Rising KashmirRising KashmirRising Kashmir
  • Home
  • Top Stories
  • News
    • Kashmir
    • City
    • Jammu
    • Politics
  • Health
  • Anchor
  • Features
  • Interview
  • Video
Search

Archives

  • May 2025
  • April 2025
  • March 2025
  • February 2025
  • January 2025
  • December 2024
  • November 2024
  • October 2024
  • September 2024
  • August 2024
  • July 2024
  • June 2024
  • May 2024
  • April 2024
  • March 2024
  • February 2024
  • January 2024
  • December 2023
  • November 2023
  • October 2023
  • September 2023
  • August 2023
  • July 2023
  • June 2023
  • May 2023
  • April 2023
  • March 2023
  • February 2023
  • January 2023
  • December 2022
  • November 2022
  • October 2022
  • September 2022
  • August 2022
  • July 2022
  • June 2022
  • May 2022

Categories

  • Anchor
  • Breaking
  • Business
  • City
  • Developing Story
  • Editorial
  • Education
  • Features
  • Health
  • Interview
  • Jammu
  • Jammu and Kashmir News
  • Kashmir
  • Kashmir Tourism
  • Kath Bath
  • National
  • Opinion
  • Politics
  • Sports
  • Technology
  • Top Stories
  • Trending
  • Uncategorized
  • Video
  • Viewpoint
  • World
© 2022 Foxiz News Network. Ruby Design Company. All Rights Reserved.
Reading: Quantum Entanglement: The spooky world of quantum mechanics
Share
Notification Show More
Font ResizerAa
Rising KashmirRising Kashmir
Font ResizerAa
  • Home
  • Top Stories
  • News
  • Health
  • Anchor
  • Features
  • Interview
  • Video
Search
  • Home
  • Top Stories
  • News
    • Kashmir
    • City
    • Jammu
    • Politics
  • Health
  • Anchor
  • Features
  • Interview
  • Video
Follow US
© 2024. All Rights Reserved.
Rising Kashmir > Blog > Opinion > Quantum Entanglement: The spooky world of quantum mechanics
Opinion

Quantum Entanglement: The spooky world of quantum mechanics

JAVEED AHMAD SOFI
Last updated: November 18, 2022 10:06 pm
JAVEED AHMAD SOFI
Published: November 18, 2022
Share
6 Min Read
SHARE

It all began in 1927 at the fifth Solvay Conference in Brussels when Niels Bohr presented his arguments which became basis of Quantum mechanics.  Bohr believed that the particles (such as electrons) don’t have well defined properties (like position) until they are observed. The moment a particle is observed, it is forced to choose a position and that is the one which we observe. Before observation, the particle has no definite position but rather it has chance of being in all possible positions. This chance is not like the chance in classical objects. The chance in classical objects like toss of coin is due to lack of our knowledge.

 

If we know variables like initial force imparted to the coin, its rotations per second etc then we can predict its outcome with certainty.  But the chance in quantum mechanics is not due to lack of knowledge or technology but the chance in quantum mechanics is fundamental. It is inherent. It was this basic point which perturbed Einstein the most. He argued that particles have definite properties irrespective of whether observed or not. For him it was completely absurd that individual particles are ruled by chance. Einstein along with Padolsky and Rosen wrote up a thought experiment to show this absurd outcome.

 

Consider a spin zero particle decays into two different particles, say particle A and particle B, having opposite spin orientations. So if we measure particle A’s spin to be spin up we instantly knew that particle B’s spin is spin down.It seems to be simple but it is not. EPR (Einstein, Padolsky and Rosen) gave two alternatives for this:

 

First, according to Einstein’s view, both the particles have definite spin values (say spin up for particle A and spin down for particle B) from the moment of decay. The measurement merely reveals this pre-existing state. The Quantum theory, being incomplete, needs certain hidden variables to yield these definite values.

 

Second, the Quantum theory is complete and true then particles do settle on a spin up or down only when measured. So the moment we measure the spin of particle A to be spin up, the particle B instantly knew it and settles on spin down. But how does the particle B knew it. Measurement of particle A’s spin has a definite effect on particle B’s spin.This was called by Einstein “spooky action at a distance” and was latter dubbed as “ Entanglement” by Erwin Schrodinger.

