Browsing by Author "Orszag, Miguel"

Now showing 1 - 7 of 7
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    Amplification of mechanical quadratures using weak values
    (2022) Carrasco, Sergio; Orszag, Miguel
    An interferometric arrangement is proposed in which the technique of weak value amplification is implemented in order to enlarge the effect of a single photon on the quadratures of a movable mirror of an optical cavity. The photon interacts weakly with the mirror via radiation pressure and is postselected in the dark port of the interferometer. The real and imaginary parts of weak values of angular momentum type photonic operators produce an amplification of the mirror quadratures, which is large as compared to the scenario in which all photons are taken into consideration, i.e. when no postselection is performed. The effect is studied both for a mirror initialized in a thermal and coherent states. For a thermal state, the weak value amplification effect is boosted with the number of particles of the mirror, which occurs due to the imaginary part of the weak values.
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    Controlling parameters of the wave-particle duality of a two-level atom in a double-slit scheme with cavity field
    (2021) Miranda, Mario; Orszag, Miguel
    A double-slit scheme placed immediately before a standing wave allows one to establish two possible paths for the passage of an atom. Each path matches with a node or antinode of the wave. The atom-field interaction is maximum (null) when the atom crosses an antinode (node), causing a maximum (null) phase shift in the field. Therefore, after the interaction, a proper quadrature measurement on the field can reveal the value of its final phase, and which-path information can be obtained. For a coherent state, the which-path information can be controlled by the amplitude of the field, and partial interference can be observed as it decreases. In this paper, we consider different states of the quantum field (squeezed coherent, cat, and thermal states), and we establish correlations between the internal atomic states and the paths of the double-slit scheme. This allows us to study the relationship among visibility, distinguishability, and concurrence, having in both the field and the atom different controlling parameters of the wave-particle duality. (C) 2021 Optical Society of America
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    Estimation of an optomechanical parameter via weak-value amplification
    (2022) Carrasco, Sergio; Orszag, Miguel
    In this article we present an experimental proposal for the estimation of an optomechanical parameter in the presence of noise. The estimation is based on the technique of weak-value amplification which can enlarge the radiation pressure effect of a single photon on a mechanical oscillator. In our setup we show that the weak value amplification technique is preferable for the estimation over a method that relies on a strong measurement with postselection because the first method does not require a good prior knowledge of the parameter we wish to estimate, while both strategies reach the same level of precision from a Fisher information perspective. In the presence of strongly correlated noise, the weak-value amplification method is preferable, from a Fisher information perspective, than a standard measurement strategy that does not employ postselection and that is affected by the same type of noise.
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    Generation of entanglement via squeezing on a tripartite-optomechanical system
    (2023) Araya-Sossa, Kevin; Orszag, Miguel
    We introduce a strategy to regulate the quantum entanglement in a dispersive-hybrid system where a qubit is directly coupled to a cavity and a resonator. A dramatic transition takes place by only tuning the squeezing parameters associated with the vibrational mode. As the squeezing amplitude becomes larger, the maximal entanglement abruptly falls to zero at specific squeezing phases. It is also possible to generate entanglement for bipartitions from the qubit-cavity-resonator system after applying this strategy. Entangled qubit-cavity states are created through squeezing, even though there is no direct interaction between them. We also analyze the effect of atomic, optical, and vibrational losses on the quantum entanglement. Finally, we discuss future realizations to implement all these ideas and promote further studies to generalize the concept of monogamy in tripartite systems outside qubit-composite states, in particular, (2 circle times 2 circle times n)-dimensional systems.
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    High-fidelity synchronization and transfer of quantum states in optomechanical hybrid systems
    (2022) Molinares, Hugo; Eremeev, Vitalie; Orszag, Miguel
    In a hybrid scheme, consisting of a three-level atom-cavity-oscillator system, we show that synchronization [J. Czartowski, R. Muller, K. Zyczkowski, and D. Braun, Phys. Rev. A 104, 012410 (2021)] and transfer of nonclassical states between the mechanical oscillator and the cavity field is possible. In this framework, we show that an initially thermalized mechanical oscillator, when connected to a squeezed bath, evolves to a squeezed state which in steady state is synchronized with the cavity mode. On the other hand, if the mechanical oscillator is initially prepared in a nonclassical state, e.g., squeezed and Schrodinger's cat states, while the cavity is in a thermal state, then a periodic transfer between the mechanical oscillator and cavity mode occurs for given interaction times. As qualitative results, we prove that the synchronization and transfer of the quantum states are feasible with high fidelity.
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    Influence of squeezing on the weak-to-strong measurement transition
    (2021) Araya-Sossa, Kevin; Orszag, Miguel
    In this work, we study the measurement transition for a coherent squeezed pointer state through a transition factor Gamma that involves a system-pointer coupling by using an arbitrary measured observable A. In addition, we show that the shift in the pointer's position and momentum establishes a relationship with a new value defined as the transition value, which generalizes the weak value as well as the conditional expectation value. Furthermore, a strategy is introduced to achieve different measurement regimes by just adjusting the r and phi(xi) parameters of the coherent squeezed pointer state, opening an interesting way to test quantum mechanics foundations. Our scheme has been theoretically applied in a trapped ion illuminated by a bichromatic laser beam, with a high potential to be implemented in future experimental setups.
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    Phonon trapping states as a witness for generation of phonon blockade in a hybrid micromaser system
    (2022) Molinares, Hugo; Eremeev, Vitalie; Orszag, Miguel
    In a hybrid micromaser system consisting of an optical cavity with a moving mirror connected to a low-temperature thermal bath, we demonstrate, both analytically and numerically, that for certain interaction times between a random atomic flux and the optomechanical cavity, vacuum phonon trapping states are generated. Furthermore, under the approach of the master equation with independent phonon and photon thermal baths, we show that the trapping of the phonons and photons is achieved for the same interaction times. The results also indicate that by increasing the cavity-oscillator coupling, one may generate a coherent phonon state aside from the trapping states. Within the same hybrid system, but now connected to the squeezed phonon reservoir, a phonon blockade effect can be engineered. Moreover, we identify an interconnection between the trapping and blockade effects, particularly if one approaches the vacuum trapping state, strong phonon blockade can be achieved when the system is connected with a weakly squeezed phonon reservoir.