User chrysaor4

29 votes

5 answers

3k views

What's the point of Grover's algorithm if we have to search the list of elements to build the oracle?

grovers-algorithm

incud

715

asked May 20, 2018 at 11:41

27 votes

6 answers

9k views

How do I build a gate from a matrix on Qiskit?

Nillmer

655

asked Dec 16, 2018 at 17:13

22 votes

2 answers

4k views

What is the difference between transmon and Xmon qubits?

physical-qubit architecture superconducting-quantum-computing

glS♦

19.1k

asked Mar 31, 2018 at 16:20

22 votes

3 answers

4k views

What are magic states?

quantum-gate quantum-state error-correction universal-gates fault-tolerance

김동민

787

asked Sep 7, 2020 at 13:24

20 votes

2 answers

655 views

Can adiabatic quantum computing be faster than Grover's algorithm?

grovers-algorithm adiabatic-model

Dyon J Don Kiwi van Vreumingen

755

asked Jun 15, 2018 at 18:02

19 votes

4 answers

2k views

Alternative to Bloch sphere to represent a single qubit

quantum-state

incud

715

asked Apr 7, 2018 at 9:50

15 votes

0 answers

291 views

Reference that explains how to read 3d topological diagrams for surface code computations

resource-request error-correction topological-quantum-computing surface-code

Craig Gidney

23.3k

asked Jan 27, 2019 at 8:41

14 votes

5 answers

594 views

Why do error correction protocols only work when the error rates are already significantly low to begin with?

error-correction fault-tolerance

glS♦

19.1k

asked Mar 27, 2018 at 17:09

12 votes

1 answer

2k views

Are circuits with more than 1000 gates common?

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Alejandro Arcila

131

asked May 31, 2021 at 21:01

10 votes

2 answers

414 views

Are there any algorithms that take measurements in an intermediate step?

circuit-construction measurement deferred-measurement

John Wong

291

asked Dec 31, 2020 at 17:13

9 votes

0 answers

419 views

Can we use quantum phase estimation to learn anything about the dynamics of puzzles like the Rubik's cube?

hamiltonian-simulation phase-estimation applications

Mark S

7,444

asked Sep 29, 2021 at 21:02

9 votes

2 answers

339 views

If Majorana qubits are analogous to surface codes, why do the diagrams use lines instead of squares?

error-correction surface-code majorana-particle

Craig Gidney

23.3k

asked Feb 21 at 18:28

8 votes

3 answers

2k views

Calculating the expectation value of a unitary operator on a quantum computer

algorithm

Andrey Kardashin

83

asked Apr 29, 2019 at 16:01

8 votes

2 answers

744 views

Expected repetitions of the quantum part of Shor's algorithm

algorithm shors-algorithm

Craig Gidney

23.3k

asked Dec 13, 2018 at 0:42

8 votes

0 answers

341 views

Requirements for Achieving a Quantum Speedup

algorithm speedup d-wave universal-gates

DaftWullie

47.5k

asked Apr 11, 2018 at 10:12

8 votes

0 answers

263 views

How does the invertibility of a quantum map reflect on its Kraus operators?

quantum-operation kraus-representation

glS♦

19.1k

asked Aug 18, 2021 at 16:58

8 votes

2 answers

514 views

What is the relation between POVMs and observables (as Hermitian operators)?

measurement notation povm

glS♦

19.1k

asked Mar 10, 2021 at 13:54

7 votes

1 answer

295 views

Understanding classical vs. quantum channel capacities

quantum-operation information-theory entropy channel-capacity

Tobias Fritzn

601

asked Apr 2, 2019 at 9:00

7 votes

4 answers

293 views

Simulating a quantum circuit with decoherence and noise

density-matrix noise decoherence

Anna Naden

645

asked Dec 22, 2021 at 6:18

7 votes

1 answer

987 views

Physical implementation of gates on IBM Q

quantum-gate ibm-q-experience physical-realization

Martin Vesely

11.8k

asked Mar 17, 2020 at 12:36

6 votes

2 answers

241 views

Can we rotate Bloch vectors for qudits like we do with qubits in the Bloch sphere?

