4
votes
Is quantum computation effectiveness dependent on EPR non-locality?
No, because there's no need for the hidden-variable theory to be easy to simulate. It doesn't help at all to have everything pre-determined if it's computationally expensive to follow the evolution. A ...
- 2,893
2
votes
Accepted
How do I multiply a Bell state with a measurement operator?
The Bell state is shared by two parties: Alice and Bob. The measurement is performed just by Alice. So you need to know how to convert something that just Alice does into something both Alice and Bob ...
- 60.7k
2
votes
Accepted
Is there a generalized quantum teleportation for n-qubit entangled states?
As mentioned in the link shared the the OP, a simple way to extend the teleportation protocol to $n$ qubits is to basically replicate the teleportation procedure for each of the qubits. This works ...
- 1,270
2
votes
When performing a projective measurement on a subsystem X entangled with another system Y, can the evolution of Y be unitary?
Non existence for "forgetful" measurements
Suppose after the entangling operation the state is some $\rho_{XY}$. Given a POVM $\{M_a\}_a$ we can describe the final state of system $Y$ and ...
- 6,226
2
votes
Is entanglement distillation possible between states of different fidelities?
In "Tetrationally Compact Entanglement Purification" I distill EPR pairs using a mix of low-error and high-error pairs. I feed high-noise EPR pairs into a low-noise EPR pair, which makes it ...
- 40.8k
1
vote
What are hamiltonians in the context of quantum computing
What exactly is a Hamiltonian in the context of quantum computing?
The Hamiltonian is an equation that describes how a physical system behaves. The Hamiltonian reflects the physical interactions ...
- 124
1
vote
Is there a generalized quantum teleportation for n-qubit entangled states?
Teleportation does not break entanglement. That means that for a general entangled state over $n$ qubits
$$
(\alpha \left|{\psi}\right\rangle\otimes\left|{0}\right\rangle + \beta \left|{\psi'}\right\...
- 21
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