400 BCE
Democritus Proposes Atomism
Greek philosopher Democritus theorizes that all matter consists of indivisible atoms, laying early groundwork for the concept of quantized physical properties. #philosophy #physics
Chronological Storyline (44 Milestones)
1801 CE
Young's Double-Slit Experiment
Thomas Young demonstrates the wave nature of light through interference, later crucial for understanding wave-particle duality and quantum superposition. #physics #experiment
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Dec 14, 1900 CE
Planck's Quantum Hypothesis
Max Planck introduces the concept of energy quanta to explain blackbody radiation, marking the birth of quantum theory. #quantum #physics
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Mar 18, 1905 CE
Einstein's Photoelectric Effect Paper
Albert Einstein proposes that light consists of quanta (photons), explaining the photoelectric effect and establishing particle nature of light. #quantum #physics
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Jul 1, 1913 CE
Bohr Model of the Atom
Niels Bohr introduces a model with quantized electron orbits, incorporating quantum ideas into atomic structure. #quantum #atomic
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1924 CE
de Broglie's Matter Waves
Louis de Broglie proposes that particles have wave-like properties, leading to wave-particle duality. #quantum #physics
Jul 1, 1925 CE
Heisenberg's Matrix Mechanics
Werner Heisenberg formulates matrix mechanics, the first complete quantum theory. #quantum #mechanics
Jan 1, 1926 CE
Schrödinger Equation
Erwin Schrödinger develops wave mechanics and the Schrödinger equation, providing a powerful tool for quantum calculations. #quantum #wave
Mar 1, 1927 CE
Heisenberg's Uncertainty Principle
Heisenberg introduces the uncertainty principle, stating that certain pairs of properties cannot be simultaneously known precisely. #quantum #uncertainty
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Oct 1, 1927 CE
Bohr-Einstein Debates Begin
Niels Bohr and Albert Einstein start their famous debates on the interpretation of quantum mechanics, including entanglement. #quantum #debate
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Mar 25, 1935 CE
EPR Paradox Paper
Einstein, Podolsky, and Rosen propose the EPR paradox, arguing that quantum mechanics is incomplete and introducing 'spooky action at a distance'. #entanglement #paradox
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Aug 1, 1935 CE
Schrödinger's Cat Thought Experiment
Erwin Schrödinger devises the cat-in-a-box paradox to illustrate superposition and entanglement. #quantum #paradox
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1952 CE
Bohm's Hidden Variables Theory
David Bohm proposes a deterministic interpretation of quantum mechanics with hidden variables to resolve the EPR paradox. #quantum #interpretation
1964 CE
Bell's Theorem Published
John Bell proves that no local hidden variable theory can reproduce all quantum mechanical predictions, enabling experimental tests of entanglement. #entanglement #theorem
1972 CE
First Experimental Test of Bell's Inequality
Stuart Freedman and John Clauser perform the first experimental violation of Bell's inequalities, supporting quantum entanglement. #experiment #entanglement
May 1, 1981 CE
First Quantum Teleportation Proposal
Bennett et al. propose a protocol for quantum teleportation using entanglement. #quantum #teleportation
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1982 CE
Aspect's Bell Test Experiments
Alain Aspect performs precise experiments confirming violation of Bell inequalities, closing loopholes and strongly supporting entanglement. #experiment #entanglement
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1984 CE
BB84 Quantum Key Distribution Protocol
Charles Bennett and Gilles Brassard invent the first quantum cryptography protocol, using single photons for secure communication. #quantum #cryptography
1985 CE
Deutsch's Quantum Turing Machine
David Deutsch formulates the concept of a universal quantum computer, establishing quantum computing as a field. #quantum #computing
1991 CE
Ekert's E91 Quantum Cryptography Protocol
Artur Ekert proposes a quantum key distribution protocol based on entanglement. #quantum #cryptography
1993 CE
Bennett et al. Formalize Quantum Teleportation
Bennett, Brassard, Crépeau, Jozsa, Peres, and Wootters publish the formal protocol for quantum teleportation. #quantum #teleportation
