Hottest Questions Today

0 votes

1 answer

11 views

If all terms of a local Hamiltonian commute, how hard is it to learn the ground state (energy)?

Yunzhe

190

answered 1 hour ago

0 votes

0 answers

11 views

How to 'quantize' a classical code?

Ash Ketchum

11

asked 2 hours ago

1 vote

1 answer

630 views

Why can't Grover's algorithm apparently solve this simple situation?

Mariia Mykhailova

8,755

answered 14 hours ago

1 vote

1 answer

20 views

Measuring one qubit in an entangled pair in another basis?

DaftWullie

55.8k

answered 8 hours ago

1 vote

1 answer

18 views

Is qiskit.pulse.SamplePulse deprecated?

Martin Vesely

13.6k

modified 9 hours ago

1 vote

0 answers

16 views

Access individual qubits of a quantum circuit in qiskit by qubit name

Ash Ketchum

11

asked yesterday

3 votes

1 answer

69 views

What is the difference between classical-quantum and completely classical states?

glS♦

23.4k

modified yesterday

3 votes

0 answers

35 views

A measure of entanglement created by a unitary operation

Martin Vesely

13.6k

modified yesterday

2 votes

1 answer

46 views

What does "lift" mean in the Lifted Product (LP) Code?

Pavel Panteleev

46

answered 10 hours ago

2 votes

1 answer

66 views

Finding the "dual" basis of an overcomplete basis for Quantum State Tomography

glS♦

23.4k

modified yesterday

0 votes

0 answers

13 views

What is the difference between shot and iteration of the quantum circuit?

JYLEE

9

modified yesterday

1 vote

0 answers

11 views

Accuracy of QPE using histogram fit

Ron Cohen

1,184

asked yesterday

1 vote

0 answers

23 views

Get confused about the implementation of Amplitude Amplifier

Alexis

183

asked yesterday

2 votes

1 answer

50 views

Why can't we do pure state tomography using interference with a known reference state?

Quantum Mechanic

3,659

answered yesterday

2 votes

1 answer

44 views

Number of logical cycles to implement $R_Z(\theta)$ gates in lattice surgery: why isn't it the number of layers $\times$ the $T$-count in $R_Z$?

Marco Fellous-Asiani

1,444

modified 36 mins ago

0 votes

1 answer

42 views

Custom gate labels in PennyLane

David Wierichs

206

modified 2 days ago

1 vote

2 answers

63 views

Why $\sqrt{\rho} = P \sqrt{\rho}$ in the proof of quantum error correction conditions in Nielsen & Chuang?

Adam Zalcman

20.8k

modified Dec 1 at 14:48

1 vote

1 answer

76 views

Problem with the mathematical definition of the eigenvalue algorithm on a specific exercise

Adam Zalcman

20.8k

modified 2 days ago

4 votes

1 answer

119 views

Bug in stim HERALDED_PAULI_CHANNEL_1?

FDGod

1,311

modified Dec 1 at 9:22

0 votes

0 answers

15 views

How to deal with unused qubits in application specific quantum chips?

Shadow43375

175

asked 2 days ago

2 votes

1 answer

62 views

How do I write a stim diagram to a file?

Craig Gidney

33.3k

answered Dec 1 at 6:36

1 vote

0 answers

37 views

Generalization of representing SU(2) as quaternions

Chris Henson

111

asked 2 days ago

2 votes

0 answers

93 views

Mutual information of shared state is larger than expectation values

FDGod

1,311

modified Dec 1 at 9:25

2 votes

1 answer

149 views

Problem with eigenvalue evaluation algorithm application on matrix $U$

Francescov20

35

modified Dec 1 at 10:19

5 votes

2 answers

82 views

Decomposition of a $4 \times 4$ unitary matrix

DaftWullie

55.8k

answered Nov 29 at 7:58

1 vote

2 answers

84 views

Is there a way to perform Zero Noise Extrapolation with qiskit without using the runtime service?

Elijah Pelofske

667

answered Nov 29 at 20:40

0 votes

1 answer

39 views

Matrices size of n-qubit controlled gates and n+2 states qubit?

glS♦

23.4k

modified Dec 1 at 11:52

2 votes

1 answer

51 views

Quantum homomorphic encryption with a classical verifier - clarifying the setting?

Tristan Nemoz

5,354

answered Nov 29 at 20:29

3 votes

1 answer

98 views

How much complexity is required to implement $\text{C$_\Pi$NOT}$ gate?

FDGod

1,311

modified Nov 29 at 6:38

2 votes

2 answers

61 views

What is the relation between number of measurements and additive error, when estimating the expectation value of an observable?

glS♦

23.4k

modified Nov 30 at 17:22

0 votes

1 answer

33 views

Litinsky's fast block scheme: should the tile count also include the number of purified magic-states

Craig Gidney

33.3k

answered Nov 29 at 22:35

4 votes

2 answers

323 views

How to convert a partially entangled state into maximally entangled using SLOCC

DaftWullie

55.8k

modified Nov 27 at 7:25

2 votes

1 answer

60 views

Underlying Hamiltonians and pulse level controls of different commercially available quantum computers

DaftWullie

55.8k

modified Nov 29 at 8:02

1 vote

0 answers

70 views

+50

How comes the constraint $\sum_{n, m \neq 1} \chi_{n m} \Upsilon_m^{\dagger} \Upsilon_n=0$?

Karry

657

modified Nov 29 at 13:13

1 vote

1 answer

38 views

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

FDGod

1,311

modified Nov 29 at 6:42

2 votes

0 answers

59 views

Are there quantum algorithms to estimate the partial transpose?

glS♦

23.4k

modified Nov 28 at 10:58

1 vote

0 answers

31 views

Effect of error correction gates in QCNN

FDGod

1,311

modified Nov 29 at 6:17

1 vote

1 answer

21 views

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

FDGod

1,311

modified Nov 29 at 6:30

0 votes

1 answer

20 views

How to get line fits from sinter.plot_error_rate to calculate logical error rate as function of physical

Craig Gidney

33.3k

answered Nov 29 at 10:04

1 vote

1 answer

25 views

Understanding command Ignore in Q#

FDGod

1,311

modified Nov 29 at 6:28

2 votes

0 answers

24 views

Role of eavesdroppers in B92 of phase modulation

FDGod

1,311

modified Nov 29 at 6:25

2 votes

1 answer

67 views

Is a process matrix of rank $1$ unique?

glS♦

23.4k

modified Nov 27 at 10:55

0 votes

1 answer

51 views

How to show that the GHZ state is absolutely maximally entangled?

glS♦

23.4k

modified Nov 27 at 10:31

0 votes

1 answer

53 views

Can you apply a CNOT gate on qubits in MBQC that aren´t next to each other?

Craig Gidney

33.3k

modified Nov 27 at 0:22

2 votes

2 answers

109 views

Preparation of logical state with qLDPC code

Craig Gidney

33.3k

modified Nov 27 at 5:42

0 votes

1 answer

44 views

Netlist of the transpiled circuit in Qiskit

luciano

5,573

modified Nov 29 at 11:44

0 votes

1 answer

36 views

Frequency of qubits in qiskit simulators

Yael Ben-Haim

841

answered Nov 27 at 5:48

4 votes

1 answer

189 views

How to characterize the extreme points of the set of CPTP maps?

Adam Zalcman

20.8k

modified Nov 24 at 13:48

Top Questions

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