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Questions tagged [q#]

Q# is a domain-specific programming language used to express quantum algorithms. This tag should be used for questions related to creating/programming quantum algorithms using the 'Q#' language. If the question is unrelated to, or arising from some non-quantum aspect of Q#, it might be better to ask on StackOverflow. If appropriate, also use the [programming] tag.

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1 answer
27 views

Strange non-normal distribution histogram when applying Hadamard gate in a loop

Recently I have explored Q# quantum programming language. My basic test was this,- for 10000 times in a loop reset qubit to ...
1 vote
1 answer
71 views

How to create an arbitrary state for debugging purposes in the local computer?

Is there a way to create an arbitrary state in Q# just for debugging purposes in the local computer via the quantum full state simulator?
1 vote
1 answer
50 views

How can I get the source code of “RUS” and “PQF”

Currently, I’m studying these two papers: “Efficient Synthesis of Universal Repeat-Until-Success Circuits” and “Efficient synthesis of probabilistic quantum circuits with fallback”. I want the source ...
1 vote
1 answer
33 views

Microsoft Classic QDK simulator

Is it possible to change the simulator used by the Classic QDK with Python simulation ? It's reported that Classic QDK supports several simulators (sparse, full-state...). Which one is used when ...
2 votes
1 answer
152 views

Is there a way to implement Smolin's variant of Shor's algorithm?

I'm currently investigating Shor's algorithm and especially Smolin's variant, that he described in his article: https://arxiv.org/abs/1301.7007 My applied changes according to Smolin's variant are ...
1 vote
1 answer
24 views

Is there a way to measure a time spent for simulation? Does Q# support something like this?

I want to measure the time spent for simulation of different algorithms to make some assumption about their efficiency. I use Microsoft Azure Quantum SDK and VS Code setup.
1 vote
1 answer
70 views

How write a marking oracle if greater than with Q#?

I'm trying to write a code to find a minimum in a list. I follow this paper : A quantum algorithm for finding the minimum. So I need to write an operator to mark the case $T [j] < T[y]$. My idea is ...
5 votes
2 answers
154 views

How do I produce circuit diagrams from a Q# program?

If I implement an adder operation in Q#, I'd like to see a quantum circuit diagram of what that adder is doing in order to check that it looks right. Is there a built-in way to do this?
1 vote
1 answer
59 views

Q#: how to write an algorithm in modular form (I don't understand the syntax and the documentation is a bit obscure)

I would like to make a resource estimate based on Azure resource estimator. However, the circuits I am interested in depend on some classical parameters: for this reason, I would like to make a ...
1 vote
1 answer
24 views

Applying Hadamard on inexistent qubit doesn't make Q# compilation fail: why?

This question is perhaps a bit unusual as I am not complaining that my code doesn't compile but rather that it compiles ;) Consider the following code: ...
1 vote
1 answer
32 views

Understanding command Ignore in Q#

Consider the following code on which I want to run the resource estimator: ...
4 votes
1 answer
405 views

Installing Q# in jupyter

I have followed all steps described in https://docs.microsoft.com/en-us/quantum/install-guide/qjupyter But I am unable to get through part 3. It is showing syntax error in Python terminal in Jupyter ...
0 votes
1 answer
46 views

Displaying the circuit diagram associated to a circuit in Q#+Python

I am learning the Q# language, and my script is in Python (I am using the online Azure interface). I created an example quantum circuit on three qubits: ...
1 vote
1 answer
33 views

DumpRegister sometimes blank?

I'm just getting into the baffling world of Quantum Computing so forgive me if this is straightforward... I'm using Microsoft's Q# simulator so I know I'm allowed to peek into the internals of a Qubit ...
0 votes
0 answers
76 views

VSCode: System.DllNotFoundException when running Q# project

I am trying to set up my Q# environment in VSCode, yet I keep getting an error when running the boilerplate code. I have followed the instruction found here. The error I am getting is the following: <...
0 votes
1 answer
74 views

Cannot import namespace from a Q# file to run it in a python script

I'm trying to run a Q# skript from python host. To do so I've installed qsharp package for python and followed all instructions as described under following link: https://learn.microsoft.com/de-de/...
1 vote
1 answer
59 views

