期刊
PHYSICAL REVIEW LETTERS
卷 128, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.150504
关键词
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资金
- NSF Convergence Accelerator Track C Grant
- OIA [2040549]
The ability to selectively measure, initialize, and reuse qubits during a quantum circuit allows for significant resource savings when simulating quantum systems with limited entanglement. This approach conveniently encodes the entanglement structure of an infinite system within a small register of bond qubits and can be easily extracted.
The ability to selectively measure, initialize, and reuse qubits during a quantum circuit enables a mapping of the spatial structure of certain tensor-network states onto the dynamics of quantum circuits, thereby achieving dramatic resource savings when simulating quantum systems with limited entanglement. We experimentally demonstrate a significant benefit of this approach to quantum simulation: the entanglement structure of an infinite system-specifically the half-chain entanglement spectrum-is conveniently encoded within a small register of bond qubits and can be extracted with relative ease. Using Honeywell's model H0 quantum computer equipped with selective midcircuit measurement and reset, we quantitatively determine the near-critical entanglement entropy of a correlated spin chain directly in the thermodynamic limit and show that its phase transition becomes quickly resolved upon expanding the bond-qubit register.
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