Path-Independent Quantum Gates with Noisy Ancilla

Wen-Long Ma, Mengzhen Zhang, Yat Wong, Kyungjoo Noh, Serge Rosenblum, Philip Reinhold, Robert J. Schoelkopf, Liang Jiang

Research output: Contribution to journalArticlepeer-review


Ancilla systems are often indispensable to universal control of a nearly isolated quantum system. However, ancilla systems are typically more vulnerable to environmental noise, which limits the performance of such ancilla-assisted quantum control. To address this challenge of ancilla-induced decoherence, we propose a general framework that integrates quantum control and quantum error correction, so that we can achieve robust quantum gates resilient to ancilla noise. We introduce the path independence criterion for fault-tolerant quantum gates against ancilla errors. As an example, a path-independent gate is provided for superconducting circuits with a hardware-efficient design.

Original languageEnglish
Article number110503
Number of pages7
JournalPhysical review letters
Issue number11
StatePublished - 9 Sep 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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