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Questions tagged [quantum-computing]

Quantum Computation deals with considering computation as fundamentally physical, as well as replacing the classical binary digit (bit) with the quantum binary digit (qubit). While the classical bit is either 0 or 1, the qubit can be in a superposition of these states. Computation systems that use quantum phenomena, such as superposition and entanglement, can solve certain complex problems very quickly.

Related Links

Quantum Computing on Wikipedia

(Textbook) Quantum Computation and Quantum Information: The de-facto standard textbook for learning about quantum computing.

(Video Series) Quantum computing for the determined: Khan-academy-style videos explaining quantum computation, by Michael Nielson (co-author of Quantum Computation and Quantum Information).

Quantum Computing Q&A site on the Stack Exchange network.

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Is quantum assignment possible?

I once was talking to my programming teacher about quantum computers, and I remember him telling me that one limitation of these kind of machines would be that you can't actually do something like x = y. I was wondering why is quantum assignment…
JAZak
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A quantum algorithm with high probability on a 4 to 1 function

Let f : {0, 1}ⁿ → {0, 1}ⁿ be a 4-to-1 function, such that there exist distinct and non-zero a, b ∈ {0, 1}ⁿ such that for all x ∈ {0, 1}ⁿ: f(x) = f(x ⊕ a) = f(x ⊕ b) = f(x ⊕ a ⊕ b). Note that ⊕ is a bit-wise xor, and that for all y ∉ {x, x ⊕ a, x ⊕…
Rachel Bernouli
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Haskell "Could not find module ---" Quipper

I am extremely new to haskell and I have been searching all over the web but I haven't been able to solve my problem. I downloaded the Quipper package but I have not been able to get haskell to recognize where all of the modules and files are and…
user2650129
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How can I make a two qubit "controlled rotate" in QCL

I am trying to create a program in QCL (Quantum Computer Language) which randomly generates 1 of 6 states (i.e. a die rolling program). While implementing this, I found myself needing to write a function as follows: operator CondRot(qureg r, qureg…
Alex Nichol
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448-bit Blowfish, considering the 64-bit blocksize, is it secure at all for large files/volumes? (Crashplan)

Ok. So I recently signed up for Crashplan which uses 448-bit Blowfish to encrypt the data you send them, and the more I do research on Blowfish the more it sounds like the 64-bit block size is totally insufficient for the size of the volumes they…
user2467342
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Pennylane CVNeuralNetwork class not working

I am referring to the tutorial of CV-QNN in Pennylane(Strawberry Fields). Each layer of CV-QNN can perform the operation below. [![enter image description here][2]][2] Unlike other quantum neural network tutorials, where the input X and y are given…
user48217
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AWS braket python sdk: user is not authorized to perform on quantum device

I have installed boto3, aws cli, and python-braket-sdk. I have run aws configure, and config with my IAM user. My IAM user isn't root user, but it has AdministratorAccess, AmazonBraketFullAccess, AmazonBraketJobsExecutionPolicy policies. But if I…
voxter
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Generate 3 qubit W state using standard quantum gates

Starting from the state |000>, how can I generate the state (|100> + |010> + |001>)/sqrt(3) using only X,Y,Z,H,S,T,SWAP,TOFFOLI, rotation gates, QFT, and their controlled versions and any number of ancilla bits?
Govind Nair
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Why python doesn't see the members of quantumCircuit class qiskit

I`m trying to learn the programming on quantum computers. I have installed qiskit in VS Code (all qiskit extentions available in VS Code market) , python compilator (from Vs Code market "Python" and "Python for VSCode"). I have set up my qikit API…
v0rt3x
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The trace of square matrix?

if A is nxn matrix of some basis |b>. How we can show that the trace of A is actually the sum of the diagonal elements? I want to understand why Aii = < i |A| i >. I know unitary matrix can transform basis to another like U|b> = |b'>. can this…
J. Narrt
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Microsoft quantum Development Kit with another PC

I think that quantum teleportation can be realized by the Microsoft Quantum Development Kit, but by placing one piece of data (name A) on a PC not connected to the Internet and acting on one side (name B) Is it possible to react experimentally? In…
GotohRyo
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Converting from IPython notebook to an executable procedural Python module

I am trying to convert the IPython notebook for the official QuTip example of Adiabatic quantum computing into a standalone procedural Python module. Unfortunately, I am getting the following error while using the callback function process_rho.…
Omar Shehab
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Can we break RSA/AES encrypted document using quantum algorithms? If yes, How can we do it?

RSA and AES-256 are defined standards for encrypting "Top Secret" documents. Is it possible to attack using quantum algorithms like shor's and grover's?
Shreyansh prajapati
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Quantum walk on 3D grid

I am trying to apply the quantum coin walk on a 3D grid, with 3 Hadamard coins. However I can't seem to get symmetric results after 3 steps. Is it simply not possible to have a probability distribution which is symmetric with such a coin? Thank…
Trieu Jo
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Quantum computing vs traditional base10 systems

This may show my naiveté but it is my understanding that quantum computing's obstacle is stabilizing the qbits. I also understand that standard computers use binary (on/off); but it seems like it may be easier with today's tech to read electric…
Omar
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