Quantum Computing Stack Exchange is a question and answer site for engineers, scientists, programmers, and computing professionals interested in quantum computing. It only takes a minute to sign up.

Sign up to join this community
Anybody can ask a question
Anybody can answer
The best answers are voted up and rise to the top

Top Questions

2 votes
2 answers
36 views

Classical Information Theory vs. Quantum Information Theory

1 vote
0 answers
34 views

Doesn't a beamsplitter contradict the nocloning theorem?

0 votes
1 answer
33 views

How to determine with local measurements which Bell state we have?

0 votes
1 answer
15 views

Understanding Paddle Quantum's MBQC simulation

0 votes
0 answers
12 views

qiskit: convert from ising result to qubo result?

0 votes
1 answer
57 views

What is the difference between $|\Phi^+\rangle=\frac1{\sqrt2}(|0,0\rangle+|1,1\rangle)$ and a mixture of $|00\rangle$ and $|11\rangle$?

0 votes
1 answer
38 views

Can Quantum Computers (not simulators) solve a 4 node TSP?

1 vote
3 answers
44 views

What are the differences in using qasm, statevector, and unitary simulators in qiskit?

1 vote
0 answers
14 views

Does QSVT/QSP require singular/eigen decomposition?

1 vote
0 answers
19 views

Is there a general parametric transformation matrix form in bloch-space corresponding to the unitary operations on qutrits?

8 votes
0 answers
50 views

Why was Feynman hesitant about simulating fermions with a quantum computer?

1 vote
1 answer
58 views
+200

What is the conditional min-entropy for diagonal ("classical") matrices?

2 votes
1 answer
58 views

What are the practical advantages of quantum GANs with respect to classical ones?

2 votes
1 answer
42 views

I am having problem in executing measurement based quantum computing circuit

3 votes
0 answers
28 views

Specific relation between the classical Fourier transform for finite abelian groups and the QFT for finite abelian groups

4 votes
1 answer
42 views

Is Density Matrix simulation same as Tensor Network simulation?

0 votes
0 answers
27 views

My IBM quantum account has been disabled for no apparent reason [closed]

0 votes
0 answers
38 views

Is there a proportionality how the number of quantum error corrections increases with the number of qubits? [closed]

0 votes
0 answers
22 views

Why can't one use the phase kickback if the function is not binary?

1 vote
1 answer
145 views

how to prove quantum teleportation can't be achieved by sending only one classical bit

2 votes
0 answers
14 views

Simulation of non hermitian operators with Qiskit

2 votes
0 answers
22 views

Efficient quantum algorithms to decompose Hessian matrices into sums of unitaries

2 votes
1 answer
52 views

Confusion in Aaronson's CHP Paper

0 votes
0 answers
49 views

Error: cannot import name 'BaseBackend' from 'qiskit.providers'

0 votes
0 answers
21 views

How to understand Tensor observables and Combined measurements from the perspective of quantum mechanics?

1 vote
0 answers
23 views

ZX-calculus: Commutation rules for ZH gate

0 votes
1 answer
50 views

How can orthonormal vectors satisfy $\langle i|j\rangle=\delta_{ij}$?

3 votes
0 answers
30 views

How is the surface of a Bloch sphere a Hilbert space?

1 vote
1 answer
18 views

Where are the multi-qubit openpulse computers?

2 votes
0 answers
30 views

No clonning states that one cannot clone any arbitrary given state. But can we have a device that can create same superposition state repetatively?

4 votes
2 answers
167 views

What are the transversal gates of Shor's [[9,1,3]] code?

1 vote
0 answers
84 views
+50

PyZX optimisation steps for Clifford circuits

6 votes
3 answers
306 views

Finite subgroup of $U(4)$ containing a non-Clifford gate and all local Cliffords

1 vote
0 answers
18 views

why Hamiltonian can be expressed by sum of outer product in two level systems?

0 votes
2 answers
25 views

Where can I find runtime of ibm quantum gates?

0 votes
3 answers
45 views

AWS braket python sdk: user is not authorized to perform on quantum device

1 vote
1 answer
36 views

Is this Quantum Neural Network overfitting?

0 votes
1 answer
31 views

How to get a corresponding unitary matrix from a tableau in stim?

1 vote
1 answer
36 views

Equivalence between quantum circuit: CNOT changes control and target qubit

2 votes
1 answer
35 views

Why does qutip run without errors, but cannot output a Bloch sphere graph?

1 vote
0 answers
88 views

Bell test results question

0 votes
0 answers
28 views

Accuracy of Classical Counting problem

1 vote
1 answer
51 views

training parametric circuits in Qiskit

1 vote
0 answers
25 views

QuTiP lecture: Single-Atom-Lasing

0 votes
0 answers
21 views

Get qiskit-native gates from a circuit containing custom gates

1 vote
1 answer
35 views

The relationship between number of shots and performance of quantum agent

-3 votes
0 answers
16 views

Can you tell the next set of number [closed]

3 votes
2 answers
64 views

When we say that 4 qubits can represent $2^4$ binary bit sequences, how do we iterate to the desired bit sequence?


Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.