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3:45 AM
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Q: Strong and weak simulations and the polynomial hierarchy collapse

Ninnat DangniamA common argument for quantum computational "supremacy" assumes that there exists a classical sampler that outputs a probability $q_x$, $x \in \{0,1\}^{2^n}$ that approximates an output probability $p_x$ of a quantum device up to an additive error, then uses Stockmeyer's counting to improve $q_x$...

 
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Q: Show $\langle \alpha| (\cos \mu)^{-a^{\dagger} a} | \alpha \rangle =e^{|\alpha|^2(\frac{1}{\cos \mu} -1)}$ for coherent states $|\alpha \rangle$

izimathI am reading"Quantum continuous variables, A primer of Theoretical Methods" by A.Serafini, page 120. Let $ a $ the annihilation operator for the Fock basis. I want to show $$\langle \alpha| (\cos \mu)^{-a^{\dagger} a} | \alpha \rangle =e^{|\alpha|^2(\frac{1}{\cos \mu} -1)}$$ for coherent s...

 
 
9 hours later…
1:07 PM
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Q: Phase Shift in Cirac-Zoller Quantum Gate

WasserwaageHow can we see that in the Cirac-Zoller phase gate, a $2 \pi$ laser pulse gives us a phase shift of $(-1)$? We apply a $2 \pi$ pulse tuned to the red sideband transition, which corresponds to a Hamiltonian $$ H ^ { - } = i \hbar \Omega \eta \left( \sigma _ { - } a ^ { \dagger } e ^ { - i \varph...

 
1:17 PM
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Q: Using Qiskit with Blender

Alain LioretI want to use Blender and Blender Python Scripts working with Qiskit. (want to make 3D creations) (www.blender.org) How can I do this ? (because when I try to install Qiskit inside Blender Python, it doesn't work ) How to make communication between Blender and Qiskit installed with Anaconda Pyt...

 
 
2 hours later…
3:05 PM
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Q: Quantum secret sharing

UpstartI was reading an article https://journals.aps.org/pra/abstract/10.1103/PhysRevA.71.044301 It had 3 parties Bob, Alice and Charlie. They agree on sharing a classical secret quantum mechanically. The steps they follow are for a particular case $N=3$, say Bob prepares $3$ states say $|0\rangle$, $...

 
 
7 hours later…
10:27 PM
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Q: How significant is polarisation?

Ted BoothLet's say you have a device that sucks air into a cylinder, and the device manages to suck not by having a propeller, but a symmetric mostly smooth surface spinning wheel, so that if you had a propeller, it pulls air or water towards the back of the propeller, and then sends a straight stream for...

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Q: Find the local unitary that takes the bell state to a state phi that has an extractable bell state

meelszzI have a state |p> that has an extractable Bell state and I want to write it as a Bell state, |b>, with a local unitary acting on one side. Basically I am trying to find a local unitary U that satisfies: |p> = U|b> |b> is a Bell state |p> is a known state with an extractable Bell state Does a...

 
10:47 PM
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Q: How is the Controlled Z Gate implement?

C. KangHow are 2 qubit Controlled Z gates (1 control / 1 target) typically implemented? Do we seek physical realizations of this gate, or have an alternate decomposition?

 

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