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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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
22 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
67 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 ...
3 votes
1 answer
221 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
26 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
62 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
52 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
98 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
893 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
332 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
54 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
20 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
24 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
56 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 ...
0 votes
1 answer
34 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
37 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
66 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
51 views

Missing types, namespaces, directives, and assembly references

I use VS Code for C# and Unity3D and TypeScript and <...
0 votes
1 answer
97 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
152 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
1k 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
111 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
386 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
88 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
74 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
104 views

Simulator-dependent implementations in Q#

I have a Q# operation: ...
1 vote
2 answers
108 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 ...
10 votes
2 answers
2k 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?
0 votes
1 answer
99 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
84 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 ...
4 votes
2 answers
412 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
42 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
110 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. ...
3 votes
1 answer
86 views

What all parameters can we take into account when comparing different quantum programming languages

I am planning to write a paper which compares Qiskit and Q# in the following circuits/algorithms Bell circuits Controlled swap to test similarity of two registers Phase kickback between two qubits ...
1 vote
1 answer
32 views

Q# Callable Not Accessible from Open Namespace

I am trying to to call ApplyMultiplyControlledAnd(), and I'm receiving an error saying "The callable ApplyMultiplyControlledAnd exists in an open namespace, ...
1 vote
1 answer
205 views

Take every second element of the array in Q#

Very quick question, I am trying to implement SAT solving in Q# using Grover's Algorithm. I want to take every second element from an array starting at the second element, represented with a range ...
5 votes
1 answer
108 views

Q# installation on Heroku

I'm trying to deploy a simple Quantum App written using Python on Heroku Server which is also using Microsoft's Q#, but getting the below error: ...
7 votes
1 answer
200 views

Q# Simulation Behavior

I am attempting to run a series of tests on a Q# program I'm running on the local simulator, but I'm not seeing any way to use >1 shot and collect the results of those shots at once, as in ...
4 votes
3 answers
193 views

Does Q# have a bigint type?

Shor's algorithm works with very large integers; larger than 64 bits. So the built-in 64-bit Int type is insufficient for doing the classical processing (e.g. ...
3 votes
2 answers
53 views

Creating a resource count unit test in Q#

I want to create a unit test in Q# that runs an operation and asserts that it used at most 10 Toffoli operations. How do I do this? For example, what changes do I have to make to the code below? ...
3 votes
2 answers
131 views

$S^{\dagger}$ gate in Q#

I would like to implement $S^{\dagger}$ gate in Q# and I would like the best way to do it, is it correct to say that $S^{\dagger}$ is equivalent to R1( -Pi()/2 , q) ...
2 votes
2 answers
467 views

Problems with Q# installing

I don't know if this is the right place to ask this question. I just thought it would be a place where people knew what they are doing. If there is a better place to look for answers (stackoverflow ...
4 votes
3 answers
4k views

Overview of Cirq, qiskit, q#, ibmq(circuit board), other [closed]

What is the difference between these frameworks or languages? What are the pros and cons of each of these? Do you know any similar framework/platform/language that gives some more advantages?
2 votes
1 answer
240 views

How to solve QUBO problems in Q#?

Short version: I'm trying to solve a traveling salesman problem very similar to the traveling Santa example here: http://quantumalgorithmzoo.org/traveling_santa/, which is also included in the samples ...
0 votes
2 answers
76 views

How to get circuit run time in Q#

What is the best way to get the circuit run time in Q# ? More precisely, I run a circuit using dotnet -run command and I would like to know how many time it took for running my circuit. Actually I ...
1 vote
1 answer
57 views

Best way to test the performance of a simulated quantum algorithm in Q#

for a student report about solving graph coloring with Grover's Algorithm, I have to talk about the performance of simulated Grover's Algorithm to solve graph coloring. I don't really know how to ...
0 votes
0 answers
140 views

Different result between Q# and Qiskit

I'm running a search program with custom initial state. I wrote a program in Q# and one in Qiskit but I get different results even if the code seems to be peforming the same operations. The Q# result ...
1 vote
1 answer
74 views

Grover algorithm in Q#

I have this program derived from Microsoft Quantum Kata for quantum search (Grover algorithm) (see here) ...
3 votes
1 answer
288 views

Implement U2 and U3 gate in Q#

I know that U1 equivalent gate of Qiskit in Q# is R1, but I would like to implement U2 and U3 gate of Qiskit in Q#, what is the best way ? Thank you.
0 votes
2 answers
75 views

Run circuit N times in Q#

I use dotnet run command to run my .qs quantum circuit. Is there a way to run my circuit N times, and get results of each run (like the shots parameter in Qiskit) ? Thank you.