glS

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nielsen-and-chuang

98/100 score

33/20 answers

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Research Assistant

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19

What is the difference between superpositions and mixed states?

Mar 29, 2018

18

Why are half angles used in the Bloch sphere representation of qubits?

Aug 30, 2018

17

General parametrisation of an arbitrary $2 \times 2$ unitary matrix

Jan 14, 2019

16

Given a decomposition for a unitary $U$, how do you decompose the corresponding controlled unitary gate $C(U)$?

Mar 26, 2018

15

If all quantum gates must be unitary, what about measurement?

Mar 15, 2018

Questions

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44

How is the oracle in Grover's search algorithm implemented?

Mar 17, 2018

34

Are there problems in which quantum computers are known to provide an exponential advantage?

Mar 15, 2018

23

What is the difference between transmon and Xmon qubits?

Mar 31, 2018

21

What protocols have been proposed to implement quantum RAMs?

Mar 14, 2018

21

Why can the Discrete Fourier Transform be implemented efficiently as a quantum circuit?

May 3, 2018

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quantum-state

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textbook-and-exercises

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quantum-gate

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mathematics

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quantum-operation

161

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100

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Reputation

+10

How do you test a pair of unknown qubits for orthogonality with certainty?

+10

What is the initial state in the second register in Shor's algorithm?

+10

Is it possible to produce an entangled state by measuring an unentangled state?

+10

How to compute marginal probabilities of Alice's qubit (in density operator language)?

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Quantum Computing ♦

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