Communication via a quantum loop gravity string?

Message boards : Science (non-SETI) : Communication via a quantum loop gravity string?
Message board moderation

To post messages, you must log in.

Previous · 1 · 2 · 3 · 4 · 5 · Next

AuthorMessage
Darth Beaver Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Avatar

Send message
Joined: 20 Aug 99
Posts: 6728
Credit: 21,443,075
RAC: 3
Australia
Message 1688866 - Posted: 7 Jun 2015, 8:48:38 UTC - in response to Message 1688860.  

Quantum computing is still a target. But quantum cryptography is used today to transmit cryptographic keys in a secure way.
Tullio


Tullio this may sound stupid but anyway . Is not what they call Quantum cryptographic just maths and not really anything to do with Quantum computing seeing as they have the keys ?

I guess what i'm asking is that it's not really anything to do with Quantum mechanics it's more just normal maths .
ID: 1688866 · Report as offensive
Profile tullio
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 8797
Credit: 2,930,782
RAC: 1
Italy
Message 1688874 - Posted: 7 Jun 2015, 9:56:46 UTC - in response to Message 1688866.  

No, it is using one entanglement feature. If anybody tries to intercept the message (man in the middle) the receiver is immediately alerted by a quantum jump.
Tullio
ID: 1688874 · Report as offensive
Profile janneseti
Avatar

Send message
Joined: 14 Oct 09
Posts: 14106
Credit: 655,366
RAC: 0
Sweden
Message 1688906 - Posted: 7 Jun 2015, 13:25:35 UTC - in response to Message 1688570.  

Though I think that we have commented before on Quantum Computing, let me reiterate some thoughts.

The word Quantum is applied to more than one phenomenon in Physics. It is easy to understand that energy from a heated body (atom or Black Body) comes only in discrete amounts (or quanta) as the electron moves from one allowable orbit (energy level) to another. Of course you must accept the Copenhagen interpretation of the atom which in this one case seems to: make sense, be easy to understand and is correct.

As for quantum computing however I have not seen a diagram of a quantum Logic circuit nor an explanation of its operation and why it is faster than modern processor chips. The same goes for computing architecture and the programming to exploit the hardware architecture. These may exist; but for an intelligent discussion, they should be put forward and explained in terms a computer-savvy person could understand.

The fact that you get QUBITs doesn't excite me since you have to know which state is the correct state.

The concept of the qubit was unknowingly introduced by Stephen Wiesner in 1983, in his proposal for unforgeable quantum money, which he had tried to publish for over a decade.[1][2]
In quantum computing, a qubit (/ˈkjuːbɪt/) or quantum bit is a unit of quantum information—the quantum analogue of the classical bit. A qubit is a two-state quantum-mechanical system, such as the polarization of a single photon: here the two states are vertical polarization and horizontal polarization. In a classical system, a bit would have to be in one state or the other. However quantum mechanics allows the qubit to be in a superposition of both states at the same time, a property which is fundamental to quantum computing.
An important distinguishing feature between a qubit and a classical bit is that multiple qubits can exhibit quantum entanglement. Entanglement is a nonlocal property that allows a set of qubits to express higher correlation than is possible in classical systems.
http://en.wikipedia.org/wiki/Qubit
ID: 1688906 · Report as offensive
Profile janneseti
Avatar

Send message
Joined: 14 Oct 09
Posts: 14106
Credit: 655,366
RAC: 0
Sweden
Message 1688911 - Posted: 7 Jun 2015, 13:49:02 UTC - in response to Message 1688866.  

Quantum computing is still a target. But quantum cryptography is used today to transmit cryptographic keys in a secure way.
Tullio

Tullio this may sound stupid but anyway . Is not what they call Quantum cryptographic just maths and not really anything to do with Quantum computing seeing as they have the keys ?
I guess what i'm asking is that it's not really anything to do with Quantum mechanics it's more just normal maths .

Glenn:)
In a predictive sense, quantum computers may become a technological reality; it is therefore important to study cryptographic schemes that are allegedly secure even against adversaries with access to a quantum computer. The study of such schemes is often referred to as post-quantum cryptography.
http://en.wikipedia.org/wiki/Quantum_cryptography#Post-quantum_cryptography
So you use both quantum cryptography and quantum mechanics strange phenomenas.

Maybe we will see quantum Money in the future:)
http://en.wikipedia.org/wiki/Quantum_money
ID: 1688911 · Report as offensive
Darth Beaver Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Avatar

Send message
Joined: 20 Aug 99
Posts: 6728
Credit: 21,443,075
RAC: 3
Australia
Message 1689081 - Posted: 8 Jun 2015, 4:27:03 UTC - in response to Message 1688874.  

Thank's Tuillio ....

I didn't explain what i was asking properly .

I understand what your saying about the entanglement as part of a moving particule , but with computers !!

cryptography !!, code breaking , MATH is what i hear , TILT !!!!!!!
ID: 1689081 · Report as offensive
Darth Beaver Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Avatar

Send message
Joined: 20 Aug 99
Posts: 6728
Credit: 21,443,075
RAC: 3
Australia
Message 1689087 - Posted: 8 Jun 2015, 4:54:57 UTC - in response to Message 1688911.  

