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6 votes
3 answers
735 views

Are there even distance color codes?

5 votes
2 answers
380 views

Represent Hadamard gate in terms of rotations and reflections in Bloch sphere

4 votes
3 answers
442 views

Non-universal and non classically simulatable gate set?

4 votes
3 answers
438 views

Why focus on T gates and not some other single qubit rotation R making Clifford + R universal?

3 votes
2 answers
473 views

Does QEC always eventually fail in a deep circuit?

9 votes
1 answer
350 views

The quantum complexity of implementing a permutation matrix

7 votes
1 answer
143 views

What is the stabilizer rank of the W state?

1 vote
2 answers
142 views

Definition of a quantum gate

6 votes
1 answer
229 views

What problems in chemistry or materials science could be solved with 100 fault-tolerant qubits?

2 votes
1 answer
208 views

Why are only projective measurements considered in nonlocal games to get optimal strategy?

3 votes
2 answers
46 views

Does $N(U\rho U^\dagger)=U' N(\rho)U'^\dagger$ for unitaries $U,U'$ and a channel $N$ imply $UK_i=K_i U'$?

1 vote
2 answers
96 views

Definition of threshold/pseudothreshold/breakeven in QECC

1 vote
2 answers
150 views

How to implement a quantum multiplier in Qiskit 1.0

3 votes
2 answers
81 views

Is $\{CNOT, CZ, T\}$ a universal gate set?

4 votes
2 answers
94 views

What are some good additional resources when taking IBM Qiskit course?

4 votes
1 answer
118 views

Is purity convex in time?

3 votes
1 answer
145 views

Do all Hermiticity-preserving maps generate completely positive maps?

1 vote
1 answer
163 views

Single bit teleportation for Hadamard gate

0 votes
1 answer
121 views

Is there a tool to decompose 4-Qubit unitaries (aka 16x16 matrices)?

3 votes
1 answer
76 views

Implementing the reflection in Grover's algorithm with $\{\mathtt{CNOT}, H, X\}$

3 votes
1 answer
76 views

Will logical clock cycle time be a limiting factor for quantum computations?

2 votes
2 answers
255 views

What is a 2way quantum computer (2WQC)?

2 votes
1 answer
73 views

Locally transforming a color code into two surface codes

2 votes
2 answers
67 views

Better constant for linear depth incrementers

3 votes
1 answer
51 views

Optimization in QAOA should only return global minimum?

2 votes
1 answer
84 views

Finding Eigenvectors of a Unitary in a Quantum circuit

-2 votes
2 answers
77 views

Are quantum advantages all about storing different weighted states with few qubits?

4 votes
0 answers
156 views

Can the W state, or any non-stabilizer state for that matter, be considered a magic state?

1 vote
2 answers
72 views

Can non-linear operations be implemented as a circuit on a quantum computer?

0 votes
2 answers
92 views

Simple basic qiskit example program [closed]

2 votes
1 answer
91 views

Common ways to fault tolerantly prepare a stabilizer state

1 vote
2 answers
88 views

Hamiltonian Simulation: What's the meaning of t in $\exp(iAt)$?

-2 votes
1 answer
67 views

Decomposition of a quantum gate into Rx Ry Rz

1 vote
1 answer
83 views

For CHSH game, why does the mathematica program gives 75% as the best winning rate when sharing 2 EPR pairs?

1 vote
1 answer
39 views

Implementation of a unitary operator scaled by a factor

6 votes
0 answers
105 views
+50

Universal gate set for the $ [[15,1,3]] $ code

0 votes
3 answers
62 views

Does the threshold estimation of the surface code not need a fault-tolerant setup?

1 vote
2 answers
48 views

Why does it matter that Schmidt number is invariant under unitary transformations?

1 vote
1 answer
59 views

Clarification about the Alberti's Theorem proof given by Watrous in his condensed lecture notes

2 votes
1 answer
123 views

Cannot get a correct quantum count for a sudoku example

0 votes
1 answer
95 views

How to convert states |0011⟩, |1100⟩, |0101⟩ to |1111⟩?

3 votes
2 answers
57 views

Is every pure 1-qubit state an eigenstate of $aX + bY + cZ$?

2 votes
1 answer
56 views

What is XX/YY/ZZ-interaction (or coupling)?

2 votes
1 answer
56 views

How to apply the QAOA in such a QUBO problem?

4 votes
1 answer
71 views

What is the domain of the dual map of a quantum channel?

1 vote
2 answers
43 views

What exactly is the change in domain for the Quantum Fourier Transform?

1 vote
1 answer
67 views

How do I apply the negative of a gate in Qiskit

1 vote
1 answer
86 views

An equivalent classical circuit for Hadamard gate


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