Questions tagged [quantum-circuit]

a model in which a computation is a sequence of quantum gates, which are reversible transformations on an n-qubit register (the quantum-mechanical analog of an n-bit register)

24 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
4
votes
1answer
61 views

What is the shortest-circuit-depth quantum-benchmarking algorithm?

An algorithm implementing a model whose results are known, and from the known results, the benchmarking of the device could be done. What is the currently known shortest circuit depth algorithm that ...
3
votes
0answers
21 views

How to design a RF-SQUID qubit by Qiskit Metal?

I am now learning how to use Qiskit Metal to design superconducting circuits. I found that there are only several transmon qubits in the library. Can I design an RF-SQUID qubit by using Qiskit metal? ...
3
votes
0answers
40 views

Writing circuits in Qiskit using only Clifford and T gates

Is there a way in Qiskit to write my circuit using only Clifford and T gates (CX, S, H, T and I think also $S^\dagger$ and $T^\dagger$)? With the function compile (with aer simulator) it gives me some ...
3
votes
0answers
42 views

How to efficiently construct quantum circuits of oracles in multi-target quantum search?

In standard Grover's quantum search with only one target or its extension of multi-target quantum search, one of the two key parts is to quantize the boolean function $$f(x):\{0,1,\cdots,N-1\}\...
3
votes
1answer
51 views

Block encoding technique: what is it and what is it used for?

I was wondering if someone could explain to me what this technique called "block encoding" does, and what it is used for at a high level, found in arXiv:1806.01838. It is in section 4.1, ...
3
votes
0answers
43 views

Feynman method and polynomial time algorithm for XQUATH

Consider the Feynman algorithm for simulating quantum circuits, as given here. Consider the XQUATH conjecture for random quantum circuits from here, given by (XQUATH, or Linear Cross-Entropy Quantum ...
3
votes
0answers
41 views

Query complexity on Quantum Pattern Matching of Mateus Algorithm

I am trying to understand the complexity of the Mateus and Omar algorithm for quantum pattern matching, it is clear to me from the pseudocode that the query complexity is $O(\sqrt{N})$, apart from the ...
3
votes
0answers
53 views

What are some standard ways to visualize non-unitary processes

In quantum computing, quantum circuits are a common model for visualizing unitary evolution. If I want to represent a unitary $U$ acting on a $2$-qubit state $|00\rangle$ followed by a measurement in ...
2
votes
0answers
88 views

Is there an efficient quantum circuit that create a random permuntation matrix?

Suppose we want to generate a random, random according to some probability distribution, unitary permutation matrix that is applied to an input of $n$ qubits. So is there an efficient polynomial time ...
2
votes
0answers
35 views

Marginal output probability of first bit for constant-depth circuits

Consider a constant depth $1\text{D}$ quantum circuit, which is applied to the input state $|0^{n}\rangle$, and whose output is measured in the standard basis. You can assume that the gates of the ...
2
votes
0answers
55 views

translating between measurement based and circuit based quantum computation

I think I understand circuit based QC (CBQC) well enough; I know very little about MBQC. From what I read it seems that they are somehow "equivalent". I'd like to check this with a concrete ...
2
votes
0answers
73 views

Iterative Phase Estimation with noise vs standard Quantum Phase Estimation with noise

I am doing Qiskit Lab 4 about Iterative Phase Estimation. I created a circuit implementing IPE for theta = 1/3 (phase of 2pi/3). Here's the circuit: It seems to do okay if I run it without noise in a ...
1
vote
0answers
45 views
+100

Working with higher energy states in Qiskit Experiments

I'm looking at the source code for the Qiskit Experiments module and see that the EFRabi class subclasses the Rabi class with the intent of calibrating rotations between the 1 and 2 states instead of ...
1
vote
0answers
64 views

Quantum Circuits for Time-Series Data

I am currently working with a dataset with autocorrelated features, i.e, x(t) affects the value of x(t+1) which affects the value of x(t+2). Suppose this is the circuit representing x(t): Does ...
1
vote
0answers
50 views

Applying a projector or a general nonunitary gate in the middle of a circuit using qiskit

Is there a way to implement a projector gate in a middle of a circuit?. For instance, assuming I have a Bell state $|00\rangle+|11\rangle$, I'd like to apply a projector on the first qubit onto state $...
1
vote
0answers
74 views

Circuit state preparation using amplitude encoding

I am following an example of preparing an input state using amplitude encoding from this book. How to calculate $\beta_1^1$ using given formula above? In my understanding, $\beta_1^1 = 2\arcsin(\frac{\...
1
vote
0answers
63 views

How to divide one quantum circuit into multiple sub-circuits in qiskit?

While I'm simulating one Big quantum circuit in Qiskit, I wonder how we can divide one big quantum circuit into several sub-circuits. I looked in Qiskit API documents, but I couldn't find it. Is there ...
1
vote
0answers
54 views

3-qubit phase shift gate/circuit implementation without any Ancilla qubits

Hi, I need help me with figuring out the 3-qubit phase shift circuit without any ancillas similar to the 2-qubit circuit shown in below attached picture....... Please do let me know! Thanks in advance!...
0
votes
1answer
51 views

How to create a quantum circuit to implement the same operations but acting on different qubits?

I want the draw the quantum circuit of the following Hamiltonian: $$H = - 4 \times X\otimes X\otimes X\otimes X - 4\times Z\otimes Z\otimes Z \otimes Z$$. I have been able to draw the circuits of $ - ...
0
votes
0answers
53 views

Simon's Algorithm - Equivalent Oracles Giving Different Results

In Simon's algorithm, is it possible to have two different oracles that return the same results on their own but cause Simon's algorithm to return different results from one another? In what sort of ...
0
votes
0answers
47 views

Method to mark only when certain conditions are satisfied in the superposition states of qubits

I am Newbie in Quantum Computing World. While studying on my own, I was curious about one thing, so I asked this question. My question is as follows: When I configure the superposition states of ...
0
votes
0answers
36 views

How to use 'RevLib' files in python?

RevLib is an online resource for benchmarks within the domain of reversible and quantum circuit design. It provides a database of functions with respective circuit realizations given in a appropriate ...
0
votes
0answers
52 views

Random Circuit Generation in Cirq

I am trying to improve an optimization method as describe in this paper: enter link description here For that I need to create many random equivalent circuits. In my experiment I have 6 beam splitters ...
0
votes
1answer
38 views

Symmetric Universal Quantum Cloning Machine (UQCM) N --> M for unknown states

Does it exist a schematic diagram of the quantum circuit implementing the symmetric UQCM N--> M for unknown states? If yes, does anyone know a Qiskit implementation of it?