Changing target Quantinuum Processor

I am trying to go through the Q# tutorial at https://learn.microsoft.com/en-us/training/modules/qsharp-create-first-quantum-development-kit/4-random-number-generator before I get my hands dirty and ...
0 votes
0 answers
58 views

My First Own Grover Search with Q#

After I read the "[Quantum computing foundations](https://learn.microsoft.com/en-us/training/paths/quantum-computing-fundamentals/) of Microsoft I would like to be sure I understand a little the ...
12 votes
3 answers
4k views

Big Endian vs. Little Endian in Qiskit

I've noticed that Q# favors Little Endian. Meaning that most operations are designed for this type of encoding. Is is it the same with Qiskit?
-1 votes
1 answer
274 views

Error running Q# notebooks: Syntax does not match any known patterns

C:/snippet_.qs(1,85): error QS3001: Syntax does not match any known patterns. C:/snippet_.qs(1,26): error QS6104: No namespace with the name "Microsoft.Quantum.Intrinsic" exists. C:/snippet_.qs(7,17): ...
0 votes
1 answer
174 views

What is the data type "Unit is Adj" in Q#?

I came across it as the return type of operations in this paper: https://arxiv.org/abs/2204.13835. It is also used in various places in the Q# documentation.
0 votes
1 answer
144 views

VS Code/Q#: No namespace with the name "Microsoft.Quantum.Canon" exists [closed]

I am running the current latest version of Visual Studio Code on POP_OS (Ubuntu 22.04 LTS) and have installed all requirements to get Q# running on my machine: I have installed the SDK following ...
0 votes
1 answer
56 views

Is there any paper about the encoding process in the machine learning API?

I want to know more details about the encoding process in machine learning. I have read the source code about the "ApproximateInputEncoder" method. It seems like a complex method. So is ...
1 vote
1 answer
128 views

Accessing tuple data in Q#

I am continuing my work on the SAT katas, but I thing I am missing something on the way the tuple data type works. In this example code, I am trying to access the data in a tuple type : ...
0 votes
0 answers
83 views

Q# Grover Tutorial Problem

Referring to the Q# tutorial on Grover algorithm in https://docs.microsoft.com/en-us/azure/quantum/tutorial-qdk-grovers-search?tabs=tabid-visualstudio, I replicated the code exactly in Visual Studio ...
1 vote
1 answer
156 views

Correctly configuring a Q# test project in Visual Studio Code

I have some Q# code which I'm editing using visual studio code. The codebase is divided into a src/ folder and a test/ folder. ...
9 votes
1 answer
1k views

Ground state energy estimation - VQE vs. Ising vs. Trotter–Suzuki

Disclaimer: I am a software engineer who is curious about quantum computing. Although I understand some basic concepts, theory and math behind it, I am by no means experienced in this domain. I am ...
3 votes
3 answers
460 views

Unit testing for quantum programs?

Does unit testing on real quantum computers make sense as any observation in the quantum system can cause the system to loose its superposition state?
1 vote
0 answers
64 views

What's meaning of the expression like "Qubit[] => Result"

In Q#,there are lots of expressions like "Qubit[] => Result". It can be the type of return result,like this: ...
0 votes
1 answer
32 views

How to caculate the resources used by an operation when the operation receives arguments?

I want to use Q# to evaluate the real resources of an operation, but some problems happen. I want to evaluate the resource of training model operation for the example of half-moons data classification....
0 votes
1 answer
25 views

Where can I find the package of "testing" when run the Linear Algebra exercise of QuantumKatas?

I want to run the Linear Algebra tutorial exercise of QuantumKatas in vscode. But the package of "testing" can't be found. The package of "qsharp" and "pytest" have been ...
1 vote
2 answers
139 views

How to caculate the inner product of two vectors with Q#

For example, if $a$ is a row vector, $b$ is a column vector, how to use Q# to calculate the inner product of these two? Which method or operator can be used? Just $a*b$? Any others? Really need your ...
1 vote
1 answer
40 views

Result and IQArray could not be found

I am following this MS tutorial to add functionality to my Q#/C#host project. However, I get two errors on my operations: ...
0 votes
1 answer
47 views

Q# Application Template available for VS2022? [closed]

