# Do wave functions actually collapse?

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## Top best answers to the question «Do wave functions actually collapse»

In quantum mechanics, wave function collapse **occurs when a wave function**—initially in a superposition of several eigenstates—reduces to a single eigenstate due to interaction with the external world… Significantly, the combined wave function of the system and environment continue to obey the Schrödinger equation.

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### 👋 Why normalize wave functions?

The reason why we normalize a wavefunction is the same reason why we should **normalize a probability distribution**. In position space for example, the inner product of a wave function and itself gives the probability of observing the object at the point in space.

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### 👋 Does light collapse wave function?

Light, being an EM wave, also undergoes “**wavefunction collapse**”, meaning that when interacting with anything else it will do so in a way consistent with a localized photon.

- Show wave functions are orthogonal?
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### 👋 Why does wave function collapse?

- In quantum mechanics, wave function collapse is said to occur when a wave function—initially in a superposition of several eigenstates—appears to reduce to a single eigenstate (by "observation").

- Can animals collapse the wave function?
- Can decoherence explain wave function collapse?
- Does consciousness collapse the wave function?

We've handpicked 24 related questions for you, similar to «Do wave functions actually collapse?» so you can surely find the answer!

Does wave function collapse happen instantaneously?Is collapse of the wave function instantaneous? - Quora. **Yes the collapse of a wave function is instantaneous**. No experiment to date has uncovered any finite speed for this collapse. The standard experiment to demonstrate quantum entanglement is the one involving 2 photons with entangled polarization.

Can Wavefunction Collapse Conserve Energy? The **answer may be yes**… For instance, in the CSL (Continuous Spontaneous Localization) model, the collapse due to an external noise field narrows the wave function in position space, thereby producing an increase of energy.

In quantum mechanics, wave function collapse occurs **when a wave function—initially in a superposition of several eigenstates—reduces to a single eigenstate due to interaction with the external world**. This interaction is called an "observation".

The 'wavefunction collapse' upon measurement is usually referred to as being a non-unitary transformation, **since it does not preserve the norm of the state vector**. Indeed, if a linear superposition like ψ+ϕ collapses to let's say just ϕ, then ||ψ+ϕ||≠||ϕ||.

For one spin particle in one dimension, to a particular state there corresponds **two wave functions**, Ψ(x, S_{z}) and Ψ(p, S_{y}), both describing the same state.

Well behaved wave function is **the wave function which is single valued, continuous and finite**. It must be single valued to get good probability. It should be continuous to have good probability. It should be finite to have good probability in case of trignometric function sin x.

**Schrödinger** subsequently showed that the two approaches were equivalent. In 1926, Schrödinger published the famous wave equation now named after him, the Schrödinger equation.

- Calculations of quantum decoherence predict apparent wave function collapse when a superposition forms between the quantum system's states and the environment's states. Significantly, the combined wave function of the system and environment continue to obey the Schrödinger equation.

Wigner (1961) feels that consciousness or the mind, **plays a more directly physical role, adding an extra term to the mathematical equations and hence, selecting one particular branch of the wave function and one particular result for the experiment**, thus producing the effect that von Neumann called collapse.

In quantum mechanics, wave function collapse occurs when **a wave function—initially in a superposition of several eigenstates—reduces to a single eigenstate due to interaction with the external world**. This interaction is called an "observation".

In quantum mechanics, wave function collapse occurs when a wave function—initially in a superposition of several eigenstates—reduces to a single eigenstate due to interaction with the external world. This interaction is called an "**observation"**.

- Collapse of the wave function is the transformation from a spread-out wave function to a localized particle. To understand this phenomenon, one must understand the meaning of “ wave function ,” which is described in its own article. Double Slit Experiment shooting one photon at a time.

#### When does the wave function collapse in Bohm?

- In Bohm interpretation
**the collapse**of**the wave function**happens when**the**observer introduces into**the**measured system some perturbation, which is inevitable when performing**the measurement**.**The**difference between**the measurement**and any other interaction is in that the perturbation introduced by**measurement**is unknown beforehand.

- WAVE EQUATIONS, WAVE FUNCTIONS AND ORBITALS According to the quantum mechanical concept, electrons in atoms and molecules are considered as ‘standing waves’ or ‘stationery waves’ (similar to vibrations in a stretched string, but in 3 dimensions). Properties of a wave Consider a standing wave in a stretched string.

- The
**wave**shaping**is**used to perform any one of the following functions. To hold the waveform to a particular d.c. level. To generate one wave form the other To limit the voltage level of the waveform of some presenting value and suppressing all other voltage levels in excess of the present level.

- There are three categories: Longitudinal
**wave*** s - Movement of the particles are parallel**to**the motion of the energy… Transverse**wave*** s - movement of the particles are at right angles (perpendicular) to the motion of the energy… Surface wave * s - particles travel in a circular motion. These waves occur at interfaces…

Wave Functions. A wave function (Ψ) is a mathematical function that **relates the location of an electron at a given point in space** (identified by x, y, and z coordinates) to the amplitude of its wave, which corresponds to its energy.

Pretty much the same thing as when ANY type wave activity overlaps. If a fluid wave from one source meets up with wave in the same fluid, but from a different source, you have overlapping waves. The result can be interference, both destructive and constructive. The same thing happens when you have EM waves (ie, light) coming from two different sources. This can happen if the EM radiation has a wavelength of one meter (ie, radio waves) or one angstrom (x-rays), or anything in between. Erwin Schroendinger hypothesized the usefulness (existence?) of a wave function, which can be used to accurately predict the behavior of sub-atomic particles. It has been found that, when predicting such behavior, one can assume that this wave function also acts like a fluid wave or a EM wave. You can accurately predict maxima and minima of the probability of an electron, over time, reaching a specific point in space given two possible paths for that electron. Simply assume that the two possible paths of the electron are like sources of this wave function, then assume the two wave functions overlap (just like other waves), and then do the math -- and, at the end, you have an accurate prediction of the probability that an electron will reach somewhere. Scientists still debate just what this MEANS -- is this wave function something REAL, or just a mathematical trick that just happens to work? No matter what the case, assuming an overlapping wave function is like other overlapping waves, allows us to predict what will happen.

Particles which exhibit antisymmetric states are called fermions. Antisymmetry gives rise to the Pauli exclusion principle, which **forbids identical fermions from sharing the same quantum state**… It states that bosons have integer spin, and fermions have half-integer spin.

- I must note that
**wave**collapses need not be negative or emotionally injurious. They may just**as**well be positive and bolster our self-esteem. The**wave collapse can**also be illustrated by our thought selection. Prior to the instant in which we select and attach to**a**thought, we are like the wave, in a state of potential.

- No, it doesn't
**collapse**to an eigenstate. Collapse to an eigenstate is a picture of an ideal measurement. In general**the**final state will not be describable by a**wave function**, because it's not a pure state, it is instead a mixed state.

- It appears that when the light photon is not being observed it exists in waveform, but at the moment of observation, the wave collapses and becomes a particle. The act of observing actually collapses the wave. Prior to making the observation the wave represents a state of pure potentiality.

- After the collapse, the system again evolves according to the Schrödinger equation. By explicitly dealing with the interaction of object and measuring instrument, von Neumann has attempted to create consistency of the two processes of wave function change.

- In von Neuman interpretation the
**collapse**of the**wave**function happens when the observer feels any qualia (feeling) depended on the measured value. In Bohm interpretation the collapse of the wave function happens when the observer introduces into the measured system some perturbation, which is inevitable when performing the measurement.