Does getting which-way info introduce a phase difference?

San K
Messages
905
Reaction score
1
does getting which-way info introduce a phase difference (or cause de-coherence) between both the "waves"?

and does erasure of which-way information restore coherence?
 
Last edited:
Physics news on Phys.org
a difference from what?

the 'which-way' information completely changes the state, like the slits be 1 and 2, then you have 1+2 without any information, then 1 OR 2 with information
you can't phase change your way between (1+2),(1),(2)
 
genericusrnme said:
a difference from what?

the 'which-way' information completely changes the state, like the slits be 1 and 2, then you have 1+2 without any information, then 1 OR 2 with information
you can't phase change your way between (1+2),(1),(2)

forgot to mention, sorry...

phase difference between two entangled photons (two-photon interference)
 
Which way information usually referes to dual-slit type experiments, there's only one photon there at anyone time so there is no enganglement.
 

Thread 'Quantum Entanglement is a Kinematic Fact, not a Dynamical Effect'

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
View full post »

Thread 'Quantum behaviour of an electron around a positively charged sphere'

If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!
View full post »

Similar threads

I Does an electron have a quantum phase frequency?
Replies
36
Views
4K
I How Do Gauge and Phase Symmetries Differ in Quantum Systems?
Replies
6
Views
2K
I Hidden phase in polarization tests of Bell's inequality?
Replies
49
Views
5K
I What does decoherence have to do with phases?
2
Replies
71
Views
5K
I Four Questions on vacuum phase transitions in the Universe...
Replies
29
Views
2K
A Schrodinger equation/Madelung equation phase transformation
Replies
32
Views
2K
I Mirrors, phase shifts, and position
Replies
4
Views
2K
Is coherence restored after erasure of which-way info?
Replies
10
Views
3K
Why Does Light Diminish with a Phase Difference of 5λ?
Replies
6
Views
821
I Physical interpretation of phase in solutions to Schrodinger's Eqn?
Replies
12
Views
4K

Hot Threads

Recent Insights

Back
Top