Directly Measuring a Multiparticle Quantum Wave Function via Quantum Teleportation
arXiv:2107.11754 · doi:10.1103/PhysRevLett.127.030402
Abstract
We propose a new method to directly measure a general multi-particle 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 wavefunction 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 multi-particle quantum state.
arXiv comment5 pages, 4 figures
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- Reconstructing the multiphoton spatial wave function with coincidence wavefront sensing
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