Quantum Computing

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Awarded 469 times.
Is there a name for the 3-qubit gate that does NOT NOT NOTHING?
Awarded Dec 31, 2020 at 15:21
Quantum Walk: Why the need of adding "tail" nodes to the root?
Awarded Dec 31, 2020 at 8:16
Understanding Google's “Quantum supremacy using a programmable superconducting processor” (Part 1): choice of gate set
Awarded Dec 27, 2020 at 21:42
Active improving of nanodiamond surfaces for NV centers?
Awarded Dec 20, 2020 at 3:32
Tools for creating quantum circuit diagrams
Awarded Dec 19, 2020 at 22:17
Why isn't there a contradiction between the existence of CNOT gate/entanglement and the no-cloning theorem?
Awarded Dec 18, 2020 at 20:51
What is a Bacon-Shor code and what is its significance?
Awarded Dec 17, 2020 at 20:42
Quantum Algorithm for God's Number
Awarded Nov 24, 2020 at 8:16
Density matrix after measurement on density matrix
Awarded Nov 16, 2020 at 5:51
What is a "barrier" in Qiskit circuits?
Awarded Nov 14, 2020 at 16:04
How to implement the 4 Bell states on the IBM Q (composer)?
Awarded Nov 10, 2020 at 22:31
What are magic states?
Awarded Nov 6, 2020 at 0:07
How to calculate circuit depth properly?
Awarded Nov 1, 2020 at 8:51
What do they mean by "qubit can't be copied"?
Awarded Oct 24, 2020 at 20:27
Does quantum computing already possess the level of abstraction to be explicable even without knowledge of physics?
Awarded Oct 22, 2020 at 16:42
Superposition of quantum circuits
Awarded Oct 17, 2020 at 20:27
Shortest sequence of universal quantum gates that correspond to a given unitary
Awarded Oct 2, 2020 at 19:05
Submitting jobs to IBMQ backend via HTTP API Requests
Awarded Oct 1, 2020 at 6:55
How to implement a matrix exponential in a quantum circuit?
Awarded Sep 23, 2020 at 16:16
Can quantum computers handle 'big' data?
Awarded Aug 26, 2020 at 12:40
Implementing "Classical AND Gate" and "Classical OR Gate" with a quantum circuit
Awarded Aug 21, 2020 at 16:06
Resources for quantum algorithm basics
Awarded Aug 21, 2020 at 16:06
Is there an intuition built on ansatz in VQE algorithm or is it more a trial and error approach?
Awarded Aug 3, 2020 at 15:25
How do I build a gate from a matrix on Qiskit?
Awarded Jul 23, 2020 at 3:49
How many bits do Alice and Bob needs to compare to make sure the channel is secure in BB84?
Awarded Jul 22, 2020 at 20:01
Circuit construction for Hamiltonian simulation
Awarded Jul 3, 2020 at 10:04
What is the Helstrom measurement?
Awarded Jun 30, 2020 at 11:58
How to understand the Haar measure from a quantum information perspective?
Awarded Jun 18, 2020 at 22:06
Why are half angles used in the Bloch sphere representation of qubits?
Awarded Jun 12, 2020 at 22:19
How to construct a multi-qubit controlled-Z from elementary gates?
Awarded Jun 10, 2020 at 16:46
Does the Curry-Howard correspondence have a quantum-specific type system?
Awarded Jun 7, 2020 at 12:42
What can we learn from 'quantum bogosort'?
Awarded May 29, 2020 at 14:07
Simplification of "rotation swapping" circuit
Awarded May 15, 2020 at 20:27
How to construct matrix of regular and "flipped" 2-qubit CNOT?
Awarded May 7, 2020 at 16:25
Quantum algorithm for QR and SVD matrix decomposition?
Awarded May 5, 2020 at 13:05
How many two-qubit gates are required to implement a general N-qubit unitary?
Awarded Apr 27, 2020 at 9:57
No-cloning theorem and distinguishing between two non-orthogonal quantum states
Awarded Apr 2, 2020 at 7:00
What is the difference between a relative phase and a global phase? In particular, what is a phase?
Awarded Mar 31, 2020 at 23:10
How is computation done in a 2D surface code array?
Awarded Mar 26, 2020 at 21:30
Embedding classical information into norm of a quantum state
Awarded Mar 11, 2020 at 0:10
How to think about the Z gate in a Bloch sphere?
Awarded Mar 5, 2020 at 4:00
What is the opposite of measurement, in a quantum circuit?
Awarded Mar 4, 2020 at 13:05
Which subatomic particle does each company use in quantum computing?
Awarded Feb 29, 2020 at 23:30
Can we combine the square roots inside the definition of the fidelity?
Awarded Feb 24, 2020 at 17:50
How to input 2 qubits in 2 Hadamard gates?
Awarded Feb 23, 2020 at 11:50
Graphical Calculus for Quantum Circuits
Awarded Feb 7, 2020 at 14:25
Is the Pauli group for $n$-qubits a basis for $\mathbb{C}^{2^n\times 2^n}$?
Awarded Jan 21, 2020 at 14:00
State of the art in quantum memory
Awarded Jan 9, 2020 at 13:35
Can we speed up the Grover's Algorithm by running parallel processes?
Awarded Jan 7, 2020 at 22:50
What counts as an "ancilla" qubit?
Awarded Dec 26, 2019 at 20:25
Can quantum computing contribute to the development of artificial intelligence?
Awarded Dec 16, 2019 at 1:30
The algorithm of the new quantum factoring record 1,099,551,473,989
Awarded Dec 15, 2019 at 18:55
What's the difference between a pure and mixed quantum state?
Awarded Dec 11, 2019 at 18:40
Quantum circuits explain algorithms, why didn't classical circuits?
Awarded Dec 6, 2019 at 12:20
Density matrices for pure states and mixed states
Awarded Nov 26, 2019 at 0:50
Is there a list of accessible open problems in quantum computing from a theoretical computer science perspective?
Awarded Nov 14, 2019 at 19:40
Why do the IBM and Google processors both have 53 qubits?
Awarded Nov 6, 2019 at 3:40
Effects of quantum computing on parallel universes
Awarded Nov 4, 2019 at 20:35
How are magic states defined in the context of quantum computation?
Awarded Nov 2, 2019 at 22:00
Separating NP from BQP relative to an oracle
Awarded Oct 31, 2019 at 18:50
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