Tunable passive squeezing of squeezed light through unbalanced double homodyne detection
- URL: http://arxiv.org/abs/2512.08540v1
- Date: Tue, 09 Dec 2025 12:36:55 GMT
- Title: Tunable passive squeezing of squeezed light through unbalanced double homodyne detection
- Authors: Niels Tripier-Mondancin, David Barral, Ganaël Roeland, Raúl Leonardo Rincon Celis, Yann Bouchereau, Nicolas Treps,
- Abstract summary: We show that double homodyne detection can serve as more than a passive measurement apparatus.<n>We experimentally realize this technique using a robust polarization-encoded double homodyne detection to characterize a squeezed vacuum state.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: The full characterization of quantum states of light is a central task in quantum optics and information science. Double homodyne detection provides a powerful method for the direct measurement of the Husimi Q quasi-probability distribution, offering a complete state representation in a simple experimental setting and a limited time frame. Here, we demonstrate that double homodyne detection can serve as more than a passive measurement apparatus. By intentionally unbalancing the input beamsplitter that splits the quantum signal, we show that the detection scheme itself performs an effective squeezing or anti-squeezing transformation on the state being measured. The resulting measurement directly samples the Q function of the input state as if it were acted upon by a squeezing operator whose strength is a tunable experimental parameter : the beamsplitter's reflectivity. We experimentally realize this technique using a robust polarization-encoded double homodyne detection to characterize a squeezed vacuum state. Our results demonstrate the controlled deformation of the measured Q function's phase-space distribution, confirming that unbalanced double homodyne detection is a versatile tool for simultaneous quantum state manipulation and characterization.
Related papers
- Statistical properties of quantum jumps between macroscopic states of light: reading an operational coherence record [0.0]
We propose an experimental apparatus to reveal the quantum coherence manifested in downward quantum jumps of amplitude bistability.<n>The underlying coherent superposition of macroscopic quantum states is translated into the statistical properties of the integrated charge deposited in the detector circuit.
arXiv Detail & Related papers (2025-12-08T17:38:22Z) - Multimode Bosonic State Tomography with Single-Shot Joint Parity Measurement of a Trapped Ion [3.8758525789991896]
We demonstrate a novel scheme for reconstructing a continuous-variable quantum state using the direct single-shot measurement of the joint parity of the phonon states of a trapped ion.<n>We show that the single-shot joint parity measurement can be used to detect parity-flip errors in real time.
arXiv Detail & Related papers (2025-06-14T21:05:06Z) - Evolution of many-body systems under ancilla quantum measurements [58.720142291102135]
We study the concept of implementing quantum measurements by coupling a many-body lattice system to an ancillary degree of freedom.
We find evidence of a disentangling-entangling measurement-induced transition as was previously observed in more abstract models.
arXiv Detail & Related papers (2023-03-13T13:06:40Z) - Experimentally determining the incompatibility of two qubit measurements [55.41644538483948]
We describe and realize an experimental procedure for assessing the incompatibility of two qubit measurements.
We demonstrate this fact in an optical setup, where the qubit states are encoded into the photons' polarization degrees of freedom.
arXiv Detail & Related papers (2021-12-15T19:01:44Z) - Determination of weak squeezed vacuum state through photon statistics
measurement [4.064808764676522]
Weak squeezed vacuum light plays an important role in quantum storage and generation of various quantum sources.
General homodyne detection (HD) cannot determine weak squeezing due to the low signal to noise ratio and the limited resolution of the HD system.
This method can be used to measure other quantum features for various quantum states with extremely weak non-classicality.
arXiv Detail & Related papers (2021-12-07T12:55:11Z) - Visualizing spinon Fermi surfaces with time-dependent spectroscopy [62.997667081978825]
We propose applying time-dependent photo-emission spectroscopy, an established tool in solid state systems, in cold atom quantum simulators.
We show in exact diagonalization simulations of the one-dimensional $t-J$ model that the spinons start to populate previously unoccupied states in an effective band structure.
The dependence of the spectral function on the time after the pump pulse reveals collective interactions among spinons.
arXiv Detail & Related papers (2021-05-27T18:00:02Z) - Superposition of two-mode squeezed states for quantum information
processing and quantum sensing [55.41644538483948]
We investigate superpositions of two-mode squeezed states (TMSSs)
TMSSs have potential applications to quantum information processing and quantum sensing.
arXiv Detail & Related papers (2021-02-01T18:09:01Z) - The BB84 quantum key distribution using conjugate homodyne detection [0.0]
A conjugate homodyne detection system can simultaneously measure a pair of conjugate quadratures X and P of the incoming quantum state.
We show that a blind application of the standard security proof could result pessimistic QKD performance.
This study may open the door to a new family of QKD protocols, in to the well-established DV-QKD based on single photon detection and CV-QKD based on coherent detection.
arXiv Detail & Related papers (2020-08-10T14:13:55Z) - Neural network quantum state tomography in a two-qubit experiment [52.77024349608834]
Machine learning inspired variational methods provide a promising route towards scalable state characterization for quantum simulators.
We benchmark and compare several such approaches by applying them to measured data from an experiment producing two-qubit entangled states.
We find that in the presence of experimental imperfections and noise, confining the variational manifold to physical states greatly improves the quality of the reconstructed states.
arXiv Detail & Related papers (2020-07-31T17:25:12Z) - Quantum Zeno effect appears in stages [64.41511459132334]
In the quantum Zeno effect, quantum measurements can block the coherent oscillation of a two level system by freezing its state to one of the measurement eigenstates.
We show that the onset of the Zeno regime is marked by a $textitcascade of transitions$ in the system dynamics as the measurement strength is increased.
arXiv Detail & Related papers (2020-03-23T18:17:36Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.