1994 CE
Shor's Algorithm for Factoring
Peter Shor develops a quantum algorithm that can factor large numbers exponentially faster than classical algorithms, sparking intense interest in quantum computing. #quantum #algorithm
1995 CE
First Quantum Error Correction Codes
Shor and Steane independently propose quantum error correction, essential for fault-tolerant quantum computing. #quantum #errorcorrection
1996 CE
Grover's Search Algorithm
Lov Grover discovers a quantum algorithm for unstructured search with quadratic speedup. #quantum #algorithm
Dec 1, 1997 CE
Experimental Quantum Teleportation
Bouwmeester et al. demonstrate quantum teleportation of a photon state over short distances. #experiment #teleportation
1998 CE
First Quantum Computation Demonstration
Chuang et al. demonstrate a simple quantum algorithm (Grover's) using NMR on a few qubits. #quantum #computing
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2001 CE
Creation of Greenberger-Horne-Zeilinger (GHZ) States
Experimental creation of three-photon GHZ states, demonstrating multipartite entanglement. #entanglement #experiment
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2004 CE
Long-Distance Quantum Teleportation
Quantum teleportation achieved over 600 meters using free-space photons. #teleportation #experiment
2005 CE
Density Matrix Renormalization Group (DMRG) Applied to Entanglement
DMRG becomes a key tool for studying entanglement in many-body systems. #entanglement #quantum
2007 CE
Topological Quantum Computing Proposal
Kitaev and others propose topological qubits using anyons, offering inherent error resistance. #quantum #topological
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2008 CE
Claytronics: Quantum Entanglement for Programmable Matter
Concept of using entanglement in modular nanoscale robots (claytronics) emerges. #quantum #robotics
2010 CE
Bell Test with Entangled Ions
First Bell inequality violation using trapped ions closing all major loopholes simultaneously. #entanglement #experiment
Jun 1, 2012 CE
Quantum Teleportation Between Two Atoms Over 1 km
Teleportation of quantum states between two atoms separated by 1 km using fiber optics. #teleportation #experiment
2013 CE
Heralded Entanglement Between Distant Ions
Heralded entanglement of two ions separated by 21 meters demonstrated. #entanglement #experiment
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Oct 1, 2015 CE
First Fully Loop-Hole-Free Bell Test
Simultaneous violation of Bell inequalities closing detection and locality loopholes using entangled electron spins. #entanglement #experiment
Aug 16, 2016 CE
Micius Quantum Satellite Launch
China launches the world's first quantum communication satellite, enabling long-distance entanglement distribution. #quantum #satellite
Jun 1, 2017 CE
Quantum Teleportation from Ground to Satellite
Teleportation of photon states from Earth to a satellite in orbit over 1400 km. #teleportation #experiment
2018 CE
First Quantum Internet Demo: Entanglement Over 50 km
Delft University of Technology demonstrates entanglement between three nodes, forming a rudimentary quantum network. #quantum #network
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Oct 23, 2019 CE
Google Claims Quantum Supremacy
Google Sycamore processor performs a calculation in 200 seconds that would take a supercomputer 10,000 years. #quantum #supremacy
Dec 1, 2020 CE
Boson Sampling Achieves Quantum Advantage
Chinese team using photonic quantum computer Jiuzhang demonstrates quantum advantage via boson sampling. #quantum #advantage
2021 CE
Entanglement Distribution Over 1200 km via Satellite
Micius satellite used to distribute entangled photon pairs over 1200 km, enabling global quantum networks. #entanglement #satellite
Oct 4, 2022 CE
Nobel Prize in Physics Awarded for Entanglement
Nobel Prize awarded to Aspect, Clauser, and Zeilinger for experiments with entangled photons, establishing quantum information science. #entanglement #nobel
2023 CE
Quantum Error Correction Below Break-Even Threshold
Multiple groups demonstrate quantum error correction that reduces logical error rates below physical qubit error rates, milestone for fault-tolerant computing. #quantum #errorcorrection
2024 CE
Entanglement-Based Quantum Network Across Cities
Demonstration of a functional quantum network linking multiple metropolitan nodes using entanglement swapping. #quantum #network