Questions tagged [teleportation]
Quantum teleportation is a process by which quantum information (e.g. the exact state of an atom or photon) can be transmitted (exactly, in principle) from one location to another, with the help of classical communication and previously shared quantum entanglement between the sending and receiving location. (Wikipedia)
75
questions
3
votes
0answers
43 views
Can someone elaborate how to use Qutrits to do teleportation? And the unitary operation Bob needs to do? [duplicate]
I can understand doing teleportation by using qubits, however, I am stuck there when it comes to qutrits and the operation Bob needs to perform. Suppose Alice and Bob are sharing the most entangled ...
2
votes
1answer
55 views
Can I keep data into qubit and teleport?
I was reading about teleportation I have some question about it. Can I keep normalized data (some customized data) on probability amplitudes (which are complex numbers) of a qubit (Alice's side)? ...
3
votes
1answer
74 views
In quantum teleportation, does Bob's qubit depend on Alice's $\alpha$ and $\beta$ coefficients?
Does applying an operation to one half of an entangled pair affect the other?
As in the case of quantum teleportation when Alice applies CNOT to her half of the pair and the qubit she wants to send ($\...
0
votes
2answers
44 views
How to fix an error : “ QiskitBackendNotFoundError: 'No backend matches the criteria' ”
I am trying to run the Quantum Teleportation Algorithm using Qiskit on Jupyter Notebook.
Here is my code below where I am finding an error -
...
3
votes
1answer
111 views
What can gate teleportation be used for in practice?
I was quite fascinated when I learned about gate teleportation, but I am struggling with understanding what it may be used for.
Sure, one can use ancillae bits to teleport gates into various parts of ...
5
votes
2answers
49 views
Why do quantum networks matter?
I'm very new to quantum computing, sorry if this is a dumb question.
I was reading in some lecture notes I found online that a quantum network could be created by using teleportation multiple times to ...
2
votes
1answer
78 views
Quantum teleportaion seems to occuring without entanglement in circuit (what's wrong)
Please, pardon the caption. No intention of making new theories. I am a bit confused about the quantum teleportation. I missed a hadamard gate before CNOT gate for creating the EPR pair. But the ...
2
votes
1answer
66 views
Can I teleport a string of 0s and 1s?
I have recently started with quantum computing and created a quantum teleportation circuit to transmit a qubit state from q_0 to ...
3
votes
1answer
72 views
Teleportation followed by measurement: Lowering communication cost
Suppose Alice and Bob have access to shared entanglement and a classical channel and wish to simulate the following quantum protocol. Alice sends over to Bob an $n$-qubit state which is not known to ...
5
votes
4answers
105 views
Quantum teleportation and the reality of quantum states
This question is perhaps philosophical but it's been confusing me. Suppose Alice is teleporting some qubit state $|\phi\rangle$ to Bob via the quantum teleportation protocol. After Alice applies the ...
2
votes
2answers
56 views
How to verify teleportation was successful in this circuit?
In this circuit (link), q0 is Alice's qubit and q1, q2 are entangled qubits given to Alice ...
1
vote
1answer
36 views
Composing teleportation circuit in Qiskit Circuit Composer
I'm trying to create the teleportation circuit in IBM Qiskit Circuit Composer.
...
4
votes
1answer
71 views
Why does describing a quantum state take an infinite amount of classical information? [duplicate]
In chapter 1 of Quantum Computation and Quantum Information by Michael A. Nielsen & Isaac L. Chuang, I came across this paragraph on quantum teleportation,
Intuitively, things look pretty bad for ...
2
votes
1answer
69 views
The Methodology of Quantum Key Distributions Systems
While reading an answer in Cryptography.SE I saw this
As for security, that's one possible way to perform Quantum Key Distribution, another real thing. However, most current QKD systems sold today do ...
1
vote
1answer
49 views
Post-selection applied to quantum teleportation
In this answer, it is stated that applying post-selection to quantum teleportation results in Alice communicating to Bob backwards in time. Could someone explain how this works?
I am particularly ...
2
votes
2answers
63 views
How does Bell measurement work in the teleportation?
I'm a complete beginner and one of the first things I was taught was the teleportation protocol. In the protocol, the party sending its state (which we call say $|\phi\rangle$) makes a Bell ...
5
votes
3answers
198 views
Is communication possible with entanglement?
