Quantum teleportation is unreal.

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Quantum teleportation is a useless, meaningless concept.

[ Quantum teleportation can Not send any real things, let alone faster-than-light information. ]

(Fig.1)  ↓ Just using classical polarized light.  No quantum mechanics

The misleading media often tries to deceive gullible laypersons by falsely claiming quantum mechanical teleportation may send information faster-than-light.

But in fact, quantum teleportation can Not send any real things, much less faster-than-light information or communication ( this 8th last paragraph ).

Because if quantum teleportation can transmit information faster-than-light like Star Trek, it contradicts another current mainstream theory = Einstein relativity which prohibits any things from moving faster than light.

If quantum teleportation cannot send any real information, what on earth are physicists doing and sending in quantum teleportation experiments ?  They are just wasting time and money in illusion ?

Quantum teleportation experiments started from a dubious research paper published in top journal Nature in 1997.

In this Nature paper, physicists split classical laser light into two lights ( which they like to call photon ) one of which was prepared to have vertical polarization and another light was prepared to have horizontal polarization (= Fig.1, lights ② and ③ ) through some crystal.

Another light source sent light ① (= initial state ) to the light detector of Alice to which light ② was also heading ( Fig.1 ).

And they measured polarizations of lights ① and ② at the Alice light detector.  ← That's all they did in quantum teleportation experiments.
No information transfer or teleportation happened.

Quantum mechanics tries to intentionally misinterpret this simple act of "measurement of classical light polarization" as an "illusory quantum teleportation" which actually sends nothing.

Measuring (classical) light's polarization.  = (illusory) quantum teleportation which sends No information or does No real work.  ← nonsense

If you want to send real information such as polarization of light in this system ( this p.2 ), you have to rely on ordinary classical transmission method which cannot send any information faster than light.

So in this weird quantum mechanics, just the "measurement of classical light polarization" is falsely treated as fantasy "quantum teleportation".  Why ?

 

Nothing is 'teleported' between two lights !

[ Quantum teleportation is just a "classical" phenomenon. ]

(Fig.2)  "Measure" classical light polarization = quantum "teleportation" ?

The principle of quantum teleportation is simple, absurd, and scientifically meaningless.

The Alice light detector is prepared to detect light as photon (= actually, photon detector detects electrons ejected by classical light, No illusory photons can be detected. ), only when lights ① and ② have different polarizations (ex. light ① has vertical polarization, and light ② has horizontal polarization, as seen in Fig.2, though each light polarization state is unknown until a detector measures light. )

So when the Alice detector can detect lights, it means light ① and ② have different polarizations ( which light ① or ② has vertical polarization is unknown ).

And lights ② and ③ generated through a crystal are prepared to have different polarizations (= when one light of ② and ③ has vertical polarization, the other light has horizontal polarization ).

As a result, lights ① and ③ have the same polarization (= here, both lights ① and ③ have the same vertical polarization ).

Because they arrange lights ① and ② have different polarizations, lights ② and ③ also have different polarizations. ← It means lights ① and ③ have the same polarization.

Quantum mechanics makes a ridiculous claim this artificially-prepared state of lights ① and ③ having the same polarization means the polarization of light ① is "teleported" to light ③, though nothing is teleported or sent between these two lights ① and ③ ( this p.6 ), except classical lights which are measured at the detector.

All they did was prepare lights with various polarizations which were adjusted beforehand and measure two of them in Alice detector.  ← Nothing was transmitted between two lights ① and ③ where illusory teleportation is said to occur.

 

Quantum mechanical unrealistic interpretation.

[ Light polarization is unknown until measurement = quantum parallel worlds ?  Measurement triggers superluminal entanglement ?  ← Nonsense. ]

(Fig.3)  Whether each light has vertical or horizontal polarization is unknown. = each light existing in two different parallel worlds !?

In this quantum teleportation experiment, whether each light has vertical or horizontal polarization is unknown until measurement by light detector.

Quantum mechanics ridiculously claims this unknown polarization state is called "superposition", and each light (= photon ) may exist in fictional multiple parallel worlds where each world is supposed to have a photon with each different polarization (= one world has vertically-polarized light, and another world has horizontally-polarized light according to fantasy quantum mechanics ).

It's like a fictional quantum mechanical cat can be dead and alive at the same time existing in two different parallel worlds until they are observed or measured by detectors.

When laser beam through some crystal is prepared to split into two lights with different polarizations (= one light has vertical and the other light has horizontal polarization,  which light has which polarization is unknown ), They like to call these two prepared classical polarized lights "quantum entanglement" which actually means nothing.

↑ These are just classical phenomena using classical polarized light, No fantasy quantum mechanics is involved.

In two lights prepared to have different polarizations, when we measure and know one of lights has vertical polarization, it instantly (= faster-than-light entanglement !? ) determines the other light has horizontal polarization ( this p.5 ).

↑ This is natural and No faster-than-light spooky action or entanglement.  Because they just prepared two lights with different polarizatios (= one is vertical, the other is horizontal ) beforehand.

So quantum entanglement or teleportation is just an "act of measurement" of some state such as light polarization which is adjusted beforehand, Not an act of sending some real objects, much less faster-than-light transmission.

When we prepare two lights with the same polarization, the moment we measure and know one of light has vertical polarization, it instantly (= faster-than-light entanglement ? ) determines the other light also has vertical polarization.

Prepare two lights with particular polarizations.  ← Measure one of light polarization.  ←It determines the other light polarization.  ← It means faster-than-light entanglement or teleportation !?  ← Nonsense logic.

So quantum teleportation or entanglement actually sends nothing.  Quantum mechanics pursues illusion in vain.

