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Simulating partially entangled qubits with one bit of communication

Decide whether shared randomness and one bit of communication reproduce all projective measurements on every partially entangled qubit pair.

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1{
2 "domain": "physics-astronomy",
3 "topics": [
4 "quantum-information"
5 ],
6 "type": "construction",
7 "also": [
8 "proof"
9 ],
10 "source": {
11 "key": "qiqcop",
12 "name": "QIQCOP Zoo",
13 "url": "https://qiqc-op.com/problem/op_64db785888803dd3/",
14 "id": "op_64db785888803dd3",
15 "curator": "Bikun Li, Qicheng Tang, Changhao Li, Chengkai Zhu, Minbo Gao, Zhong-Xia Shang, Bin Cheng and Naixu Guo",
16 "poser": "Nicolas Gisin (2007)",
17 "status": "unsolved",
18 "as_of": "2026-10-20",
19 "catalog": "0521c19bbd38"
20 },
21 "review": true,
22 "approval": "first-time"
23}