Janne they call it Quantum cryptography why Quantum ?

cryptography is code breaking .....

why the word Quantum to me the 2 words are separate and have different meanings
ID: 1689087 · Report as offensive
Profile tullio
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 8797
Credit: 2,930,782
RAC: 1
Italy
Message 1689107 - Posted: 8 Jun 2015, 7:06:06 UTC - in response to Message 1689087.  
Last modified: 8 Jun 2015, 7:15:58 UTC

Cryptography is both crypting and decrypting. There was a "crypt" tool on UNIX, you had to choose a key. Then it was taken off to the request of FBI.
In the RSA crypting scheme you have both a public and a private key. The problem is: how do you transmit the private key in a secure way? This is where quantum cryptography comes in. There is a method developed by Anton Zeilinger at the University of Vienna in which you can send a private key to a receiver. If somebody tries to intercept it, the receiver is immediately warned and he will not use the key. This was used in the Swiss Cantonal elections and is used by banks as routine.
Tullio
ID: 1689107 · Report as offensive
Profile janneseti
Avatar

Send message
Joined: 14 Oct 09
Posts: 14106
Credit: 655,366
RAC: 0
Sweden
Message 1689124 - Posted: 8 Jun 2015, 8:44:17 UTC - in response to Message 1689087.  
Last modified: 8 Jun 2015, 8:47:25 UTC

Janne they call it Quantum cryptography why Quantum ?
cryptography is code breaking .....
why the word Quantum to me the 2 words are separate and have different meanings

It was Stephen Wiesner who came up with the idea of Quantum information.
As a graduate student at Columbia University in New York in the late 1960s and early 1970s, he discovered several of the most important ideas in quantum information theory, including quantum money (which led to quantum key distribution), quantum multiplexing [1] (the earliest example of oblivious transfer) and superdense coding[2] (the first and most basic example of entanglement-assisted communication).

In physics and computer science, quantum information is information that is held in the state of a quantum system. Quantum information is the basic entity that is studied in the growing field of quantum information theory, and manipulated using the engineering techniques of quantum information processing. Much like classical information can be processed with digital computers, transmitted from place to place, manipulated with algorithms, and analyzed with the mathematics of computer science, so also analogous concepts apply to quantum information.
http://en.wikipedia.org/wiki/Quantum_information
ID: 1689124 · Report as offensive
KLiK
Volunteer tester

Send message
Joined: 31 Mar 14
Posts: 1304
Credit: 22,994,597
RAC: 60
Croatia
Message 1689136 - Posted: 8 Jun 2015, 10:28:26 UTC

1st OT:
to have a FTL transmission over the Space distances, which might come in handy in missions like Cassini, Juno, Deep Horizons, Voyagers or Mars missions, you first have to find some paticle that is FTL...neutrinos & tachions are candidates!
Then you have to constract a neutrino or tachion transmitter & receiver, which we don't have commercially awailable...only test subjects, which is supposed to be used for military, 'cause it avoids solid walls of stone or matter like water - so it would be perfect to communicate without surfacing, etc...
list of NASA curent missions: http://www.jpl.nasa.gov/missions/?type=current

Also, back to science...right now all communications to Mars mission is down, 'cause Mars is directly opposite to Earth right now...that means that with neutrino transmitter-receiver we might have rovers operational now & connection to orbiters - unless Suns dense matter would slow down & destroy neutrinos...
When the Mars come back in contact it will be 22min away by communication! So having neutrinos to cut that down a little, would be also nice!


Imagine how a mission like Voyager would be closer for communication? Now a signal fomr V1 takes over 18h to come to Earth...18h! ;)


But so far, we don't have it...maybe soon? :)


non-profit org. Play4Life in Zagreb, Croatia, EU
ID: 1689136 · Report as offensive
Profile tullio
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 8797
Credit: 2,930,782
RAC: 1
Italy
Message 1689140 - Posted: 8 Jun 2015, 10:40:11 UTC

Voyager1 is still sending and receiving messges due to its plutonium thermoelectricity generator. It should stop in 2025.
Tullio
ID: 1689140 · Report as offensive
Profile William Rothamel
Avatar

Send message
Joined: 25 Oct 06
Posts: 3756
Credit: 1,999,735
RAC: 4
United States
Message 1689173 - Posted: 8 Jun 2015, 13:52:31 UTC - in response to Message 1689136.  
Last modified: 8 Jun 2015, 13:53:15 UTC

We need to revisit and remind ourselves what the definition of "Information" is. Next we need to ask ourselves if information can be transmitted faster than the speed of light.
ID: 1689173 · Report as offensive
Profile tullio
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 8797
Credit: 2,930,782
RAC: 1
Italy
Message 1689194 - Posted: 8 Jun 2015, 15:01:27 UTC - in response to Message 1689173.  