 

This thought experiment can be compared to a machine that throws out balls of opposite colours in opposite directions, in the direction of observer A and observer B. So when the observer A catches a ball and sees that it is white, he immediately knows that observer B has caught a black one. According to Einstein’s view, the colour of the balls is pre-existing and the observation just makes the colour visible. But according to Quantum mechanics, the balls were neither black nor white until someone looked at them. When the ball of observer A turned white then the ball of observer B instantly knew it and turned black. We say the balls are entangled.

 

The problem languished for three decades until in 1964, John Bell translated the two EPR alternatives into a mathematical relationship known as Bell inequality. If the predictions of Quantum mechanics are correct, the Bell inequality is violated and if hidden variable theory is correct, the inequality is not violated. Bell predicted this but the way he predicted it is not suitable for experimental tests. In 1969, John Clauser not only derived the Bell inequality in such a way that it could be tested but he designed and performed the critical experiment himself along with then Ph.D. student  Stuart Freedman. In the experiment, pairs of photons were sent in opposite directions towards detectors that could measure their state of polarisation.

 

Clauser and Freedman showed that it violates Bell’s inequality. But the result was hardly conclusive because of various loopholes in the experiment. The most concerning was the locality loophole. If one of detectors could send a message to the other (at the speed of light) about their experimental results, so the detector settings must be quickly changed (in nanoseconds) while photons are on the fly. And it was Alain Aspect who proposed a way for doing this ultra speedy switch. His group’s experimental results, published in 1982, proved Quantum entanglement to be real. In 1998, Anton Zeilinger and his team improved on Aspect’s earlier work by conducting a Bell test over a then unprecedented distance of 400 metres and found Quantum mechanics as flawless as ever. John F. Clauser, Alain Aspect and Anton Zeilinger were awarded the Nobel Prize in Physics 2022 for their work on Quantum mechanics.

 

(Author teaches Physics at HSS Hawal Pulwama. He can be reached at [email protected])

Navigating Stress and Anxiety in Modern Times
The Pearl Of My Life
A Transformational Journey of Women Security and Empowerment in Railways
Tourism Development in Kashmir: Tackling connectivity and infrastructure issues
India-Pakistan Relations: A strategic shift beyond dialogue

Sign Up For Daily Newsletter

Be keep up! Get the latest breaking news delivered straight to your inbox.
By signing up, you agree to our Terms of Use and acknowledge the data practices in our Privacy Policy. You may unsubscribe at any time.
Share This Article
Facebook Whatsapp Whatsapp Copy Link Print
Previous Article ‘RBI Kehta Hai: Jaankar Baniye, Satark Rahiye’ campaign
Next Article Mega placement drive at Govt College of Edu, Jammu
Leave a Comment Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

1MFollowersLike
262kFollowersFollow
InstagramFollow
234kSubscribersSubscribe
Google NewsFollow

Latest News

Hyderpora underpass turns into cab stand, sparks safety concerns
City
May 26, 2025
Bear-Proof Corral unveiled to tackle human-wildlife conflict in Drass
Kashmir
May 26, 2025
SACPPE holds session to safeguard children from unexploded shells in Uri
Kashmir
May 26, 2025
‘Prem Visheshagya’ brings laughter to Natrangs’ Sunday theatre
Jammu
May 26, 2025

Recent Posts

  • Hyderpora underpass turns into cab stand, sparks safety concerns
  • Bear-Proof Corral unveiled to tackle human-wildlife conflict in Drass
  • SACPPE holds session to safeguard children from unexploded shells in Uri
  • ‘Prem Visheshagya’ brings laughter to Natrangs’ Sunday theatre
  • Admin spreads awareness on drug abuse in Sgr

Recent Comments

  1. SavePlus on AI and Behavioural Analytics in Gaming: Making the World of Gaming Better
  2. Parul on Govt acknowledges faulty streetlights on Narbal-Tangmarg road
  3. dr gora on Women Veterinarians and the Goal of Viksit Bharat
  4. jalwa game login on National Education Policy 2020: Transforming India’s Educational System
  5. Virender Bhat on Pahalgam Attack: A War on Humanity, Peace, and Kashmiriyat

Contact Us

Flat No 7,Press Enclave, Srinagar, 190001
0194 2477887
9971795706
[email protected]
[email protected]

Quick Link

  • E-Paper
  • About Us
  • Contact Us

Top Categories

Stay Connected

1.06MLike
262.5kFollow
InstagramFollow
234.3kSubscribe
WhatsAppFollow
Rising KashmirRising Kashmir
Follow US
© 2025. All Rights Reserved.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?