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How can I build up an arbitrary quantum circuit given a certain unitary matrix operation?

answered 29 mins ago Martin Vesely 1,525

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What does it mean by less than identity in operator sum representation?

quantum-operation operator-sum

modified 11 hours ago Sanchayan Dutta 12.8k

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35

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How many real-valued coefficients does it take to specify an $n$-qubit state?

quantum-state

answered 2 hours ago glS 8,797

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26

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More broken older Qiskit code

qiskit

answered 23 hours ago Steve Wood 46

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Are there different orderings of the fifteen SU(4) generators in common use?

quantum-state entanglement density-matrix unitarity

modified 22 hours ago Martin Vesely 1,525

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17

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UCCSD in qiskit deprecated?

qiskit

modified 22 hours ago Martin Vesely 1,525

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54

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Problem 2.2 in Nielsen & Chuang - Properties of the Schmidt number

mathematics nielsen-and-chuang

modified 2 hours ago glS 8,797

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Quantum computing in finance - list of articles

algorithm resource-request quantum-computing-for-finance

modified 9 hours ago Martin Vesely 1,525

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31

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IBM qiskit vs Microsoft QDK

programming qiskit q#

modified yesterday Martin Vesely 1,525

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45

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How to find eigenvalues and eigenvector for a quantum gate?

quantum-gate quantum-state

modified yesterday Martin Vesely 1,525

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43

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Can we apply Grover to meet-in-the-middle attack?

algorithm quantum-gate quantum-information

modified 7 hours ago Phuong Pham Thi Minh 11

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Are there Bell-like violations that can be observed without collecting statistics?

quantum-information resource-request bell-experiment non-locality

modified 17 hours ago Craig Gidney 7,551

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What are the properties of qubit transformation?

quantum-gate quantum-state measurement

modified yesterday Coder 177

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47

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Implementing four oracles for the Deutsch Algorithm (preferably on IBM Q Experience)

ibm-q-experience deutsch-jozsa-algorithm

modified 2 days ago Martin Vesely 1,525

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2

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91

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What is the property of any entangled pair of qubits?

entanglement measurement bell-basis

modified 4 hours ago JSdJ 609

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67

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Optimizing over quantum channels

quantum-channel optimization

modified Jan 16 at 17:01 John Watrous 2,398

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Quantum Principal Component analysis by Seth Lloyd

mathematics quantum-operation tensor-product

modified Jan 17 at 13:18 kludg 1,664

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52

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Problems with Q# installing

q#

modified Jan 17 at 5:52 Martin Vesely 1,525

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64

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What is the |+⟩ and |-⟩ state?

quantum-state hadamard

modified Jan 16 at 11:35 luigi 31

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85

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Can a qubit be in the inside of the Bloch Sphere?

quantum-state bloch-sphere

modified Jan 16 at 12:10 glS 8,797

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117

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Building a DIY quantum computer - how to reduce a noise?

physical-realization physical-qubit noise

modified yesterday Martin Vesely 1,525

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96

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Non-unitary matrix decomposition as a sum of unitary matrices

mathematics matrix-representation

modified Jan 15 at 14:37 Danylo Y 2,441

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53

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How can I check if the following are possible states of a qubit?

quantum-state nielsen-and-chuang

modified Jan 16 at 12:09 glS 8,797

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55

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How to compute the probability of finding a given state in the $|+\rangle$ state?

quantum-state measurement

modified Jan 17 at 11:32 glS 8,797

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44

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How to make a Shor's algorithm for an arbitrary number of qubits with Qiskit on a IBM machine?

qiskit ibm-q-experience shors-algorithm

answered Jan 16 at 8:30 jul 36

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140

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How to realize this quantum error correction circuit on real hardware?

qiskit error-correction

answered Jan 13 at 18:37 Martin Vesely 1,525

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78

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How many $n$-qubit states are entangled?

quantum-information entanglement

modified Jan 15 at 12:21 glS 8,797

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56

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Grover diffusion operator for a 3 qubit system

algorithm grovers-algorithm amplitude-amplification

modified Jan 14 at 22:29 Martin Vesely 1,525

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30

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Does anyone have any really good quantum computing illustration packages or frameworks for visually teaching various aspects of QC?

programming resource-request

modified Jan 15 at 12:49 met927 1,448

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1

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49

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What is the outcome of this circuit?

quantum-gate

modified Jan 13 at 18:07 Davit Khachatryan 231

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78

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Is it possible to create a Q# operation with optional parameters?

programming q#

answered Jan 14 at 21:02 Chris Granade 473

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47

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Logical Explanation behind second reflection in Grover's algorithm

algorithm programming grovers-algorithm

answered Jan 13 at 23:16 cnada 3,524

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45

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Q# code for making any two qubits entangled

programming q#

modified Jan 14 at 20:14 At2005 77

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109

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What is the best way to get into and learn quantum computing for a 14 year old?

resource-request

answered 10 hours ago Steven Sagona 364

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32

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Grover's algorithm for 3SAT problem gives erroneous results

qiskit grovers-algorithm ibm

modified Jan 14 at 22:29 Abel Denis Ardelean 11

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22

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Stabilizer circuit synthesis via Clifford gates

circuit-construction stabilizer-code

asked Jan 14 at 16:25 Josu Etxezarreta Martinez 2,605

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120

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What unitary gate produces these quantum states from the computational basis?

quantum-gate quantum-state unitarity

modified Jan 10 at 9:44 Martin Vesely 1,525

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199

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What kind of errors does the master equation in the Lindblad form describe, continuous errors or discrete errors?

error-correction nielsen-and-chuang noise

modified Jan 10 at 14:12 Martin Vesely 1,525

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39

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How to know if any two arbitrary qubits are entangled? [duplicate]

quantum-state entanglement measurement

modified Jan 13 at 21:45 Coder 177

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48

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Use Qiskit in other programming languages (C#, JavaScript and Lua)

qiskit

modified Jan 13 at 15:15 Huang Junye 151

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1

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90

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How to invoke a C# method inside a Q# operation?

programming q#

answered Jan 11 at 20:22 Mariia Mykhailova 4,118

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0

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51

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What are quantum inspired algorithms?

algorithm

asked Jan 12 at 22:23 LeWoody 329

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48

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Travelling salesman problem on quantum computer

speedup optimization phase-estimation quantum-computing-for-finance

modified Jan 12 at 22:00 Martin Vesely 1,525

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46

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How to reduce the length of Q# programs execution time?

programming q#

modified Jan 12 at 20:58 Coder 177

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40

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max_cut in qiskit aqua

qiskit

answered Jan 15 at 4:58 Parfait Atchadé 21

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33

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Block codes with better parameters vs. surface codes, which need less ancilla qubits?

error-correction stabilizer-code surface-code

answered Jan 13 at 9:13 Patrick Fuentes 158

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64

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Problem involving entanglement swapping

entanglement measurement teleportation

modified Jan 11 at 10:47 Danylo Y 2,441

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26

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Negating amplitude in amplitude amplification when second qubit is 0 not working

algorithm grovers-algorithm amplitude-amplification

modified Jan 12 at 18:21 Martin Vesely 1,525

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