Difference between revisions of "Quantum Measurement"
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==Context== | ==Context== | ||
===First kind of quantum measurement=== | ===First kind of quantum measurement=== | ||
| − | + | The first kind of quantum measurement, also known as the projective measurement, is a measurement that completely collapses the quantum system into one of its possible states. This type of measurement is irreversible and provides a definite outcome.<ref>Physics Forum, ''Quantum measurement: first kind vs non-demolition'' 2012-08-09 https://www.physicsforums.com/threads/quantum-measurement-first-kind-vs-non-demolition.626599/</ref> | |
===Second kind of quantum measurement=== | ===Second kind of quantum measurement=== | ||
| − | Non-demolition measurement is a type of quantum measurement that does not entirely collapse the system, but instead provides information about the system while still preserving its superposition of states. This type of measurement is used in quantum systems that require continuous monitoring without disturbing the system. What is the difference between the first kind and non-demolition measurement? The main difference between the first kind and non-demolition measurement is the effect they have on the quantum system. First kind measurements completely collapse the system, while non-demolition measurements only provide partial information while preserving the superposition of states. Non-demolition measurements are also reversible, while first kind measurements are irreversible.<ref>''Nondestructive Detection of an Optical Photon'' 2013-11-14 https://www.science.org/doi/10.1126/science.1246164</ref> | + | Non-demolition measurement is a type of quantum measurement that does not entirely collapse the system, but instead provides information about the system while still preserving its superposition of states. This type of measurement is used in quantum systems that require continuous monitoring without disturbing the system. What is the difference between the first kind and non-demolition measurement? The main difference between the first kind and non-demolition measurement is the effect they have on the quantum system. First kind measurements completely collapse the system, while non-demolition measurements only provide partial information while preserving the superposition of states. Non-demolition measurements are also reversible, while first kind measurements are irreversible.<ref>Andreas Reiserer, Stephan Ritter and Gerhard Rempe, ''Nondestructive Detection of an Optical Photon'' 2013-11-14 https://www.science.org/doi/10.1126/science.1246164</ref> |
==References== | ==References== | ||
[[Category: Physics]] | [[Category: Physics]] | ||
Revision as of 19:01, 22 December 2024
Contents
Full Title
Quantum Measurement is the process of obtaining information about a quantum system, such as its position or momentum. This process involves interacting with the system and causing it to collapse from a superposition of states to a single definite state.
Context
First kind of quantum measurement
The first kind of quantum measurement, also known as the projective measurement, is a measurement that completely collapses the quantum system into one of its possible states. This type of measurement is irreversible and provides a definite outcome.[1]
Second kind of quantum measurement
Non-demolition measurement is a type of quantum measurement that does not entirely collapse the system, but instead provides information about the system while still preserving its superposition of states. This type of measurement is used in quantum systems that require continuous monitoring without disturbing the system. What is the difference between the first kind and non-demolition measurement? The main difference between the first kind and non-demolition measurement is the effect they have on the quantum system. First kind measurements completely collapse the system, while non-demolition measurements only provide partial information while preserving the superposition of states. Non-demolition measurements are also reversible, while first kind measurements are irreversible.[2]
References
- ↑ Physics Forum, Quantum measurement: first kind vs non-demolition 2012-08-09 https://www.physicsforums.com/threads/quantum-measurement-first-kind-vs-non-demolition.626599/
- ↑ Andreas Reiserer, Stephan Ritter and Gerhard Rempe, Nondestructive Detection of an Optical Photon 2013-11-14 https://www.science.org/doi/10.1126/science.1246164
