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DaftWullie's user avatar
DaftWullie's user avatar
DaftWullie
  • Member for 6 years
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3 votes
Accepted

Does $\frac{I + K}{2}\otimes\frac{I+L}{2} = \frac{I+K\otimes L}{2}$ hold for operators $K,L$ acting on different subsystems?

3 votes

How to perform amplitude amplification when the initial amplitude of aiming state is unknown

6 votes
Accepted

How to simulate low-rank hamiltonian?

5 votes
Accepted

How do magic states circumvent the Eastin-Knill theorem?

2 votes
Accepted

In the QFT, do the basis states $\{|k\pmod N\rangle\}_{k=0}^N$ only make sense when $N=2^n$?

3 votes
Accepted

How can quantum error correction correct small rotations/continuous errors?

5 votes

How do I transform a $ZZ$ interaction unitary into a $\text{CZ}$ gate?

3 votes
Accepted

Equivalence of quantum circuits

4 votes

What is the oracle in every quantum algorithm?

1 vote

Depolarizing channel on GHZ-state

1 vote

How to retrieve a phase gate from a circuit made out of $CX$ and $T$

3 votes
Accepted

How to get smaller stabilizer codes with Gottesman's construction?

6 votes
Accepted

Is it always possible to write the state corresponding to a set of stabilizer generators?

3 votes
Accepted

Can I obtain the pure state corresponding to a density matrix from its main diagonal?

3 votes
Accepted

Toffoli gate not included in the normalizer group

1 vote

How do I prove the following maps are completely positive?

1 vote
Accepted

Converting $H$ gate to $R_x$ and $R_z$

3 votes
Accepted

If $\rho_{AB}$ is a separable then the partial transpose w.r.t to A is PSD

0 votes

Error correction conditions for bit flip code

2 votes

What are toy examples of single-copy entanglement conversion?

2 votes
Accepted

How can a third party learn the coefficient of a shared $2n$-qubits state using a classical message from each one?

2 votes
Accepted

How to figure out the action of a circuit form its effect on logical operators?

2 votes

Codes saturating the bound d=(n+1)/2

1 vote
Accepted

Circumventing the Eastin-Knill theorem by means of Shor's fault tolerant Toffoli gate

4 votes
Accepted

Evolution of a state vector: Why is the action of $N$ equivalent to the action of $UNU^{†}$?

3 votes

Algorithm to reveal properties of a random quantum permutation gate

3 votes

Does independence from the input state imply a tensor product structure for the unitary?

3 votes
Accepted

Why can a quantum code correct $t$ errors only when $d \geq 2t + 1$?

2 votes
Accepted

Measuring one register of the state $\frac{1}{2^{m}} \sum_{x}\sum_{k} (-1) ^ {x\cdot k} |k\rangle |f(x)\rangle$

2 votes
Accepted

How to write the hamiltonian for w state?

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