The first question is soon solved."A Mathematical Theory of Communication", by Claude E.Shannon, 1948.
The second is more difficult . I personally believe that entanglement is not a way to communicate, but Quantum Theory has not beeen understood completely, and it is still under discussion, so I reserve my bet.
Tullio
ID: 1689194 · Report as offensive
KLiK
Volunteer tester

Send message
Joined: 31 Mar 14
Posts: 1304
Credit: 22,994,597
RAC: 60
Croatia
Message 1689423 - Posted: 9 Jun 2015, 8:23:30 UTC - in response to Message 1689173.  

We need to revisit and remind ourselves what the definition of "Information" is. Next we need to ask ourselves if information can be transmitted faster than the speed of light.

I know what you mean...that we need a buffer & computer that is FTL inside it!

Otherwise it would transmit only on light speed...


non-profit org. Play4Life in Zagreb, Croatia, EU
ID: 1689423 · Report as offensive
Vern

Send message
Joined: 24 May 15
Posts: 3
Credit: 16,826
RAC: 0
United States
Message 1689464 - Posted: 9 Jun 2015, 12:51:08 UTC - in response to Message 1687858.  

If we one day are able to send an quantum entangled somewhere at the speed of light, thus making entanglement more practical for communication.

Also, entanglement would only be used between two places with intelligent beings being at both places. So one of them could easily take an entangled particle with them
ID: 1689464 · Report as offensive
Profile janneseti
Avatar

Send message
Joined: 14 Oct 09
Posts: 14106
Credit: 655,366
RAC: 0
Sweden
Message 1689467 - Posted: 9 Jun 2015, 13:19:56 UTC - in response to Message 1689173.  
Last modified: 9 Jun 2015, 13:24:54 UTC

We need to revisit and remind ourselves what the definition of "Information" is.

I Think you can say that Information is the opposite of entropy.
If you want to reconstruct something you need information, like a blue-print.
Actually information can't be destroyed and the Information is still there even after those objects don't exist anymore.

Next we need to ask ourselves if information can be transmitted faster than the speed of light.

It doesnt need to be FTL since it useful in short distances as well.
Military and finance like this idea very much.
Impossible to break the keys and you cannot block communication.
ID: 1689467 · Report as offensive
Profile tullio
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 8797
Credit: 2,930,782
RAC: 1
Italy
Message 1689483 - Posted: 9 Jun 2015, 14:17:11 UTC - in response to Message 1689467.  

Information can be destroyed. Haven't you erased a ROM? But this increases entropy.
Tullio
ID: 1689483 · Report as offensive
Profile janneseti
Avatar

Send message
Joined: 14 Oct 09
Posts: 14106
Credit: 655,366
RAC: 0
Sweden
Message 1689507 - Posted: 9 Jun 2015, 15:27:03 UTC - in response to Message 1689483.  
Last modified: 9 Jun 2015, 15:33:01 UTC

Information can be destroyed. Haven't you erased a ROM? But this increases entropy.
Tullio

Nope.
Leonard Susskind and Stephen Hawking has the answers. And others of course.
For instance black hole. Every matter that get destroyed when falling in are "saved" as information in the event horizon.
So that means that you can reconstruct the matter again.

Just following the law of physics:)

btw Leonard Susskind began working as a plumber at the age of 16.
He use his experience from that time to explain what information is:)
ID: 1689507 · Report as offensive
Profile tullio
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 8797
Credit: 2,930,782
RAC: 1
Italy
Message 1689515 - Posted: 9 Jun 2015, 15:50:48 UTC - in response to Message 1689507.  

There is a lecture at Cambridge University center of Quantum Computing tomorrow. Here is its abstract:

The quantization of energy is of fundamental importance for quantum thermodynamics, even for macroscopic systems. The fragility of quantum coherence naturally makes it less so. However the scale of control of the dynamics of small systems in current experiments is such that understanding basic constraints on how quantum coherences can evolve/be manipulated in a thermodynamic setting is of interest. I will discuss a few such constraints that go beyond free-energy type relations, although the most general form of the problem remains open.

Tullio
ID: 1689515 · Report as offensive
Profile tullio
Volunteer tester

Send message
Joined: 9 Apr 04
Posts: 8797
Credit: 2,930,782
RAC: 1
Italy
Message 1689657 - Posted: 10 Jun 2015, 5:40:50 UTC - in response to Message 1689507.  

If you format your hard disk you will destroy all infornations contained in it and your computer will not boot, no matter what Hawking and Susskind may say.
Tullio
ID: 1689657 · Report as offensive
Profile William Rothamel
Avatar

Send message
Joined: 25 Oct 06
Posts: 3756
Credit: 1,999,735
RAC: 4
United States
Message 1689728 - Posted: 10 Jun 2015, 9:58:21 UTC - in response to Message 1689725.  

It's energy that cannot be created or destroyed--only transformed.

It also occurs to me that information can be destroyed by noise--that's the whole essence of Claud Shannon's Information Theory. If the information is there but nobody can see it anymore then I would call that destroyed.
ID: 1689728 · Report as offensive
Previous · 1 · 2 · 3 · 4 · 5 · Next

Message boards : Science (non-SETI) : Communication via a quantum loop gravity string?


 
©2024 University of California
 
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.