quantum-gate bloch-sphere qudit qutrit

Parmeet Singh EP 066

301

asked Dec 21, 2021 at 10:34

6 votes

1 answer

103 views

Why does code switching not allow for universal fault-tolerant quantum computation?

error-correction quantum-operation stabilizer-code

PhysMath

297

asked May 2 at 13:14

6 votes

2 answers

845 views

How to define a quantum channel for the partial trace?

quantum-operation

John

89

asked Nov 15, 2019 at 10:32

6 votes

1 answer

301 views

What are examples of extremal non-projective POVMs?

measurement quantum-operation povm

glS♦

19.1k

asked May 5, 2021 at 0:13

6 votes

3 answers

758 views

Nielsen&Chuang 5-qubit quantum error-correction encoding gate

error-correction nielsen-and-chuang textbook-and-exercises

draks ...

618

asked Oct 20, 2020 at 8:40

6 votes

2 answers

399 views

Are three POVM measurements on a single qubit physically realizable?

measurement textbook-and-exercises nielsen-and-chuang povm

czwang

789

asked Nov 17, 2019 at 0:10

6 votes

2 answers

96 views

Can you make anyons in 3 dimensions using rings?

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MaudPieTheRocktorate

231

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5 votes

2 answers

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Determining whether there exists an equivalent set of unitary Kraus operators

quantum-operation noise kraus-representation

forky40

4,942

asked Jun 29, 2021 at 20:27

5 votes

2 answers

589 views

Inverting the depolarizing channel

quantum-operation linear-algebra depolarizing-channel shadow-tomography

forky40

4,942

asked Jul 30, 2021 at 21:18

5 votes

3 answers

2k views

Why does quantum computing generally use matrix formulation of quantum mechanics rather than a continuous variable formulation?

mathematics history foundations

LeWoody

724

asked Dec 23, 2019 at 2:57

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What's the point of Grover's algorithm if we have to search the list of elements to build the oracle?

How do I build a gate from a matrix on Qiskit?

What is the difference between transmon and Xmon qubits?

What are magic states?

Can adiabatic quantum computing be faster than Grover's algorithm?

Alternative to Bloch sphere to represent a single qubit

Reference that explains how to read 3d topological diagrams for surface code computations

Why do error correction protocols only work when the error rates are already significantly low to begin with?

Are circuits with more than 1000 gates common?

Are there any algorithms that take measurements in an intermediate step?

Can we use quantum phase estimation to learn anything about the dynamics of puzzles like the Rubik's cube?

If Majorana qubits are analogous to surface codes, why do the diagrams use lines instead of squares?

Calculating the expectation value of a unitary operator on a quantum computer

Expected repetitions of the quantum part of Shor's algorithm

Requirements for Achieving a Quantum Speedup

How does the invertibility of a quantum map reflect on its Kraus operators?

What is the relation between POVMs and observables (as Hermitian operators)?

Understanding classical vs. quantum channel capacities

Simulating a quantum circuit with decoherence and noise

Physical implementation of gates on IBM Q

Can we rotate Bloch vectors for qudits like we do with qubits in the Bloch sphere?

Why does code switching not allow for universal fault-tolerant quantum computation?

How to define a quantum channel for the partial trace?

What are examples of extremal non-projective POVMs?

Nielsen&Chuang 5-qubit quantum error-correction encoding gate

Are three POVM measurements on a single qubit physically realizable?

Can you make anyons in 3 dimensions using rings?

Determining whether there exists an equivalent set of unitary Kraus operators

Inverting the depolarizing channel

Why does quantum computing generally use matrix formulation of quantum mechanics rather than a continuous variable formulation?