Pulsed Quantum-State Reconstruction of Dark Systems
arXiv:1901.11232 · doi:10.1103/PhysRevLett.122.110406
Abstract
We propose a novel strategy to reconstruct the quantum state of dark systems, i.e., degrees of freedom that are not directly accessible for measurement or control. Our scheme relies on the quantum control of a two-level probe that exerts a state-dependent potential on the dark system. Using a sequence of control pulses applied to the probe makes it possible to tailor the information one can obtain and, for example, allows us to reconstruct the density operator of a dark spin as well as the Wigner characteristic function of a harmonic oscillator. Because of the symmetry of the applied pulse sequence, this scheme is robust against slow noise on the probe. The proof-of-principle experiments are readily feasible in solid-state spins and trapped ions.
11 pages, 6 figures
References in corpus (20)
- Quantum Computing
- Single-shot read-out of an individual electron spin in a quantum dot
- Atom Interferometers
- Universal dynamical decoupling of a single solid-state spin from a spin bath
- Reconstruction of non-classical cavity field states with snapshots of their decoherence
- Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
- Extending Quantum Coherence in Diamond
- Detection and control of individual nuclear spins using a weakly coupled electron spin
- Individual quantum probes for optimal thermometry
- Dynamical Decoupling of a single electron spin at room temperature
- Single-spin magnetometry with multi-pulse sensing sequences
- Observation of Lee-Yang zeros
- Nuclear spin pair coherence in diamond for atomic scale magnetometry
- Ultrafast Gates for Single Atomic Qubits
- Individual addressing of trapped ions and coupling of motional and spin states using rf radiation
- Control and coherence of the optical transition of single defect centers in diamond
- Lossless State Detection of Single Neutral Atoms
- Indirect Quantum Tomography of Quadratic Hamiltonians
- Hamiltonian identifiability assisted by single-probe measurement
- Wigner Function Reconstruction in Levitated Optomechanics