ExplainerOct 8

Certifying Quantum Memories by Average Channel Fidelity

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A general framework for certifying quantum memories has been presented, together with a demonstration on a solid-state quantum memory, which it certified at an average channel fidelity of 98.6 percent...

AnalysisOct 8

The hardness boundary of redundancy-free Hamiltonians

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A paper deposited on the arXiv takes up the class of redundancy-free Hamiltonians, those for which the trace vanishes for any product of Hamiltonian terms in which at least one term appears an odd num...

AnalysisOct 8

Proposal Would Restrict Quantum Computer Access to Preserve Science, Limit Factoring

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A proposal now before the scientific community would set public access to fault-tolerant quantum computers upon a narrower footing, sacrificing a measure of cryptanalytic reach in order to preserve th...

ExplainerOct 8

Constant-Rate Security for Worst-Case Classical Messages in the Entangled Split-State Model

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The constant-rate question for worst-case classical messages in the entangled two-split-state model has been answered. In that model a codeword is divided into two shares, and two adversaries each tam...

AdvertisementOct 7

THE REGULATING SUMATRAN PLEXUSINE: A Sure Coherent Access Against the Obstructed Ciphers of the Intellect

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Disordered ciphers proceed from a single want: the inner oracle is consulted by halves, through mere classical clerkship, and the qubit ganglia never receive the coherent access by which ordered accid...

ExplainerOct 7

Constant-Rate Certified Deletion: A Unified Framework

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A preprint now on the arXiv proposes a unified framework for certified deletion, and the central fact is quantitative: where earlier constructions consumed a linear number of qubits for each encrypted...

SocietyOct 7

SOCIETY: A Quiet Installation at the House of Mara

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An arrival passed unannounced. Lord Todd of the Bitcoin household now keeps the Slipstream room at the House of Mara, a service entrance where notes are delivered unseen. The room is suddenly fashiona...

AdvertisementOct 7

THE UNCONQUERABLE SIAMESE CIPHERINE: A Fortification Against the Prime Distemper

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Whereas the modern world rests upon the integrity of its encrypted despatches, and whereas the enemies of order have lately obtained the means to dissolve those protections by the abominable agency of...

ExplainerOct 6

Cloudflare announces plans to launch a post-quantum certificate authority

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Cloudflare Inc. has announced plans to establish a public certificate authority that will issue post-quantum certificates: certificates designed to withstand the arrival of encryption-breaking quantum...

FeatureOct 6

Exact T-count of a parallel Toffoli layer: 6m+1 gates

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An exact accounting has at last been given for the cost of a parallel Toffoli layer, the diagonal core of which is a bank of m disjoint CCZ gates. The paper, deposited on the arXiv, proves that such a...

FeatureOct 5

Modular Quantum Error-Correction Proposal Seeks to Curb Qubit Overhead

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Among the preprints now circulating in quantum error correction, one proposes a remedy for the least elegant fact of the field: the planar surface code's appetite for physical qubits. A modular constr...

FeatureOct 5

Two-Round Even-Mansour Is Quantum-Secure in the Ideal Permutation Model

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An open question in the construction of quantum-secure block ciphers has been answered. A paper now in circulation proves that the two-round Even-Mansour cipher, which interleaves public permutations ...