Directly measuring a multiparticle quantum wave function via quantum teleportation

Ming-Cheng Chen, Yuan Li, Run-Ze Liu, Dian Wu, Zu-En Su, Xi-Lin Wang, Li Li, Nai-Le Liu, Chao-Yang Lu, Jian-Wei Pan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)

Abstract

We propose a new method to directly measure a general multiparticle quantum wave function, a single matrix element in a multi-particle density matrix, by quantum teleportation. The density matrix element is embedded in a virtual logical qubit and is nondestructively teleported to a single physical qubit for readout. We experimentally implement this method to directly measure the wave function of a photonic mixed quantum state beyond a single photon using a single observable for the first time. Our method also provides an exponential advantage over the standard quantum state tomography in measurement complexity to fully characterize a sparse multiparticle quantum state.
Original languageEnglish
Pages (from-to)030402
Number of pages1
JournalPhysical Review Letters
Volume127
Issue number3
Publication statusPublished - 2021

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