|
45 | 45 | None, |
46 | 46 | 'possible-paths-for-project-2'), |
47 | 47 | ('Overarching motivation', 2, None, 'overarching-motivation'), |
| 48 | + ('Quantum Fourier Transforms (QFTs)', |
| 49 | + 2, |
| 50 | + None, |
| 51 | + 'quantum-fourier-transforms-qfts'), |
| 52 | + ('Why Quantum Fourier Transforms and exponential speedup', |
| 53 | + 2, |
| 54 | + None, |
| 55 | + 'why-quantum-fourier-transforms-and-exponential-speedup'), |
| 56 | + ('Quantum Fourier Transforms and quantum parallelism', |
| 57 | + 2, |
| 58 | + None, |
| 59 | + 'quantum-fourier-transforms-and-quantum-parallelism'), |
| 60 | + ('Quantum Fourier Transforms and implementation', |
| 61 | + 2, |
| 62 | + None, |
| 63 | + 'quantum-fourier-transforms-and-implementation'), |
| 64 | + ('Why Quantum Fourier Transforms? VI', |
| 65 | + 2, |
| 66 | + None, |
| 67 | + 'why-quantum-fourier-transforms-vi'), |
| 68 | + ('Why Quantum Fourier Transforms? I', |
| 69 | + 2, |
| 70 | + None, |
| 71 | + 'why-quantum-fourier-transforms-i'), |
48 | 72 | ('A familiar case', 2, None, 'a-familiar-case'), |
49 | 73 | ('Several driving forces', 2, None, 'several-driving-forces'), |
50 | 74 | ('Periodicity', 2, None, 'periodicity'), |
|
228 | 252 | <!-- navigation toc: --> <li><a href="#plans-for-the-week-of-march-24-28-2025" style="font-size: 80%;"><b>Plans for the week of March 24-28, 2025</b></a></li> |
229 | 253 | <!-- navigation toc: --> <li><a href="#possible-paths-for-project-2" style="font-size: 80%;"><b>Possible paths for project 2</b></a></li> |
230 | 254 | <!-- navigation toc: --> <li><a href="#overarching-motivation" style="font-size: 80%;"><b>Overarching motivation</b></a></li> |
| 255 | + <!-- navigation toc: --> <li><a href="#quantum-fourier-transforms-qfts" style="font-size: 80%;"><b>Quantum Fourier Transforms (QFTs)</b></a></li> |
| 256 | + <!-- navigation toc: --> <li><a href="#why-quantum-fourier-transforms-and-exponential-speedup" style="font-size: 80%;"><b>Why Quantum Fourier Transforms and exponential speedup</b></a></li> |
| 257 | + <!-- navigation toc: --> <li><a href="#quantum-fourier-transforms-and-quantum-parallelism" style="font-size: 80%;"><b>Quantum Fourier Transforms and quantum parallelism</b></a></li> |
| 258 | + <!-- navigation toc: --> <li><a href="#quantum-fourier-transforms-and-implementation" style="font-size: 80%;"><b>Quantum Fourier Transforms and implementation</b></a></li> |
| 259 | + <!-- navigation toc: --> <li><a href="#why-quantum-fourier-transforms-vi" style="font-size: 80%;"><b>Why Quantum Fourier Transforms? VI</b></a></li> |
| 260 | + <!-- navigation toc: --> <li><a href="#why-quantum-fourier-transforms-i" style="font-size: 80%;"><b>Why Quantum Fourier Transforms? I</b></a></li> |
231 | 261 | <!-- navigation toc: --> <li><a href="#a-familiar-case" style="font-size: 80%;"><b>A familiar case</b></a></li> |
232 | 262 | <!-- navigation toc: --> <li><a href="#several-driving-forces" style="font-size: 80%;"><b>Several driving forces</b></a></li> |
233 | 263 | <!-- navigation toc: --> <li><a href="#periodicity" style="font-size: 80%;"><b>Periodicity</b></a></li> |
@@ -392,6 +422,45 @@ <h2 id="overarching-motivation" class="anchor">Overarching motivation </h2> |
392 | 422 | items. |
393 | 423 | </p> |
394 | 424 |
|
| 425 | +<!-- !split --> |
| 426 | +<h2 id="quantum-fourier-transforms-qfts" class="anchor">Quantum Fourier Transforms (QFTs) </h2> |
| 427 | +<ol> |
| 428 | +<li> QFTs are the quantum analogue of the Discrete Fourier Transforms (DFTs).</li> |
| 429 | +<li> They play a crucial role in quantum algorithms like Shor’s Algorithm and Quantum Phase Estimation.</li> |
| 430 | +<li> QFTs provide an <em>exponential speedup</em> over classical Fourier Transform methods.</li> |
| 431 | +</ol> |
| 432 | +<!-- !split --> |
| 433 | +<h2 id="why-quantum-fourier-transforms-and-exponential-speedup" class="anchor">Why Quantum Fourier Transforms and exponential speedup </h2> |
| 434 | +<ol> |
| 435 | +<li> Classical Discrete Fourier Transforms (DFTs) require \( O(N^2) \) operations.</li> |
| 436 | +<li> The Fast Fourier Transform (FFT) improves this to \( O(N \log N) \) operations.</li> |
| 437 | +<li> QFTs reduce complexity to \( O((\log N)^2) \) using quantum gates.</li> |
| 438 | +</ol> |
| 439 | +<!-- !split --> |
| 440 | +<h2 id="quantum-fourier-transforms-and-quantum-parallelism" class="anchor">Quantum Fourier Transforms and quantum parallelism </h2> |
| 441 | + |
| 442 | +<ol> |
| 443 | +<li> QFTs acts on a <em>superposition</em> of states, processing all inputs simultaneously.</li> |
| 444 | +<li> This is crucial in algorithms like: |
| 445 | +<ol type="a"></li> |
| 446 | + <li> Shor’s Algorithm for factoring large numbers.</li> |
| 447 | + <li> Quantum Phase Estimation (QPE) for eigenvalue extraction.</li> |
| 448 | +</ol> |
| 449 | +</ol> |
| 450 | +<!-- !split --> |
| 451 | +<h2 id="quantum-fourier-transforms-and-implementation" class="anchor">Quantum Fourier Transforms and implementation </h2> |
| 452 | + |
| 453 | +<ol> |
| 454 | +<li> QFT requires only <em>Hadamard gates and controlled-phase gates</em>.</li> |
| 455 | +<li> A 3-qubit QFT circuit uses only \( O(n^2) \).</li> |
| 456 | +<li> This makes QFT highly efficient for <em>quantum hardware</em>.</li> |
| 457 | +</ol> |
| 458 | +<!-- !split --> |
| 459 | +<h2 id="why-quantum-fourier-transforms-vi" class="anchor">Why Quantum Fourier Transforms? VI </h2> |
| 460 | + |
| 461 | +<!-- !split --> |
| 462 | +<h2 id="why-quantum-fourier-transforms-i" class="anchor">Why Quantum Fourier Transforms? I </h2> |
| 463 | + |
395 | 464 | <!-- !split --> |
396 | 465 | <h2 id="a-familiar-case" class="anchor">A familiar case </h2> |
397 | 466 |
|
|
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