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Here is A0 again, followed by the six possibilities when one of its qubits is p-measured:
Qureg A0
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State | Amplitude | Probability
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│000 〉 | +0.32272 − 0.12294i | 0.11926
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│001 〉 | −0.16136 + 0.03074i | 0.02698
|
│010 〉 | −0.17673 − 0.19210i | 0.06813
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│011 〉 | +0.25645 + 0.11105i | 0.07810
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│100 〉 | +0.07684 + 0.39188i | 0.15947
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│101 〉 | +0.22712 − 0.18991i | 0.08765
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│110 〉 | +0.57598 − 0.25131i | 0.39490
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│111 〉 | +0.23749 + 0.09535i | 0.06549
|
naïve = 0.66390
|
p-measuring the first bit gives one of these:
Qureg A6
|
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State | Amplitude | Probability
|
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│000 〉 | +0.59673 − 0.22733i | 0.40777
| │001 〉 | −0.29837 + 0.05683i | 0.09225
| │010 〉 | −0.32678 − 0.35520i | 0.23295
| │011 〉 | +0.47419 + 0.20534i | 0.26702
| │100 〉 | 0 | 0
| │101 〉 | 0 | 0
| │110 〉 | 0 | 0
| │111 〉 | 0 | 0
| naïve = 0.31688
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Qureg A7
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State | Amplitude | Probability
|
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│000 〉 | 0 | 0
| │001 〉 | 0 | 0
| │010 〉 | 0 | 0
| │011 〉 | 0 | 0
| │100 〉 | +0.09135 + 0.46589i | 0.22539
| │101 〉 | +0.27002 − 0.22578i | 0.12389
| │110 〉 | +0.68476 − 0.29877i | 0.55815
| │111 〉 | +0.28234 + 0.11336i | 0.09257
| naïve = 0.57119
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p-measuring the second bit gives one of these:
Qureg A8
|
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State | Amplitude | Probability
|
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│000 〉 | +0.51455 − 0.19602i | 0.30319
| │001 〉 | −0.25728 + 0.04900i | 0.06859
| │010 〉 | 0 | 0
| │011 〉 | 0 | 0
| │100 〉 | +0.12251 + 0.62481i | 0.40540
| │101 〉 | +0.36213 − 0.30280i | 0.22282
| │110 〉 | 0 | 0
| │111 〉 | 0 | 0
| naïve = 0.28620
|
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Qureg A9
|
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State | Amplitude | Probability
|
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│000 〉 | 0 | 0
| │001 〉 | 0 | 0
| │010 〉 | −0.22691 − 0.24664i | 0.11232
| │011 〉 | +0.32926 + 0.14258i | 0.12874
| │100 〉 | 0 | 0
| │101 〉 | 0 | 0
| │110 〉 | +0.73951 − 0.32266i | 0.65098
| │111 〉 | +0.30492 + 0.12242i | 0.10796
| naïve = 0.48651
|
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p-measuring the third bit gives one of these:
Qureg A10
|
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State | Amplitude | Probability
|
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│000 〉 | +0.37471 − 0.14275i | 0.16078
| │001 〉 | 0 | 0
| │010 〉 | −0.20520 − 0.22304i | 0.09185
| │011 〉 | 0 | 0
| │100 〉 | +0.08922 + 0.45500i | 0.21499
| │101 〉 | 0 | 0
| │110 〉 | +0.66876 − 0.29179i | 0.53238
| │111 〉 | 0 | 0
| naïve = 0.21997
|
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Qureg A11
|
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State | Amplitude | Probability
|
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│000 〉 | 0 | 0
| │001 〉 | −0.31754 + 0.06048i | 0.10449
| │010 〉 | 0 | 0
| │011 〉 | +0.50466 + 0.21853i | 0.30244
| │100 〉 | 0 | 0
| │101 〉 | +0.44695 − 0.37373i | 0.33944
| │110 〉 | 0 | 0
| │111 〉 | +0.46736 + 0.18764i | 0.25363
| naïve = 0.66578
|
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Entanglement can increase when bits are p-measured, because nonvanishing amplitudes are scaled up to restore the total probability to unity.