 

What "measurement" is falsely treated as illusory teleportation ?

[ Two classical lights interfering through ordinary beam splitter are "measured" = "Teleport" light polarization state to the 3rd distant light ? ]

(Fig.4)  ↓ Quantum teleportation uses classical light interference.

Quantum teleportation is a useless and meaningless concept which cannot send any real information faster than light.

Quantum mechanics ridiculously tries to treat just the "act of measurement of classical light polarization" as fictional "quantum teleportation" of copying (= though actually trasmitting nothing in teleportation ) one light polarizaton state into distant light.

Whether each light has vertical or horizontal polarization is unknown until measurement, and the Alice detector has to choose only the state where lights ① and ② have different polarizations (= one light has vertical, and the other light has horizontal polarization ) excluding other states where lights ① and ② have the same polarization, in order to claim achieving quantum teleportation.

How could they choose only the state of two lights ① and ② with different polarizations ?  They used a special beam splitter where only light reflecting off one side of the beam splitter changes its phase by a half-wavelength.

Hence, if two lights ① and ② have the same polarization, these lights interfere with each other destructively, and light ( or photon ) exiting from this destructive-interference side of the beam splitter cannot be detected at the Alice detector.

If two lights ① and ② have different polarizations (= perpendicular to each other, like vertical and horizontal polarizations ), these lights cannot interfere ( destructively ) with each other, hence, these two photon can be safely detected at the Alice detector ( this p.6, this p.3 left ).

Using this beam splitter, when the Alice detector detects light (= photon ), which means lights ① and ② have different polarizations, lights ① and ③ have the same polarization (= because ② and ③ have different polarizations ).  ← Polarization of light ① is teleported to distant light ③ just by measurement of light polarization without sending any real information ?

↑ This ridiculous, meaningless thing is what the current quantum mechanics is doing as (fictional) "science."

 

Quantum teleportation research is meaningless, a waste of money.

[ Because quantum teleportation sends No information, and Not faster-than-light at all. ]

(Fig.5)   Teleportation = Nothing is sent.  = meaningless experiments

Contrary to the media-hype, quantum teleportation can Not send any information, much less faster than light ( this 4th paragraph ).  Forget Star Trek-like fiction.

Quantum teleportation makes a contradictory claim that they do Not send anything, but can "teleport" some "ghost-like" thing called quantum state.  ← Nonsense.

For example, in Fig.5, there is No direct physical link between two lights ① and ③, and Nothing is sent between them.
But unscientific quantum mechanics claims some supernatural "ghost-like pseudo-object" may be "sent (= teleported ? )" between lights ① and ③, where there is nothing moving faster than light.

In 2017, top journal Nature announced that Chinese physicists succeeded in "teleporting" light polarization information to a distant satellite.

The 6th last paragraph of this news just says "there's No way to use this property as an instantaneous messaging system. That's because even though the states of entangled particles are correlated, you can't know what they are before you measure them, nor can you control the state."

So quantum teleportation which cannot send any real things is meaningless, useless for any purposes.

In Chinese quantum teleportation research using satellite, they sent classical lights with the same polarization ( instead of different light polarizations ) to the ground light detector ( to which ① and ② lights with the same polarization version in this was sent ) and satellite ( to which ③ light with the same polarization with light ② in this was sent,  this paper p.3 ).

And when they "measured" two lights with the same polarization at the light detector on the ground, it instantly (= faster-than-light teleportation or entanglement !? ) determined that the light polarization sent to the distant satellite was also the same as the light on the ground.

Because they arrange lights ① and ② have the same polarization, lights ② and ③ also have same polarization. ← It means lights ① and ③ also have the same polarization.  ← Teleportation between polarizations of lights ① and ③ ?  ← Nonsense.

Nothing is sent in this research on quantum teleportation where all they did was "measure" light's property such as polarization by photon detector.

In the latest long-distance quantum teleportation research in 2020 conducted by NASA and Caltech team, they used the concept of time-bin encoding system instead of ordinary light polarization as information carried by light to be teleported ( this 8th paragraph ).

In usual teleportation researches, for example, physicists treat the horizontal light polarization as "0" and vertical light polarization as "1" as information carried by light ( or photon ).

In time-bin encoding method, for example, when light arriving at a slightly earlier time ( than the standard time ) is treated as "0", and light arriving at a slightly later time is treated as "1", which was arranged by passing lights through different paths with different lengths.

In Fig.5, NASA researchers sent three kinds of lights; ① = light arriving at the light detector slightly earlier (= corresponds to vertically-polarized light ), ② = light arriving at the detector slightly later (= corresponds to horizontally-polarized light ), and ③ = light arriving at a 44-km distant lab slightly earlier ( than the standard time ) corresponding to vertically-polarized light.

And the moment the light detector measured two lights ① and ② where one light was earlier-arriving (= corresponding to vertical polarization ) and the other light was later-arriving (= horizontal ), it determined that light ③ sent to the distant lab was the same earlier-arriving light as the light ①.

So they arrange lights ① and ② have different arriving times (= one is earlier and the other is later ), lights ② and ③ also have different arriving times. ← It means lights ① and ③ have the same arriving time.  ← light ① state is "teleported (= though sends nothing )" to the distant light ③ ?  ← nonsense.

They try to identify the measurement at the light detector with "(illusory) teleportation" of the light ① information ( encoded as earlier arriving ) to the distant light ③, though nothing is actually transmitted between two lights ① and ③.

These ridiculous and scientifically meaningless things are what the current quantum mechanical researchers are doing, wasting time.

 

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2021/1/7 updated. Feel free to link to this site.