid phase liquefies; the resulting colloid is called a sol.

Two-phase systems in which one is uniformly dispersed in another as particles small enough so they cannot be filtered or will not settle out. The dispersing or continuous phase or medium envelops the particles of the discontinuous phase. All three states of matter can form colloids among each other.

Continuous frequency distribution of infinite range. Its properties are as follows: 1, continuous, symmetrical distribution with both tails extending to infinity; 2, arithmetic mean, mode, and median identical; and 3, shape completely determined by the mean and standard deviation.

Colloids with liquid continuous phase and solid dispersed phase; the term is used loosely also for solid-in-gas (AEROSOLS) and other colloidal systems; water-insoluble drugs may be given as suspensions.

Quick Search

DeepDyve research library

Searches Linking to this Article