Quantum Computing

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Awarded 434 times.
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
Good introductory material on quantum computational complexity classes
Awarded Oct 31, 2019 at 13:35
What does Google's claim of "Quantum Supremacy" mean for the question of BQP vs BPP vs NP?
Awarded Oct 24, 2019 at 13:55
How is Grover's algorithm used to estimate the mean and median of a set of numbers?
Awarded Oct 1, 2019 at 12:15
What exactly is "Random Circuit Sampling"?
Awarded Sep 28, 2019 at 23:40
What is quantum entanglement, and what role does it play in quantum error correction?
Awarded Sep 23, 2019 at 15:20
Why is an oracle qubit necessary in Grover's algorithm?
Awarded Aug 18, 2019 at 16:20
Composing multiple quantum circuits in single quantum program in Qiskit
Awarded Aug 8, 2019 at 18:45
Devising "structured initial guesses" for random parametrized quantum circuits to avoid getting stuck in a flat plateau
Awarded Aug 6, 2019 at 13:10
Simulating Clifford + few-T circuits
Awarded Jul 19, 2019 at 5:55
Is my background sufficient to start quantum computing?
Awarded Jul 14, 2019 at 7:45
Hamiltonian simulation with complex coefficients
Awarded Jul 4, 2019 at 11:25
How is the Grover-Algorithm applied to a database?
Awarded Jul 2, 2019 at 21:40
Does a study guide exist that starts from a "purely CS background" and advances towards "making a new quantum programming language"?
Awarded Jun 23, 2019 at 6:35
Can quantum computing be profitable without quantum hardware?
Awarded Jun 17, 2019 at 11:55
Is swap gate equivalent to just exchanging the wire of the two qubits?
Awarded Jun 16, 2019 at 6:20
General construction of $W_n$-state
Awarded Jun 11, 2019 at 2:15
Quantum algorithm for linear systems of equations (HHL09): Step 1 - Confusion regarding the usage of phase estimation algorithm
Awarded Jun 11, 2019 at 1:20
Why does the "Phase Kickback" mechanism work in the Quantum phase estimation algorithm?
Awarded Jun 9, 2019 at 17:30
How power-efficient are quantum computers?
Awarded Jun 8, 2019 at 19:05
How are quantum gates implemented in reality?
Awarded May 23, 2019 at 19:55
Is acting with a positive map on a state not part of a larger system allowed?
Awarded May 21, 2019 at 20:50
What is the longest time a qubit has survived with 0.9999 fidelity?
Awarded May 14, 2019 at 6:30
Simulating a system inside a system
Awarded May 9, 2019 at 11:50
How many operations can a quantum computer perform per second?
Awarded May 2, 2019 at 18:00
Simulate hamiltonian evolution
Awarded May 1, 2019 at 13:15
What kinds of ions do trapped ion quantum computers use?
Awarded Apr 29, 2019 at 15:40
Why is an entangled qubit shown at the origin of a Bloch sphere?
Awarded Apr 29, 2019 at 10:40
Is quantum computing mature enough for a computer scientist with no physics background?
Awarded Apr 16, 2019 at 18:20
Does Shor's algorithm end the search for factoring algorithms in the quantum world of computation?
Awarded Apr 15, 2019 at 11:30
How would I implement the quantum oracle in Deutsch's algorithm?
Awarded Mar 28, 2019 at 1:35
What is a list of research journals publishing quantum computing articles?
Awarded Mar 27, 2019 at 23:55
Implementation of the oracle of Grover's algorithm on IBM Q using three qubits
Awarded Mar 19, 2019 at 8:35
Quantum phase estimation and HHL algorithm - knowledge of eigenvalues required?
Awarded Mar 19, 2019 at 8:35
Quantum machine learning after Ewin Tang
Awarded Feb 23, 2019 at 0:40
How to derive the CNOT matrix for a 3-qubit system where the control & target qubits are not adjacent?
Awarded Feb 13, 2019 at 21:45
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