Algorithmic Wave-Particle Duality: Pathfinding in Welded Trees is Hard reports a quantum query complexity of ~Θ(2^{n/3}) for finding a root-to-root path. The result matches the cost of a quantum algorithm that finds collisions between paths from each root to the weld.
Key points
Quantum query complexity for pathfinding is ~Θ(2^{n/3}) for trees of height n.
The bound is tight, matching the cost of a quantum collision-finding algorithm.
Sources
Sample-based Diagonalization via DMRG, sub-kcal/mol
SqDMRG merges sample-based quantum diagonalization with the density matrix renormalization group. It reaches sub-kcal/mol accuracy while using far fewer configurations than direct diagonalization. Demonstrations include benzene pentamer and decamer clusters with classical samples and a pentamer with quantum samples from IBM Quantum Nighthawk r2.
Key points
Combines SQD and DMRG into SqDMRG.
Tested on benzene pentamer and decamer clusters using classical reference samples.
Achieves sub-kcal/mol accuracy with far fewer configurations than direct diagonalization.
Sources
Superradiant laser achieves Θ(μ^{8/3}) coherence scaling
Superradiant laser reaches coherence scaling Θ(μ^{8/3}) in the optimal parameter regime, surpassing the standard quantum limit. The work introduces generalized far-above-threshold laser models with a collective lowering operator. It shows that in the bad-cavity limit μ≈N/2, where N is the atom count.
Key points
Heisenberg limit for laser coherence is Θ(μ⁴).
The proposed model uses the collective superradiant lowering operator (\hat{J}).
Coherence can scale as Θ(μ^{8/3}) in the optimal regime.
In the bad-cavity limit the mean excitation number μ approximates N/2.
Sources
Trinetra.Q – detection layer for QEC and control stack attacks
Trinetra.Q introduces a detection layer that monitors statistical and behavioral properties of quantum-error-correction data and the classical control stack, raising alerts only on statistically significant deviations. The system includes detectors for QEC integrity, decoder confidence, output divergence, control-stack tampering via canary circuits, and compilation/execution integrity, and is evaluated on three production IBM Heron processors.
Key points
Detectors monitor per-stabilizer firing rates, syndrome defect-count, and repeated-syndrome rate for QEC integrity.
Control-stack tampering is checked with known-answer canary circuits and a cross-job consistency statistic.
Sources
Rotated-Frame Determinant Discovery for Ground- and Excited-State QSCI reduces shot count
Rotated-Frame Determinant Discovery for Ground- and Excited-State Quantum Selected Configuration Interaction introduces a rotate-sample-unrotate (RSU) scheme that lowers required measurement shots. For N₂ at stretched geometry, RSU reaches chemical accuracy with 5,000 shots versus 20,000 shots for conventional QSCI.
Key points
RSU samples the same state in complementary orbital frames and generates candidate determinants in the canonical basis.
For excited states, RSU is combined with the generative quantum eigensolver (GQE) to prepare target-specific sampling states.
Sources
Lipfendra first oral PCSK9 inhibitor launch announced
Lipfendra is introduced as the first oral PCSK9 inhibitor to prevent arterial plaque buildup. It reports dramatic reductions in LDL, ApoB and Lp(a).
Key points
First oral PCSK9 inhibitor to prevent arterial plaque buildup.
Dramatic reductions seen in LDL, ApoB and Lp(a).
Sources
- Original post
- Lifespan - Linked page
Quantum Key Exchange from Public Quantum Money – equivalence of 2QKE primitives
Quantum Key Exchange from Public Quantum Money presents a complete characterization of two-message quantum key exchange (2QKE). It shows that everlasting-secure 2QKE, standard 2QKE, efficiently-verifiable state puzzles, and one-time secure digital signatures with quantum signatures are existentially equivalent. The work also links one-shot signatures, quantum lightning, and public-key quantum money mini-schemes to these primitives.
Key points
Everlasting-secure 2QKE, standard 2QKE, EV-StatePuzzs, and one-time secure quantum signatures are existentially equivalent.
One-shot signatures imply QPKE with quantum public keys and provide a certified freeze functionality.
Sources
- Original post
- Quantum Key Exchange from Public Quantum Money - Linked page
Efficiently tracking errors and outcomes in universal quantum circuits
Efficiently tracking errors and outcomes in universal quantum circuits presents a method for efficient simulation of error propagation and decoding in universal fault-tolerant quantum circuits under stochastic Pauli noise. The technique uses a modified Pauli frame that contains no logical information and verifies decoding success by checking that the frame remains logically trivial.
Key points
Modified Pauli frame-based error tracking contains no logical information.
Decoding success is identified by verifying that the Pauli frame is still logically trivial after decoding.
