# Perfect Zeno-like effect through imperfect measurements at a finite frequency

@article{Layden2015PerfectZE, title={Perfect Zeno-like effect through imperfect measurements at a finite frequency}, author={David Layden and Eduardo Mart{\'i}n-Mart{\'i}nez and Achim Kempf}, journal={Physical Review A}, year={2015}, volume={91}, pages={022106} }

The quantum Zeno effect is usually thought to require infinitely frequent and perfect projective measurements to freeze the dynamics of quantum states. We show that perfect freezing of quantum states can also be achieved by more realistic nonprojective measurements performed at a finite frequency.

## Figures from this paper

## 18 Citations

Quantum Zeno effect by incomplete measurements

- Computer Science, PhysicsQuantum Inf. Process.
- 2019

It is shown that an efficient freeze of the quantum state by incomplete measurements is available and interestingly, this state freeze can be more significant than that obtained in the complete measurement case if the parameters of incomplete measurements are properly set.

Quantum Quasi-Zeno Dynamics: Transitions mediated by frequent projective measurements near the Zeno regime

- Physics
- 2016

Frequent observation of a quantum system leads to quantum Zeno physics, where the system evolution is constrained to states commensurate with the measurement outcome. We show that, more generally,…

Quantum Zeno Effect and Atomic Population Inversion

- Physics
- 2018

Quantum Zeno effect can be applied to quantum information processing，and can reveal the nature of quantum measurement. In addition, it has also many potential applications. This suggests that…

Quantum Zeno and Zeno-like effects in nitrogen vacancy centers

- Physics, MedicineScientific reports
- 2015

Under the practical experimental conditions, the calculations show that there exist both QZE and QZLE in a 13C nuclear spin in the vicinity of an NV center.

Universal scheme for indirect quantum control

- Physics, Mathematics
- 2016

We consider a bipartite quantum object, composed of a quantum system and a quantum actuator which is periodically reset. We show that the reduced dynamics of the system approaches unitarity as the…

Indirect Quantum Control: An Implementation-Independent Scheme

- Physics
- 2016

The ability to control quantum systems rapidly as compared to their coherence times is a central requirement for most proposed quantum technologies, such as quantum computing and quantum metrology.…

Protecting quantum entanglement and correlation by local filtering operations

- Physics, Computer ScienceQuantum Inf. Process.
- 2016

In this work, the protection of different quantum entanglement and correlation is explored by local filtering operations. The results show that the filtering operations can indeed be useful for…

Topics in quantum measurement of many-body systems

- Physics
- 2016

In quantum physics, measurement exhibits fundamentally different behaviour to the classical case, having direct effect on the observed system. As a result, the very act of observation in quantum…

Quantum Zeno Effects and the Entanglement of JC Model

- 2016

In the field-atom interaction system, the relation between the frequently-repeated measurement and the entanglement of the field-atom is investigated within Jaynes-Cummings (JC) model. Numerical…

Quantum Zeno effect in a nitrogen-vacancy center embedded in a spin bath

- Physics
- 2016

We study the longitudinal relaxation of a nitrogen-vacancy (NV) center surrounded by a $^{13}$C nuclear spin bath in diamond. By means of cluster-correlation expansion (CCE), we numerically…

## References

SHOWING 1-10 OF 53 REFERENCES

Quantum Zeno subspaces.

- Physics, MedicinePhysical review letters
- 2002

The quantum Zeno effect is recast in terms of an adiabatic theorem when the measurement is described as the dynamical coupling to another quantum system that plays the role of apparatus. A few…

Zeno effect for quantum computation and control.

- Physics, MedicinePhysical review letters
- 2012

This work derives rigorous performance bounds which demonstrate that the Zeno effect can be used to protect appropriately encoded arbitrary states to arbitrary accuracy while at the same time allowing for universal quantum computation or quantum control.

Purification through Zeno-like measurements.

- Physics, MedicinePhysical review letters
- 2003

A series of frequent measurements on a quantum system (Zeno-like measurements) is shown to result in the "purification" of another quantum system in interaction with the former. Even though the…

Observation of the quantum zeno and anti-zeno effects in an unstable system

- Physics, MedicineTechnical Digest. Summaries of papers presented at the Quantum Electronics and Laser Science Conference. Postconference Technical Digest (IEEE Cat. No.01CH37172)
- 2001

It is found that the tunneling dynamics are strongly affected by repeated measurement during the non-exponential time, leading to either inhibition (zeno) or enhancement (anti-zenO) of decay.

Quantum zeno effect

- Physics
- 1990

Misra and Sudarshan pointed out, based on the quantum measurement theory, that repeated measurements lead to a slowing down of the transition, which they called the quantum Zeno effect. Recently,…

Quantum computing using dissipation to remain in a decoherence-free subspace

- Physics, MedicinePhysical review letters
- 2000

A new approach to the implementation of quantum gates is proposed in which decoherence during the gate operations is strongly reduced by making use of an environment induced quantum Zeno effect that confines the dynamics effectively to a decoherent-free subspace.

Incomplete "collapse" and partial quantum Zeno effect.

- Physics, MedicinePhysical review. A, Atomic, molecular, and optical physics
- 1990

If the interaction generating a quantum measurement is too weak to completely ``collapse'' the wave function, a partial quantum Zeno effect may result. An experimental test is proposed.

Quantum computing using single photons and the Zeno effect

- Physics
- 2004

We show that the quantum Zeno effect can be used to suppress the failure events that would otherwise occur in a linear optics approach to quantum computing. From a practical viewpoint, that would…

Protecting entanglement via the quantum Zeno effect.

- Medicine, PhysicsPhysical review letters
- 2008

It is shown that in the strong coupling regime the system-reservoir correlations induce entanglement revivals and oscillations and a strategy to fight against the deterioration of theEntanglement using the quantum Zeno effect is proposed.

Quantum entanglement via two-qubit quantum Zeno dynamics

- Physics
- 2008

We study the two-particle quantum Zeno dynamics with a type of nondeterministic collective measurement whose outcome indicates whether the two-particle state has been collapsed to 11. Such a…