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Experimental Demonstration of Universal Quantum Cloning in a Circuit | | Zhen-Biao Yang
; Pei-Rong Han
; Xin-Jie Huang
; Wen Ning
; HekangLi
; Kai Xu
; Dongning Zheng
; Heng Fan
; Shi-Biao Zheng
; | | Date: |
7 Sep 2019 | | Abstract: | No-cloning theorem forbids perfect cloning of an unknown quantum state. A
universal quantum cloning machine (UQCM), which can produce two copies of any
input qubit with the optimal fidelity, is of fundamental interest and has
applications in quantum information processing. Previous implementations of
UQCMs either are probabilistic or do not constitute true cloning of individual
qubits. We here report on the first deterministic experimental demonstration of
the UQCM for genuinely individual qubits in a superconducting circuit, where
five Xmon qubits are coupled to a bus resonator. The high controllability of
the system dynamics, enabled by the frequency tunability of each qubit, allows
for deterministic implementation of all gate operations necessary for
approximately cloning an arbitrary input state. The measured fidelities of the
clones are input-state-independent and close to the optimal value 5/6. We
further confirm the existence of quantum entanglement among the two clones and
the original qubits, which distinguishes a quantum cloning machine from a
classical counterpart but has not been demonstrated yet. | | Source: | arXiv, 1909.3170 | | Services: | Forum | Review | PDF | Favorites | |
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