Skip to main content
Share Your Experience: Take the 2024 Developer Survey

Top Questions

0 votes
1 answer
6 views

Why do we need/have the operator sum representation (Kraus representation)?

1 vote
0 answers
7 views

Do we consider the entangled-based protocol E91 to be a device-independent protocol?

2 votes
1 answer
66 views

Prove $\|{\cal E}(\rho-\sigma)\|_1\leq\|({\cal E}\otimes{\rm id})(U\{(\rho - \sigma)\otimes |0⟩⟨ 0|\}U^{\dagger})\|_1$ with $U$ a CNOT

1 vote
0 answers
30 views
+50

Solving quantum equation using qiskit

0 votes
1 answer
18 views

error correction after lattice surgery for merging

0 votes
0 answers
14 views

Decomposing density matrix into arbitrary minimal ensemble

0 votes
1 answer
15 views

Parallelizing decode_to_edges_array (PyMatching)

1 vote
1 answer
35 views

Cirq compilation process

-1 votes
2 answers
29 views

How to do quantum tomography on a subsystem of 2 of 30 qubits in cirq?

1 vote
1 answer
84 views

New QASM2ParseError for old circuit on IBM composer

0 votes
1 answer
21 views

Implementing CNOT logical gate for the Steane code

0 votes
0 answers
31 views

how to find a quantum gate matrix from RHO before and RHO after evolve

1 vote
1 answer
74 views

How to compute the post-measurement state when measuring only the first of a three-qubit system?

4 votes
2 answers
261 views

Are all stabilizer codes real? Or example stabilizer codes with $\pm i$ coefficients

0 votes
1 answer
18 views

How to understand the matrix representation of the Toffoli produced by qiskit?

1 vote
1 answer
18 views

How to calculate the number of m-partitions of an N-partite quantum state?

3 votes
2 answers
251 views

Is it possible to implement an in-place multiplication quantum circuit?

1 vote
0 answers
16 views

On Quantum Approximability Classes

0 votes
1 answer
46 views

How to use stim to implement a specific circuit

2 votes
0 answers
15 views

How to apply gates on a subspace of a superposition of qubits?

1 vote
0 answers
14 views

Cirac-Zoller CNOT gate implemented by Schmidt-Kaler

2 votes
2 answers
280 views

How to calculate the Schmidt decomposition of a state without SVD

0 votes
2 answers
25 views

What is meant with "different ensembles can give rise to the same density matrix?"

2 votes
2 answers
42 views

Calculating number of CNOT gates in Pauli evolution gate

1 vote
1 answer
154 views

Unable to use iSWAP in Qiskit TwoLocal entangling_block

0 votes
0 answers
17 views

How to convert each of the pure states ||0011⟩,||1100⟩,||0101⟩ each to ||1111⟩ using qiskit

1 vote
0 answers
17 views

Reasoning behind unitary freedom in the ensemble for density matrices theorem

0 votes
1 answer
37 views

Is there any another method for adjusting transverse field? (D'wave)

4 votes
2 answers
95 views

What is an example of a non-additive code that is not a CWS code?

3 votes
2 answers
74 views

Recognizing a CWS code in a specific case

0 votes
1 answer
35 views

Resource for geometric representation of quantum channels

1 vote
1 answer
57 views

Pauli Strings on the same qubit?

0 votes
0 answers
7 views

How to plot a histogram of a pulse-level quantum circuit simulation in QuTiP?

2 votes
1 answer
38 views

What is the F12 rule for the Game of Life

19 votes
6 answers
914 views

Counterexamples in quantum information theory

1 vote
0 answers
18 views

What could be intermediate steps towards a fully fault-tolerant quantum algorithm with added value for each step?

0 votes
0 answers
7 views

"Session has been closed" Error in solving Maxcut problem by QAOA

4 votes
3 answers
405 views

Where to find a generic implementation of Shor's algorithm with Qiskit?

1 vote
2 answers
86 views

Can Bell states be reexpressed with respect to arbitrary local bases?

1 vote
2 answers
723 views

Where do I create my first circuit?

1 vote
1 answer
63 views

How are edge weights "loaded" in the problem hamiltonian when solving TSP with QAOA?

1 vote
0 answers
19 views

Experimental implementation of addition on a quantum computer

3 votes
1 answer
89 views
+50

What's the cost of finding $(x,y)$ such that $g(f(x),y)=1$ via Grover?

2 votes
0 answers
32 views

Codes from orthogonal stabilizer states

6 votes
2 answers
652 views

Example non-stabilizer code?

4 votes
3 answers
621 views

Can Kraus operators change a mixed state into a pure state?

1 vote
1 answer
283 views

Can a unital channel not be mixed unitary?

2 votes
1 answer
29 views

Is the adjoint of a strictly positive channel again strictly positive?


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