Suppressing phase damping decoherence by periodical imperfect projective measurements

Liu, Boyang; Zhang, Ming; Peng, Kang; Hirata, Dai

doi:10.1016/j.automatica.2018.03.045

Cited by 4 publications

(2 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[35−37] How to overcome phase damping decoherence by periodical imperfect projective measurements has also been explored recently. [38] To the best of our knowledge, how to simultaneously deal with model uncertainties and measurement perturbations, however, has not been studied so far. To a certain degree, this research generalizes the previous research [38] where model parameters are assumed to be known exactly.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Robust Set Stabilization and Its Instances for Open Quantum Systems

Zhang¹,

Xi²,

Tarn³

2018

Chinese Phys. Lett.

Self Cite

View full text Add to dashboard Cite

We propose and discuss a novel concept of robust set stabilization by permissible controls; this concept is helpful when dealing with both a priori information of model parameters and different permissible controls including quantum measurements. Both controllability and stabilization can be regarded as the special case of the novel concept. An instance is presented for a kind of uncertain open quantum systems to further justify this generalized concept. It is underlined that a new type of hybrid control based on periodically perturbed projective measurements can be the permissible control of uncertain open quantum systems when perturbed projective measurements are available. The sufficient conditions are given for the robust set stabilization of uncertain quantum open systems by the hybrid control, and the design of the hybrid control is reduced to selecting the period of measurements.

show abstract

mentioning

confidence: 99%

“…[43]. To a certain degree, a recent work [38] can be regarded as the special case of the instance in this research. In our opinion, we should further combine the elegant structural concepts with robustness ideas to deal with various uncertainties and perturbations.…”

mentioning

confidence: 99%

Robust Set Stabilization and Its Instances for Open Quantum Systems

Zhang¹,

Xi²,

Tarn³

2018

Chinese Phys. Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

Deterministic Quantum Controlled Teleportation of Arbitrary Multi-qubit States via Partially Entangled States

et al. 2018

View full text Add to dashboard Cite

Effects of time delay in no-knowledge quantum feedback control

Saiphet

Chantasri

Suwanna

2019

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The no-knowledge quantum feedback, introduced in Phys. Rev. Lett., 113, 020407 (2014), is a measurement-based feedback protocol for decoherence suppression in a quantum system coupled to noisy environment. By continuously measuring the environmental noise, without directly gathering any information about the system, the decoherence effect can be suppressed by feeding back quantum controls proportional to the measured signal. In the original work, the feedback control was assumed instantaneous, leading to perfect cancellation of noise backaction on the quantum system. However, the instantaneous feedback is difficult to achieve in practice, and close-loop feedback protocols are always associated with finite delayed time. Therefore, in this work, we consider the effects of the delay between the time at which the measurement signal is acquired and the time that such signal is fed back to the system. We investigate the problem with an example of a two-level system (qubit) coupled to a Markovian reservoir, via a Hermitian coupling operator, where a homodyne detection is used to measure the environmental noise. We numerically simulate quantum stochastic trajectories of the qubit and analyse their averaged dynamics. We find that the feedback control with time delay can either enhance or reduce the decoherence effects, depending on whether the delayed time is in-phase or out-of-phase with the unitary dynamics of the qubit system.

show abstract

Suppressing phase damping decoherence by periodical imperfect projective measurements

Cited by 4 publications

References 50 publications

Robust Set Stabilization and Its Instances for Open Quantum Systems

Robust Set Stabilization and Its Instances for Open Quantum Systems

Deterministic Quantum Controlled Teleportation of Arbitrary Multi-qubit States via Partially Entangled States

Effects of time delay in no-knowledge quantum feedback control

Contact Info

Product

Resources

About