Homework Help: Quantum Physics

Posted by helpful on Monday, March 18, 2013 at 3:17am.

Consider the following quantum circuit:

bit.ly/Zlrijv

(a) What quantum state do you have to input in order to get output |00>?

(b) What quantum state do you have to input in order to get output |11>?

(c) What quantum state do you have to input in order to get output 1/√2(|00>+|11>)?

Quantum Physics - Awesome Dude, Monday, March 18, 2013 at 3:17am
a) 1/sqrt(2) 0
0 1/sqrt(2)
Quantum Physics - helpman, Monday, March 18, 2013 at 7:14am
please (b) and (c)
Quantum Physics - Anonymous, Monday, March 18, 2013 at 10:06am
b is:

0 1/sqrt(2)
-1/sqrt(2) 0

what is the answer to 13?
Quantum Physics - what's (c), Monday, March 18, 2013 at 10:56am
what's (c)
Quantum Physics - Gyano, Monday, March 18, 2013 at 12:56pm
c please
the answer for 13 is c
Quantum Physics - Ula, Monday, March 18, 2013 at 3:45pm
If the first qubit is in the state 2/sqrt(5)|0> - 1/sqrt(5)|1> and the second qubit is in the state 1/sqrt(2)|0> - i/sqrt(2)|1>, what is the state of the composite system?
Quantum Physics - Anonymous, Monday, March 18, 2013 at 3:49pm
c)
1/2 1/2
-1/2 1/2

Are you sure 13 is c?
Quantum Physics - Anonymous, Monday, March 18, 2013 at 3:50pm
what is the answer for this:
Let |ψ⟩=1−i2|0⟩−1+i2|1⟩ and |ϕ⟩=2+i3|0⟩−2i3|1⟩. What is ⟨ψ|ϕ⟩?
Quantum Physics - Anonymous, Monday, March 18, 2013 at 3:52pm
please a answer for this:
What is the matrix (4x4) for ZX (Z applied on the first qubit and X applied on the second qubit)?
Quantum Physics - Neo, Monday, March 18, 2013 at 5:31pm
Anyone please:

If the first qubit is in the state 2/sqrt(5)|0> - 1/sqrt(5)|1> and the second qubit is in the state 1/sqrt(2)|0> - i/sqrt(2)|1>, what is the state of the composite system?
Quantum Physics - TIGER, Monday, March 18, 2013 at 6:34pm
2) LINE 1. 2/(sqrt(2)*sqrt(5) (2*i)/(sqrt(2)*sqrt(5))
LINE 2. -1/(sqrt(2)*sqrt(5))
-i/(sqrt(2)*sqrt(5))

What is the matrix (4x4) for ZX (Z applied on the first qubit and X applied on the second qubit)?
Quantum Physics - TIGER, Monday, March 18, 2013 at 6:34pm
2) LINE 1. 2/(sqrt(2)*sqrt(5) (2*i)/(sqrt(2)*sqrt(5))
LINE 2. -1/(sqrt(2)*sqrt(5))
-i/(sqrt(2)*sqrt(5))

What is the matrix (4x4) for ZX (Z applied on the first qubit and X applied on the second qubit)?
Quantum Physics - TIGER, Monday, March 18, 2013 at 6:36pm
Let |ψ⟩=1−i2|0⟩−1+i2|1⟩ and |ϕ⟩=2+i3|0⟩−2i3|1⟩. What is ⟨ψ|ϕ⟩?
Quantum Physics - Thanks Tiger and this is Matrix!, Monday, March 18, 2013 at 6:38pm
ZX 4x4 matrix:
0100
1000
000-1
00-10
Quantum Physics - THANKS YOU KNOW THIS?, Monday, March 18, 2013 at 6:52pm
ANSWERS TO QUESTIONS 1,9,14?
Quantum Physics - TIGER, Monday, March 18, 2013 at 7:02pm
I calculated this for the Q1:
(2+i+i^2)/6
But is not OK! some suggestion?
Quantum Physics - TIGER, Monday, March 18, 2013 at 7:12pm
I calculated this for the Q1:
(2+i+i^2)/6
But is not OK! some suggestion?
Quantum Physics - Anonymous, Monday, March 18, 2013 at 9:18pm
14d
Quantum Physics - TIGER, Monday, March 18, 2013 at 10:50pm
thks !! 9a... some help?Ą
Quantum Physics - Anonymous, Monday, March 18, 2013 at 10:52pm
Yes 9A?
Quantum Physics - Anonymous, Monday, March 18, 2013 at 10:52pm
Yes 9A?
Quantum Physics - TIGER, Monday, March 18, 2013 at 10:55pm
9b is 0.5
9a?????
and 1???
Quantum Physics - Maverick, Monday, March 18, 2013 at 11:01pm
Q1 is (3+5*i)/6

Down to my last entry on 9A???anyone?
Quantum Physics - TIGER, Monday, March 18, 2013 at 11:16pm
IM in the same situation.. is not:
0.5
neither
0.25
Probably 1?
Quantum Physics - SyLaR, Monday, March 18, 2013 at 11:16pm
9a is 1
Quantum Physics - SyLaR, Monday, March 18, 2013 at 11:16pm
9a is 1
Quantum Physics - TIGER, Monday, March 18, 2013 at 11:25pm
thank you!!! its correct...
Quantum Physics - Maverick, Monday, March 18, 2013 at 11:27pm
Arigato!
Quantum Physics - TIGER, Monday, March 18, 2013 at 11:57pm
Grazie!!
Quantum Physics - Anonymous, Tuesday, March 19, 2013 at 12:35am
number 1?
Quantum Physics - Anonymous, Tuesday, March 19, 2013 at 12:46am
number 1? and 3?

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