Detecting Measurement-Induced Entanglement Transitions with Unitary Mirror Circuits

被引:1
|
作者
Yanay, Yariv [1 ,2 ]
Swingle, Brian [3 ]
Tahan, Charles [2 ]
机构
[1] Lab Phys Sci, 8050 Greenmead Dr, College Pk, MD 20740 USA
[2] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[3] Brandeis Univ, Dept Phys, Waltham, MA 02453 USA
关键词
Coincidence circuits - Combinatorial circuits - Mirrors - Polynomial approximation - Q factor measurement - Quantum electronics - Quantum entanglement - Quantum optics - Random number generation - Tensors;
D O I
10.1103/PhysRevLett.133.070601
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Monitored random circuits, consisting of alternating layers of entangling two-qubit gates and projective single-qubit measurements applied to some fraction p of the qubits, have been a topic of recent interest. In particular, the resulting steady state exhibits a phase transition from highly correlated states with "volume- law" entanglement at p < p(c) to localized states with "area-law" entanglement at p > p(c). It is hard to access this transition experimentally, as it cannot be seen at the ensemble level. Naively, to observe it one must repeat the experiment until the set of measurement results repeats itself, with likelihood that is exponentially small in the number of measurements. To overcome this issue, we present a hybrid quantum- classical algorithm which creates a matrix product state (MPS) based "unitary mirror" of the projected circuit. Polynomial-sized tensor networks can represent quantum states with area-law entanglement, and so the unitary mirror can well approximate the experimental state above p(c) but fails exponentially below it. The breaking of this mirror can thus pinpoint the critical point. We outline the algorithm and how such results would be obtained. We present a bound on the maximum entanglement entropy of any given state that is well represented by an MPS, and from the bound suggest how the volume-law phase can be bounded. We consider whether the entanglement could similarly be bounded from below where the MPS fails. Finally, we present numerical results for small qubit numbers and for monitored circuits with random Clifford gates.
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页数:5
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