Quantum cloning for absolute radiometry.
نویسندگان
چکیده
In the quantum regime information can be copied with only a finite fidelity. This fidelity gradually increases to 1 as the system becomes classical. In this Letter we show how this fact can be used to directly measure the amount of radiated power. We demonstrate how these principles can be used to build a practical primary standard.
منابع مشابه
Ultraviolet radiometry with synchrotron radiation and cryogenic radiometry.
The combination of a cryogenic radiometer and synchrotron radiation enables detector scale realization in spectral regions that are otherwise difficult to access. Cryogenic radiometry is the most accurate primary detector-based standard available to date, and synchrotron radiation gives a unique broadband and continuous spectrum that extends from x ray to far IR. We describe a new cryogenic rad...
متن کاملQuantum mechanics investigation of acid dissociation constant of carboxylic acids in aqueous solution
According to the Bronsted definition, any compound which has a hydrogen atom is an acid, since itmay be lost as a proton. A thermodynamical cycle is proposed to calculate absolute pKa values forBronsted acids in aqueous solution. The equilibrium of dissociation of a Bronsted acid depends onthe interaction of the acid and its conjugate base with solvent molecules. There fore the pKa valuedepends...
متن کاملTOPICAL REVIEW Quantum radiometry
Conventionally defined, radiometry is the field that studies the measurement of electromagnetic radiation in terms of its power, spectral characteristics, and other parameters. The term applies to electromagnetic radiation characterization in a wavelength range from nanometers to tens of microns and at all optical power levels. Because radiometry is defined so broadly, a wide variety of measure...
متن کاملGetting the Most from Your IR Camera
Radiometry is the measurement of radiant electromagnetic energy, especially that associated with the IR spectrum. It can be more simply defined as an absolute measurement of radiant flux. The typical unit of measure for imaging radiometry is radiance, which is expressed in units of Watts/(sr-cm2). (The abbreviation “sr” stands for steradian; a non-dimensional geometric ratio expressing the soli...
متن کاملThe Shiite Pluralistic Position on Human Cloning
With regard to human cloning or artificial human reproduction – and contrary to the opinions of Sunni scholars - Shiite thinkers have not held a unified position. After having surveyed a number of Shiite fatwas and analyses on the subject, this essay will classify them into four groups. The first group states that we are granted absolute permission to engage in human cloning; while the second g...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 105 8 شماره
صفحات -
تاریخ انتشار 2010