![\"High](\"https:\/\/www.newsbeep.com\/uk\/wp-content\/uploads\/2026\/02\/high-definition-telesc-1-1200x1075.jpg.webp.webp\")
(a) A two-telescope array of baseline b points toward two weakly emitting stars of angular separation 2\u03b8. A star photon arriving at site A is shown. (b) The incoming photon is fed into a spatial mode demultiplexer (SPADE). An excitation is shown to occur in the second mode basis and in the fifth time bin of a block of integration time in which roughly one photon arrives. (c) The photonic state is loaded onto the memory qubits via photonmemory CNOT gates, a compressive binary encoding, and performing X-basis measurements on the photon. (d) Entangled pairs predistributed among the telescope sites assist in performing a sequence of operations that reveal the arrival time and spatial mode index, which, combined with (e) the X measurement results of relevant memory atoms, results in a single-bit postprocessed outcome whose empirical probability over measurements of many time blocks containing one photon each is the sufficient statistic to estimate \u03b8 at the QFI-mandated precision limit. Credit: Padilla et al. (PRL, 2026).<\/p>\n
For over a decade, the team has explored the fundamental limits of resolution in optical imaging, seeking answers to essential astronomical questions. These questions include, \u201cHow far apart are those two stars?\u201d and \u201cHas a known object undergone a change?\u201d Through this lens, they have redefined the limits of what can be resolved in the vast expanse of the universe, showing that what was once considered unresolvable could actually be observed using quantum techniques.<\/p>\n
Overcoming Traditional Limits of Interferometry<\/p>\n
Historically, astronomers have combined the light from multiple telescopes through an interferometer to produce sharper images of distant objects. However, this method relies on physically transporting light signals to a central location, a task that becomes increasingly difficult as the distance between telescopes grows. The breakthrough proposed by Dr. Guha and his colleagues replaces this complex process with quantum entanglement.<\/p>\n
Dr. Guha further elaborates, <\/p>\n
\u201cWe knew that coordinated telescopes situated across long distances, looking at the same scene, could mimic a telescope whose diameter is as big as the distance separating them, and are hence capable of resolving much finer grained details of a scene.\u201d <\/p>\n
This understanding formed the basis of their new technique, which leverages the power of entanglement to link distant telescopes, enabling them to share quantum states without the need for physical light transportation.<\/p>\n
The Quantum Solution: Entanglement Without Physical Links<\/p>\n
Quantum entanglement enables two distant parties to share a correlated quantum state, which can be utilized to perform precise measurements on distant objects. According to Dr. Guha,<\/p>\n
\u201cQuantum mechanics allows for two distant parties to share entanglement\u2014a form of correlation that is stronger than any probabilistic correlation allowed by physics.\u201d <\/p>\n
This entanglement is stored in quantum memories located at each telescope site, allowing the telescopes to work in tandem as part of a larger quantum network.<\/p>\n
![\"High](\"https:\/\/www.newsbeep.com\/uk\/wp-content\/uploads\/2026\/02\/high-definition-telesc-1200x558.jpg.webp.webp\")
CFI normalized to the QFI, plotted as a color chart, versus separation \u03b8=\u03c3 and baseline to aperture-diameter ratio r. Four values of the spatial-mode cutoff K are shown, with the top right corresponding to a binary SPADE (K \u00bc 2) attaining the QFI in the sub-Rayleigh regime (\u03b8=\u03c3 < 1). Credit: Padilla et al. (PRL, 2026).<\/p>\n
Using this method, researchers can perform measurements on the collective light gathered by the telescopes without ever bringing the light together in one place. Dr. Guha describes the achievement: \u201cWe came up with a way to perform the pairwise combining of the locally sorted starlight at each telescope in an array of beamsplitters, but without any physical beamsplitter, and without ever physically bringing the light from the two telescopes to one location.\u201d This innovative technique opens the door for far more precise and efficient astronomical observations. <\/p>\n
Quantum Imaging: Potential Applications in Astrophysics<\/p>\n