From what I gather, communication is not possible with quantum mechanics. With the experiment on teleportation, entanglement is referred to as coordination and not communication. However, my belief is ...
1
vote
1answer
28 views
In quantum teleportation what is the need for the extra X/Z gate after classical information is sent from Alice to Bob?
In the Qiskit textbook, at step 4, Bob who has received the classical bits from Alice then needs to apply a X and/or Z gate depending on what the classical bits received are, why is that?
2
votes
1answer
144 views
Transferring GHZ state onto some qubits
This question is just my effort that I made by understanding the previous answers to my questions . I have a GHZ state $|000\rangle+|111\rangle$ (please ignore the normalizing constant). For ...
0
votes
2answers
93 views
Cluster/Graph state teleportation
I came across somewhere about the circuit diagram that depicts the teleportation of a 4-qubit cluster state. Here it is
Let me tell what i understood.
The qubits on the first two wires give the state ...
3
votes
1answer
41 views
How does quantum teleportation relate to quantum encryption?
I am in grade 11 and am trying to work on a project, but I find this question a little confusing. I am trying to talk about the implications of quantum teleportation, specifically quantum encryption ...
3
votes
1answer
61 views
Rearrangement of qubits in Quantum Teleportation Protocol
I have been reading Quantum Teleportation (Pg. 27) from Nielsen and Chuang and noticed that after the Hadamard operation, the state obtained was re-written by regrouping the terms to obtain the ...
0
votes
0answers
39 views
How should I understand that protocol has worked correctly by histogram?
I'm trying to simulate quantum secret sharing protocol HBB99 I've read the paper "Quantum secret sharing" by Hillery, Bužek and Berthiaume (Phys. Rev. A, 1999; preprint on arXiv) and I have a question ...
2
votes
2answers
151 views
In Qiskit quantum teleportation protocol, why they use CZ and CX gate at the end?
I understand the simple quantum teleportation protocol and why it uses X and Z gate at the end of the circuit.
I was researching about the Qiskit and I came across this video
https://www.youtube....
2
votes
2answers
128 views
Why canāt I use quantum teleportation to transmit data FTL 1/4 of the time?
$\newcommand{\bra}[1]{\left<#1\right|}\newcommand{\ket}[1]{\left|#1\right>}\newcommand{\bk}[2]{\left<#1\middle|#2\right>}\newcommand{\bke}[3]{\left<#1\middle|#2\middle|#3\right>}$
...
2
votes
0answers
69 views
How does Teleportation based Error Correction (TEC) detect and correct loss/erasure errors?
I'm looking at papers like Demonstration of teleportation-based error correction in the IBM quantum computer (page) 10 and Role of syndrome information on a one-way quantum repeater using ...
4
votes
1answer
41 views
What does it look like to split an EPR pair?
I am reading Quantum Computation and Quantum Information by Michael A. Nielsen & Isaac L. Chuang, and I am confused about a concept presented in Section 1.3.7: Quantum Teleportation. The book ...
3
votes
1answer
85 views
Does principle of deffered measurement imply information can travel faster than light?
I have been reading the book by Michael A Nielsen and Isaac Chuang and came across the principle of deferred measurement. They showed using this principle how the circuit for quantum teleportation can ...
1
vote
2answers
244 views
Entanglement Swapping Circuit
I implemented 2 versions of the entanglement swapping circuit in IBM Q. One is using classical measurement to control X, Z gates. Another is just us C-NOT and Controlled-Z. They should be equivalent. ...
3
votes
1answer
114 views
How does the teleportation circuit work after the initial entanglement?
I'm trying to understand why we do what we do when we teleport a state from Alice's first qubit to Bob's qubit. I understand the initial entanglement, but could use help walking through the program.
...
2
votes
2answers
156 views
How to implement controlled gate based on measurement (quantum teleportation)?
I am implementing the teleportation algorithm on IBM Q Experience (GUI interface). Certain operations on the third qubit are only performed if the classical measurement result is 1, for example
...
4
votes
1answer
132 views
Generalising the standard quantum teleportation protocol: what are the possible unitaries?
Consider the standard quantum teleportation scheme. Let the first register hold the state $\newcommand{\ket}[1]{|#1\rangle}\ket\psi$ to be teleported, and the second register be the one shared between ...
2
votes
0answers
36 views
Teleportation and non-orthogonal measurement operators
Consider the simple state teleportation gadget below. Measuring the entangled state after the CZ gate in the $X$ eigenbasis (equivalent to first applying $H$ and then measuring in computational basis) ...
