11 research outputs found
A Hybrid Long-Distance Entanglement Distribution Protocol
We propose a hybrid (continuous-discrete variable) quantum repeater protocol
for distribution of entanglement over long distances. Starting from entangled
states created by means of single-photon detection, we show how entangled
coherent state superpositions, also known as `Schr\"odinger cat states', can be
generated by means of homodyne detection of light. We show that
near-deterministic entanglement swapping with such states is possible using
only linear optics and homodyne detectors, and we evaluate the performance of
our protocol combining these elements.Comment: 4 pages, 3 figure
Proposal for a long-distance nonlocality test with entanglement swapping and displacement-based measurements
We analyze an all-optical setup which enables Bell-inequality violation over long distances by exploiting probabilistic entanglement swapping. The setup involves only two-mode squeezers, displacements, beamsplitters, and on-off detectors. We describe how events must be arranged to close both the detection and locality loopholes. We analyze a scenario with dichotomic inputs and outputs, and check the robustness of the Bell inequality violation for up to six parties, with respect to phase, amplitude, and dark count noise, as well as loss.</p
Bayesian quantum thermometry based on thermodynamic length
In this work, we propose a theory of temperature estimation of quantum
systems, which is applicable in the regime of non-negligible prior temperature
uncertainty and limited measurement data. In this regime the problem of
establishing a well-defined measure of estimation precision becomes
non-trivial, and furthermore the construction of a suitable criterion for
optimal measurement design must be re-examined to account for the prior
uncertainty. We propose a fully Bayesian approach to temperature estimation
based on the concept of thermodynamic length, which solves both these problems.
As an illustration of this framework, we consider thermal spin- particles
and investigate the fundamental difference between two cases; on the one hand,
when the spins are probing the temperature of a heat reservoir and, on the
other, when the spins themselves constitute the sample.Comment: 12 pages, 5 figures, published versio
Quantum repeater using two-mode squeezed states and atomic noiseless amplifiers
We perform a theoretical investigation into how a two-mode squeezed vacuum state, which has undergone photon loss, can be stored and purified using noiseless amplification with a collection of solid-state qubits. The proposed method may be used to probabilistically increase the entanglement between the two parties sharing the state. The proposed amplification step is similar in structure to a set of quantum scissors. However, in this work the amplification step is realized by a state transfer from an optical mode to a set of solid-state qubits, which act as a quantum memory. We explore two different applications, the generation of entangled many-qubit registers and the construction of quantum repeaters for long-distance quantum key distribution.</p
Tight bound on finite-resolution quantum thermometry at low temperatures
Precise thermometry is of wide importance in science and technology in
general and in quantum systems in particular. Here, we investigate fundamental
precision limits for thermometry on cold quantum systems, taking into account
constraints due to finite measurement resolution. We derive a tight bound on
the optimal precision scaling with temperature, as the temperature approaches
zero. The bound can be saturated by monitoring the non-equilibrium dynamics of
a single-qubit probe. We support this finding by accurate numerical simulations
of a spin-boson model. Our results are relevant both fundamentally, as they
illuminate the ultimate limits to quantum thermometry, and practically, in
guiding the development of sensitive thermometric techniques applicable at
ultracold temperatures.Comment: 10+3 pages, 3 figure
Fundamental Limits in Bayesian Thermometry and Attainability via Adaptive Strategies
We investigate the limits of thermometry using quantum probes at thermal
equilibrium within the Bayesian approach. We consider the possibility of
engineering interactions between the probes in order to enhance their
sensitivity, as well as feedback during the measurement process, i.e., adaptive
protocols. On the one hand, we obtain an ultimate bound on thermometry
precision in the Bayesian setting, valid for arbitrary interactions and
measurement schemes, which lower bounds the error with a quadratic
(Heisenberg-like) scaling with the number of probes. We develop a simple
adaptive strategy that can saturate this limit. On the other hand, we derive a
no-go theorem for non-adaptive protocols that does not allow for better than
linear (shot-noise-like) scaling even if one has unlimited control over the
probes, namely access to arbitrary many-body interactions.Comment: 14 pages with appendice
Hybrid thermal machines: Generalized thermodynamic resources for multitasking
Thermal machines perform useful tasks, such as producing work, cooling, or heating by exchanging energy, and possibly additional conserved quantities such as particles, with reservoirs. Here we consider thermal machines that perform more than one useful task simultaneously, terming these hybrid thermal machines. We outline their restrictions imposed by the laws of thermodynamics and we quantify their performance in terms of efficiencies. To illustrate their full potential, reservoirs that feature multiple conserved quantities, described by generalized Gibbs ensembles, are considered. A minimal model for a hybrid thermal machine is introduced, featuring three reservoirs and two conserved quantities, e.g., energy and particle number. This model can be readily implemented in a thermoelectric setup based on quantum dots, and hybrid regimes are accessible considering realistic parameters.ISSN:2643-156