Undoing a quantum measurement

Abstract

In general, a quantum measurement yields an undetermined answer and alters the system to be consistent with the measurement result. This process maps multiple initial states into a single state and thus cannot be reversed. This has important implications in quantum information processing, where errors can be interpreted as measurements. Therefore, it seems that it is impossible to correct errors in a quantum information processor, but protocols exist that are capable of eliminating them if they affect only part of the system. In this work we present the deterministic reversal of a fully projective measurement on a single particle, enabled by a quantum error-correction protocol that distributes the information over three particles.

References in corpus (2)

• Optimal control of entangling operations for trapped ion quantum computing
• Reversal of Photon-Scattering Errors in Atomic Qubits

Cited by in corpus (15)

• Quantum information processing with superconducting circuits: a review
• A quantum information processor with trapped ions
• Rydberg blockade, Förster resonances, and quantum state measurements with different atomic species
• Reversing quantum trajectories with analog feedback
• Using Spontaneous Emission of a Qubit as a Resource for Feedback Control
• Experimental recovery of a qubit from partial collapse
• Practical method to obtain a lower bound to the three-tangle
• Global triplewise information trade-off in quantum measurement
• Linear feedback stabilization of a dispersively monitored qubit
• Complete Information Balance in Quantum Measurement
• An energy-resolved atomic scanning probe
• Effect of weak measurement on entanglement distribution over noisy channels
• A Resilient Quantum Secret Sharing Scheme
• Measurement-Induced Heating of Trapped Ions
• Experimental realization of optimal time-reversal on an atom chip for quantum undo operations