4
votes
1answer
229 views
Compute the output of the quantum teleportation circuit
Sender and receiver use the teleportation protocol, where the sender teleports a quantum state $\left| \varphi \right>=\alpha\left| 0 \right> + \beta \left|1\right>$ to the receiver.
I want ...
2
votes
1answer
69 views
Quantum teleportation between two computer chips, how relevant?
After stumbling upon this recent news article: Information teleported between two computer chips for the first time (which references a "Nature Physics" publication Chip-to-chip quantum teleportation ...
3
votes
2answers
131 views
Problem involving entanglement swapping
I'm trying to solve a problem. I have my own approach to it, as the one in the textbook seems overly complicated. I tried using my own approach, but I'm not sure if what I found was a coincidence or ...
2
votes
1answer
95 views
Is it possible to write a Q# teleportation code which returns a qubit?
Is it possible to write a Q# teleportation code which returns a qubit?
Thanks.
9
votes
1answer
179 views
Is quantum teleportation a natural phenomenon?
Quantum teleportation is a reasonably well-defined physical process, whereby a quantum state is transferred between two separated entities that already share an entangled state. It's been demonstrated ...
5
votes
1answer
500 views
Understanding quantum teleportation algorithm from qiskit tutorials
I am very new to quantum computing and I have recently started to experiment with qiskit module in python, by following tutorials and implementing simple algorithms....
-1
votes
2answers
100 views
Does this setup violate relativity?
Suppose Alice needs to transmit a bit of information about something which happened just before $t = 0$ to Bob who is light years away from Alice. Entangled pairs of qubits, $\left|00\right> + \...
1
vote
0answers
26 views
Entanglement and teleportation in quantum annealing and parallel computation
In classical optimization problems, some objective function's surface serves as a landscape for finding its minimum through minimization algorithms.
Instead of your typical U-shaped objective ...
5
votes
2answers
856 views
Trying to build a circuit for quantum teleportation on IBMQ I get ERROR_RUNNING_JOB error
I am trying to build a circuit for quantum teleportation. On the simulator, everything runs fine and according to expectations, however, I am not able to run the algorithm on the real quantum ...
3
votes
0answers
50 views
Understanding shared Bell states from quantum entanglement
I'm trying to understand an entanglement swapping derivation provided in this PDF (pages 2 - 3)
I have several things about this process that I don't understand, and I was hoping someone could ...
0
votes
1answer
107 views
Evaluate the following teleportation equation for $U = ZX$ and $a = 0, b = 0$
When I evaluate the following equation using $U = ZX$ and $a = 0, b = 0$ [for Bell state], I am getting LHS not equal to RHS.
Before describing the protocol, let us first review the teleportation ...
-1
votes
1answer
65 views
What is the resultant composite quantum state after the transfer?
Suppose Alice has the following state
$|\Psi\rangle = \frac{1}{\sqrt2} (|10\rangle + |11\rangle)$
If Alice transfers 1st qubit to Bob then is this the resultant composite system state after transfer?
...
2
votes
1answer
100 views
Explain matrix multiplication math operations of a Hadamard gate after a phase gate
Starting with $|0\rangle$, I would like to understand how the probability values of 85.4% $|0\rangle$ and 14.6% $|1\rangle$ are derived from the payload circuit below?
After applying the 45 degree ...
5
votes
3answers
146 views
In what ways can qubits be used for applications that do not require entanglement?
Many good questions on this site have explored how entanglement lies at the boundary between the quantum world and the classical. For example in computational speedups, or teleportation or superdense ...
6
votes
1answer
99 views
How to understand a phase operation between 2 Hadamard gates?
I would like to understand this image, of a "payload preparation" gate. A single H gate will create a superposition, while the phase will rotate 45 degrees. What does the second H gate do in this ...
1
vote
1answer
111 views
How to integrate Simulaqron on ProjectQ
I am trying to simulate quantum teleportation on ProjectQ using simulaqron (enabling me to use quantum internet for teleportation) however I am not sure if my approach is right. In the working paper ...
4
votes
1answer
138 views
Quantum gate teleportation T gate
I am faced with the problem of teleporting certain gates using modified Bell states. For example, I have solved the problem with the $S$ gate, which is defined as following:
Alice and Bob share a ...