Using Polarons for sub-nK Quantum Nondemolition Thermometry in a Bose-Einstein Condensate.

@article{Mehboudi2019UsingPF,
  title={Using Polarons for sub-nK Quantum Nondemolition Thermometry in a Bose-Einstein Condensate.},
  author={Mohammad Mehboudi and Aniello Lampo and Christos Charalambous and Luis A. Correa and Miguel Angel Garcia-March and Maciej Lewenstein},
  journal={Physical review letters},
  year={2019},
  volume={122 3},
  pages={
          030403
        }
}
We introduce a novel minimally disturbing method for sub-nK thermometry in a Bose-Einstein condensate (BEC). Our technique is based on the Bose polaron model; namely, an impurity embedded in the BEC acts as the thermometer. We propose to detect temperature fluctuations from measurements of the position and momentum of the impurity. Crucially, these cause minimal backaction on the BEC and hence, realize a nondemolition temperature measurement. Following the paradigm of the emerging field of… 

Figures from this paper

In Situ Thermometry of a Cold Fermi Gas via Dephasing Impurities.
TLDR
This work demonstrates that the temperature of a noninteracting Fermi gas can be accurately inferred from the nonequilibrium dynamics of impurities immersed within it, using an interferometric protocol and established experimental methods.
Bath-Induced Correlations Enhance Thermometry Precision at Low Temperatures.
We study the role of bath-induced correlations in temperature estimation of cold bosonic baths. Our protocol includes multiple probes, that are not interacting, nor are they initially correlated to
Quantum dynamics of a Bose polaron in a d -dimensional Bose-Einstein condensate
We study the quantum motion of an impurity atom immersed in a Bose-Einstein condensate in arbitrary dimensions. It was shown, for all dimensions, that the Bogoliubov excitations of the Bose-Einstein
Collisional Quantum Thermometry.
TLDR
This work shows through a minimal qubit model that individual ancillas can already outperform the thermal Cramer-Rao bound, and sets forth the notion of metrology in a sequential interactions setting, and may inspire further advances in quantum thermometry.
Optimal temperature estimation in polariton Bose-Einstein Condensate
Improving the measurement precision of temperature is very important and challenging, especially in the low temperature range. Based on the existence of invariant subspaces during the polariton
Bose-Einstein-condensate fluctuations versus an interparticle interaction
We calculate the Bose-Einstein condensate (BEC) occupation statistics vs. the interparticle interaction in a dilute gas with a nonuniform condensate in a box trap within the Bogoliubov approach. The
Coherent and dephasing spectroscopy for single-impurity probing of an ultracold bath
We report Ramsey spectroscopy on the clock states of individual Cs impurities immersed in an ultracold Rb bath. We record both the interaction-driven phase evolution and the decay of fringe contrast
Non-Markovian Quantum Thermometry
The rapidly developing quantum technologies and thermodynamics have put forward a require-ment to precisely control and measure the temperature of microscopic matter at the quantum level. Many
Single-Atom Quantum Probes for Ultracold Gases Boosted by Nonequilibrium Spin Dynamics
Quantum probes are atomic-sized devices mapping information of their environment to quantum mechanical states. By improving measurements and at the same time minimizing perturbation of the
Optimal cold atom thermometry using adaptive Bayesian strategies
Precise temperature measurements on systems of few ultracold atoms is of paramount importance in quantum technology, but can be very resource-intensive. Here, we put forward an adaptive Bayesian
...
...

References

SHOWING 1-10 OF 90 REFERENCES
Impurities as a quantum thermometer for a Bose-Einstein condensate
TLDR
A primary thermometer which measures the temperature of a Bose-Einstein Condensate in the sub-nK regime is introduced and it is shown that the highest precision is achieved when the phase is dynamical rather than geometric and when it is detected through Ramsey interferometry.
Thermometry and cooling of a Bose-Einstein condensate to 0.02 times the critical temperature
Ultracold gases promise access to many-body quantum phenomena at convenient length and time scales. However, it is unclear whether the entropy of these gases is low enough to realize many phenomena
A primary noise thermometer for ultracold Bose gases
We discuss in detail the experimental investigation of thermally induced fluctuations of the relative phase between two weakly coupled Bose–Einstein condensates (BECs). In analogy to superconducting
Universality of an impurity in a Bose-Einstein condensate
Universality is a powerful concept in physics, allowing one to construct physical descriptions of systems that are independent of the precise microscopic details or energy scales. A prime example is
Enhancement of low-temperature thermometry by strong coupling
We consider the problem of estimating the temperature T of a very cold equilibrium sample. The temperature estimates are drawn from measurements performed on a quantum Brownian probe strongly coupled
Measuring the temperature of cold many-body quantum systems
It is "conventional wisdom" that the uncertainty of local temperature measurements on equilibrium systems diverges exponentially fast as their temperature $T$ drops to zero. In contrast, some exactly
Bose polaron as an instance of quantum Brownian motion
We study the dynamics of a quantum impurity immersed in a Bose-Einstein condensate as an open quantum system in the framework of the quantum Brownian motion model. We derive a generalized Langevin
Quantum metrology from a quantum information science perspective
We summarize important recent advances in quantum metrology, in connection to experiments in cold gases, trapped cold atoms and photons. First we review simple metrological setups, such as quantum
Noise thermometry with two weakly coupled Bose-Einstein condensates.
TLDR
It is confirmed that the heat capacity of an ideal Bose gas deviates from that of a classical gas as predicted by the third law of thermodynamics.
Few-fermion thermometry
Potential realization of a quantum thermometer operating in the nanokelvin regime, formed by a few-fermionic mixture confined in a one-dimensional harmonic trap, is proposed. Thermal states of the
...
...