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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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I can't install Quantum Espresso in MacOS High Sierra

I have problems while executing ./configure. I am quite new with these things and I don't really know where the problem is. In configure.log file I get the following errors (I couldn't upload it because it was too heavy): gfortran: error:…
Ainhoa Oliden Sánchez
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using third part modules in IBM quantum experience (Tensorflow)

Is there any option to use Tensorflow in IBM quantum experience? I have searched on google but I couldn't find anything. I thought about copying the source code, any suggestion?
Raúl París Murillo
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Timeout when trying to install Qiskit on macOS

I am trying to install Qiskit 0.20.0 on my machine running macOS and seeing the below error pip install qiskit Collecting qiskit Using cached qiskit-0.20.0.tar.gz (4.0 kB) Collecting qiskit-terra==0.15.1 Downloading…
Vidyasagar Machupalli
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Are random numbers generated using a quantum integer as its seed considered pseudo-random or truly random?

I always hear that random numbers produced by quantum computers are considered "truly random" while random numbers generated from a classical computer are considered "pseudo-random". If one were to generate random numbers using a quantum integer as…
Cody
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Qiskit Portfolio Optimization Application

I recently got flung into the world of quantum computing and I'm a beginner at coding. I was assigned to do the Portfolio Optimization tutorial of the Qiskit Finance Tutorials and input real data. Truth be told, I'm clueless. It's my understanding…
Lana
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From DFT to QFT python/qiskit

I have the following code x = [1, -4, 5, -2] # Data points N = len(x) # Number of samples n = np.arange(N) # Current sample k = n.reshape((N, 1)) # Current frequency e = np.exp(-2j * np.pi * k * n / N) # Exponential part DFT = np.dot(e, x) How…
Steve Bermeo
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Qiskit quantum fourier transform

We have 4 numbers x = [x1, x2, x3, x4] We want to prepare quantum state Psi somehow to encode x We want to make QFT on Psi to get Phi = QFT (Psi) I have no idea how to approach this on qiskit
Steve Bermeo
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How does one code a number x into a quantum state?

We have 4 numbers x = [x1, x2, x3, x4] We want to prepare quantum state Psi somehow to encode x We want to make QFT on Psi to get Phi = QFT (Psi)
Steve Bermeo
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Find closest matching array element and group them

I would like to use qunatum computing for the below problem statement There are list of arrays upto n a1= [a,b,c,d,e] a2= [a,b,d,e] a3= [a,e] a4=[a,e] a5=[a,b,c,d,e] The output should give the maximum common grouping items like, for a1 and a5 both…
Luther
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Tensorflow Quantum: PQC not optimizing

I have followed the tutorial available at: https://www.tensorflow.org/quantum/tutorials/mnist. I have modified this tutorial to the simplest example I could think of: an input set in which x increases linearly from 0 to 1 and y = x < 0.3. I then use…
Thomas Hubregtsen
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Difference between R1 and Rz in Q#

As far as I know, both Rz and R1 operations in Q# rotate a qubit about the z-axis. In Q# API reference (https://learn.microsoft.com/en-us/qsharp) I found out that the only difference between them is that R1 also applies rotation about the "PauliI"…
old tankist
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Cannot create Q# Quantum Application in Visual Studio

I'm going to create Q# application for the first time. I installed the "Microsoft Quantum Development Kit" and I have .not core 3.1.301 (the latest) I use VS 2019 Community Edition. In VS, I see the Q# Application when creating new solution but when…
FLICKER
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Difference between density matrix and completeness relation

The expression for completeness relation in quantum mechanics is - Σ |ψ_n><ψ_n| = 1 where the expression for density matrix in statistical mechanics is - ρ = Σ p_n |ψ_n><ψ_n| Both of the equation looks the same. So what are the differences…
Mahbub Rahaman
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In quantum computing is there a preference to usage of little endian or big endian?

I've been learning quantum computing related concepts over the past few months. We've generally used the big endian notation while solving problems on paper. Recently on starting to code I find that at a lot of places the little endian notation is…
Akash sharma
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IBMQProvider issue

I successfully installed and ran a couple of circuits on a backend the other day (essex). Everything was ok, results came up, but the next day, once I wanted more QC, I could not manage to get a provider. I have looked into my account (active),…
Ruben Alfonso Casillas Pacheco
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