Science – Page 41 – Investment Policy

Verifying Quantum States with a Minimal Measurement Burden

12.11.2025 by Ray Dalio

The protocol operates by partitioning a global quantum system, discarding select subsystems, and certifying the remaining components—leaving a single component for further analysis—a strategy designed to navigate adversarial proofs through selective measurement and focused computation.

A new protocol efficiently certifies complex quantum states using only a small number of single-qubit Pauli measurements.

Unlocking Quantum Speedup: A New Way to Measure Coherence

11.11.2025 by Ray Dalio

$The efficacy of a generalized Bernstein-Vazirani algorithm hinges on maintaining quantum coherence—specifically, both state coherence, representing the preservation of superposition, and operator coherence, dictating the fidelity of quantum gate operations—as diminished coherence directly impacts the algorithm’s success probability, a relationship explored through quantifying the coherence fraction.$

Researchers quantify coherence in quantum algorithms, revealing its impact on performance with the Bernstein-Vazirani algorithm.

Encoding Quantum Data with Squeezed Light

11.11.2025 by Ray Dalio

A new approach to protecting quantum information leverages the unique properties of squeezed vacuum states.

Squeezing More Logic from Qubits

11.11.2025 by Ray Dalio

$The attempted suppression of hook error propagation within a densely packed surface code—achieved through meticulous gate scheduling—reveals an inherent limitation: even localized regions susceptible to logical-direction error propagation ($ \rightarrow $), despite representing only a fraction of the total system, foreshadow the inevitable emergence of systemic failure as the code scales.$

New techniques dramatically reduce the physical qubit overhead for fault-tolerant quantum computing with surface codes.

Encoding Logic with Quantum Error Correction

11.11.2025 by Ray Dalio

A new approach utilizes high-rate quantum LDPC codes to enable efficient, addressable gate-based computation.

Quantum Computing’s Flexible Future: ReQISC Redefines Control

11.11.2025 by Ray Dalio

ReQISC establishes a system for engineering arbitrary SU(4) gates through a time-optimal microarchitecture and a three-stage compilation framework, ultimately expressing this functionality via the {Can, U3} gate set—a foundational step towards programmable quantum computation.

A new full-stack framework promises to optimize quantum computations by tightly integrating hardware and software design.

Beyond Qubits: Encoding More Information in Quantum Systems

11.11.2025 by Ray Dalio

A logical qudit encoding—as demonstrated by the required Hilbert space—offers a potentially more efficient pathway to fault-tolerant quantum computation compared to conventional methods mapping information onto multiple logical qubits, a benefit that scales with qudit dimension and codeword distance.

A new approach to quantum error correction leverages ‘qudits’ – quantum units beyond simple 0 or 1 – to dramatically improve resource efficiency.

Shielding Quantum Signals from Noise

11.11.2025 by Ray Dalio

A new approach to quantum error correction promises to safeguard fragile quantum information from both thermal and environmental disturbances.

Terahertz Quantum Security: A New Wireless Frontier

11.11.2025 by Ray Dalio

Within a 3x3 MIMO configuration utilizing the CVMDI protocol and phase modulation, Alice and Bob decompose the original multiple-input multiple-output channel into parallel single-input single-output channels via transmit and receive beamforming, enabling communication across a terahertz wireless channel subject to free-space propagation and associated noise variances.

Researchers demonstrate a secure quantum communication system operating at Terahertz frequencies, paving the way for high-bandwidth, unhackable wireless networks.

Scaling the Quantum Frontier: Meet Helios

10.11.2025 by Ray Dalio

Within the Helios 2D surface trap, ninety-eight atomic ions—arranged in a quincunx—become visible only when coaxed into resonance by laser light, a demonstration of how even the most fundamental particles yield their secrets only through carefully calibrated interaction, and betray the hand of the physicist who designed the trap itself.

A 98-qubit trapped-ion processor pushes the limits of quantum computation with a novel architecture and robust performance.