Implemented Grover Search Tutorial using Q# in VS2019. Moved to Windows 11 and also installed VS2022. Project opens and runs OK in VS2022. However code has no intellisense and color. i.e. program.qs ...
1 vote
2 answers
151 views

Implementing the Oracle in Grover

I need your expert opinions/comments on this problem. Suppose I have a database (say 16 entries), such that db[0] = 0.12, db[1] = 0.84, db[2] = 0.55, ..., db[15] = 0.91. I want the oracle to mark ...
4 votes
1 answer
58 views

Missing types, namespaces, directives, and assembly references

I use VS Code for C# and Unity3D and TypeScript and <...
0 votes
1 answer
119 views

Q# install issue

I have followed the instructions to install Q# using conda as recommended, and given by MS. When I try to import qsharp from my virtual env within a Python program, ...
1 vote
1 answer
265 views

Q#/VS: No namespace with the name "Microsoft.Quantum.Canon" exists

I am trying to run a simple "Hello World" project in Q#, following this tutorial. I have completed the following steps (Step #s from tutorial link): Step 1: Installed the latest version of ...
1 vote
3 answers
2k views

Which quantum computing frame is suitable for optimization problems?

As in the computer world, not all programming languages are suitable for everything. Php = Backend Javascript = Frontend Data Analsys/ML = Python embedded systems = C Mobilphone/apps = Android / Swift ...
1 vote
1 answer
143 views

Braket and Q# Simulators

I have implemented Shor's algorithm in Qiskit, and everything works as expected within the IBM Q experience for both the IBM qasm_simulator and real hardware. However, after I've implemented Shors in ...
4 votes
1 answer
469 views

Is there a function in Qiskit to measure tensor products of Pauli operators?

Is there a function in Qiskit similar to this function in Q# which measures strings of Pauli operators applied to different qubits?
2 votes
1 answer
110 views

Hamming with prefix oracle

I'm doing the Q# quantum katas and I'm stuck on an oracle in the Deutsch-Jozsa algorithm katas. Let $|x\rangle=|x_0x_1\dots x_{n-1}\rangle$ be a qubit array and $r$ be bit string of $k\leq n$. The $k$...
2 votes
1 answer
142 views

Passing arrays to operations/functions in Q# Jupyter Notebooks

In order to pass inputs to Q# operations/functions with Jupyter Notebooks, one uses the magic command, %simulate, and writes out the inputs as key-value pairs, <...
6 votes
3 answers
107 views

Simulator-dependent implementations in Q#

I have a Q# operation: ...
1 vote
2 answers
125 views

Circuit to transform $|0\rangle$ into $\alpha|0\rangle + \beta|1\rangle$ for any $\alpha, \beta$

Hi I'm new to QC and doing some katas in Q#. I got stuck on this excercise and would appreciate help: Quantum circuit to get following state qubit: $\alpha|0\rangle + \beta|1\rangle$ when the input is ...
0 votes
1 answer
159 views

Things that I can compare between QDK and Qiskit

I am planning to write an article which compares QDK and Qiskit Mainly talking about the different interfaces, and difference in running few algorithms What all parameters should I compare and take ...
3 votes
1 answer
146 views

Quantum Katas - Tutorials - Oracles - Task 3.3 (OR oracle of all bits except for a single bit)

Let $x$ be an arbitrary state composed of $N$ qubits and $k$ be an integer such that $0\leq k \leq N.$ The task is to ignore the $k$-th bit and to flip the sign of $x$ if any of the remaining bits are ...
5 votes
2 answers
1k views

Measuring entanglement entropy using a stabilizer circuit simulator

I'm trying to simulate stabilizer circuits using the Clifford tableau formalism that lets you scale up to hundreds of qubits. What I want to do is find the entanglement entropy on by splitting my ...
0 votes
1 answer
64 views

Quantum Katas - Tutorials - SingleQubitGates - Exercise 7 - Preparing an arbitrary state

Exercise 7 "Preparing an arbitrary state" from the Quantum Katas - Tutorials - SingleQubitGates asks to prepare a state $\alpha|0\rangle + e^{i\theta}\beta|1\rangle$, using parameters $\...
1 vote
1 answer
206 views

How to use QFT operation in Q#?

I see the QFT operation in the document given by Microsoft, but I don't know how to call it. ...