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

Explore our Questions

Ask Question

more tags

Active 1 Bountied Hot Week Month

2

votes

0

answers

16

views

computing bijective function into register

quantum-state

modified 2 hours ago AHusain 3,353

8

votes

3

answers

497

views

Does the quantum Fourier transform have many applications beyond period finding?

shors-algorithm hhl-algorithm quantum-fourier-transform applications

modified 2 hours ago Mark S 4,074

0

votes

0

answers

14

views

Having a dataset of different values [0,1000], how to convert them to quantum data to train a model using Tensorflow Quantum

quantum-gate circuit-construction

modified 3 hours ago Martin Vesely 7,348

4

votes

0

answers

38

views

Average secret key rate calculation

information-theory key-distribution qkd

modified 6 hours ago glS 11.7k

4

votes

2

answers

338

views

How to use external .csv data file in quantum support vector machine qiskit python code?

algorithm qiskit programming

answered 6 hours ago Alexander Makalovij 11

3

votes

1

answer

107

views

Why is the superposition of all states an eigenvector, with eigenvalue 1, of the QFT?

shors-algorithm

modified 6 hours ago glS 11.7k

5

votes

3

answers

349

views

Why can I not apply a control gate/function to a gate like T, S, S dagger, … (using IBM Quantum Experience)? Is there another option?

quantum-gate ibm-q-experience quantum-fourier-transform quantum-circuit

modified 8 hours ago Davit Khachatryan 3,563

0

votes

1

answer

17

views

Error When Importing from qiskit.aqua

programming qiskit

answered 8 hours ago Adam Zalcman 1,911

2

votes

2

answers

32

views

How does the term $|\psi\rangle\langle\psi|$ come from while calculating the expectation value?

quantum-state partial-trace

answered 9 hours ago DaftWullie 35k

2

votes

1

answer

107

views

Application of QFT to Order-finding

textbook-and-exercises nielsen-and-chuang quantum-fourier-transform qft order-finding

modified 14 hours ago Adam Zalcman 1,911

5

votes

0

answers

83

views

+50

New Hybrid-HHL algorithm vs VQLS

algorithm hhl-algorithm machine-learning

modified 18 hours ago thespaceman 301

1

vote

2

answers

37

views

How do I trace out the second qubit to find the reduced density operator?

textbook-and-exercises partial-trace trace

answered 18 hours ago KAJ226 4,459

2

votes

1

answer

62

views

Vector from SU(2) to SO(3)?

quantum-state bloch-sphere

modified 18 hours ago Adam Zalcman 1,911

2

votes

0

answers

32

views

How to formally compute the probabilities in the BB84 protocol?

cryptography communication

asked yesterday Coconut 21

Browse more Questions

Quantum Computing Stack Exchange works best with JavaScript enabled