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   <div id="readme" class="Box-body readme blob js-code-block-container px-5">    <article class="markdown-body entry-content" itemprop="text">So to start of the challenge we take a look at the instructions page andsee the definitions for this random secret gate of theirs.Since I have worked we these kinds of gates before I see that the definitionsclosely resemble that of the gate used for a Deutsch algorithm.This is a algorithm that is used to minimize function calls to tellwhether a function is balanced or constant. The algorithm uses a auxiliaryqubit which is our second qubit in the  state. Both qubits are then broughtinto superposition using two hadamards and the unitary gate  is applied across the twoqubits. The first qubit is then brought back to a single state using another hadamard.In the case of Deutsch reading the first qubit then gives us the function calls which is completely equal to .Thus xor'ing these two possible function calls is given byWhere the first term will always be zero thusSo depending on the outcome of the first qubit we can find . If the outcome is0 then  is also 0 and the same for the outcome of 1.Now the trouble was that we are only given a specific  and we would really like all of .This part is probably obvious to most but it took me a while to figure out. I discovered afterusing Chrome's dev tools and looking around for a bit, that we get one cookie named "randomness"which is set to a specific numeric value. I figured that this is probably used to set the valuefor . So I wrote up a script in python (Babyquantum.py in rep) using selenium passed the circuit from Deutsch as- H U1 H DX H U2 H Dand went through the values 0-200 for the cookie, reading the output of the first qubit.this gave me a binary.10000010 00110010 00110010 10100010 11001010 1101111011001110 11000110 00010110 01001110 11110110 1010011000100110 10010110 01110110 11100110 10100110 0100111011001110 11111010 01000110 10000110 01000110 1001111010111110Which again I looked at for quite a while not able to make sense of it.I finally figured that since nothing else was given the flag probably hadALLES in the start, which almost fit with what I had, Mathing up the lettersI realized that the binary string was flipped. Thus after flipping and convertingto ascii I got a flipped string which I again flipped giving the flagALLES{schroedingers_baby}</article>  </div>
So to start of the challenge we take a look at the instructions page andsee the definitions for this random secret gate of theirs.


Since I have worked we these kinds of gates before I see that the definitionsclosely resemble that of the gate used for a Deutsch algorithm.This is a algorithm that is used to minimize function calls to tellwhether a function is balanced or constant. The algorithm uses a auxiliaryqubit which is our second qubit in the  state. Both qubits are then broughtinto superposition using two hadamards and the unitary gate  is applied across the twoqubits. The first qubit is then brought back to a single state using another hadamard.In the case of Deutsch reading the first qubit then gives us the function calls which is completely equal to .
Thus xor'ing these two possible function calls is given by


Where the first term will always be zero thus

So depending on the outcome of the first qubit we can find . If the outcome is0 then  is also 0 and the same for the outcome of 1.
Now the trouble was that we are only given a specific  and we would really like all of .This part is probably obvious to most but it took me a while to figure out. I discovered afterusing Chrome's dev tools and looking around for a bit, that we get one cookie named "randomness"which is set to a specific numeric value. I figured that this is probably used to set the valuefor . So I wrote up a script in python (Babyquantum.py in rep) using selenium passed the circuit from Deutsch as
- H U1 H D
X H U2 H D
and went through the values 0-200 for the cookie, reading the output of the first qubit.this gave me a binary.
10000010 00110010 00110010 10100010 11001010 1101111011001110 11000110 00010110 01001110 11110110 1010011000100110 10010110 01110110 11100110 10100110 0100111011001110 11111010 01000110 10000110 01000110 1001111010111110
Which again I looked at for quite a while not able to make sense of it.I finally figured that since nothing else was given the flag probably hadALLES in the start, which almost fit with what I had, Mathing up the lettersI realized that the binary string was flipped. Thus after flipping and convertingto ascii I got a flipped string which I again flipped giving the flag
ALLES{schroedingers_baby}
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