22 problems

For an even cycle of size $N$ and depth $p$ satisfying $2p+2\leq N$, is the optimal QAOA approximation ratio for MaxCut exactly …

Are Werner states in arbitrary dimension ever two-copy distillable when they are not one-copy distillable?

Can one construct a plain-model, efficient, information-theoretically secure one-time unclonable-encryption scheme for one classical bit with exponentially small adversarial advant…

Can efficient one-bit quantum encryption prevent an adversary from producing two systems that both reveal the plaintext after the key is disclosed?

Can a single fixed cost operator turn coupling-based quantum optimal transport into a metric, or square-root metric, on the full quantum state space?

Is the Keyl–Werner weak-Schur-sampling estimator asymptotically optimal for learning the spectrum of an unknown $d$-dimensional quantum state?

Is the standard thermal-state lower bound optimal among Gaussian inputs to a bosonic thermal attenuator, and can non-Gaussian inputs transmit quantum information in a strictly larg…

Which unital qubit channels make every collection of output measurements jointly measurable, and do the projective-measurement and general-POVM thresholds coincide?

Does high-temperature quantum correlation decay extend to higher-dimensional geometrically local systems throughout the zero-free regime without imposing logarithmic separation bet…

Do long-range quantum spin systems exhibit a system-size-independent, constant-temperature transition above which every Gibbs state is separable, and what is the sharp dependence o…

Does bipartite classical bound information exist: correlations with positive secrecy cost but zero distillable secret-key rate?

What is the optimal uniform continuity bound for quantum conditional entropy in terms of trace distance and the dimension of the conditioned system alone?

Can a complete edge-coloured, complex-weighted graph be chosen so that perfect-matching amplitudes equal one for every monochromatic inherited vertex colouring and vanish for every…

Can the search for an interpretable photonic experiment that prepares a prescribed quantum state be formulated and solved exactly, rather than relying only on continuous optimizati…

Can the Mean King’s quantum retrodiction puzzle be implemented beyond qubits with a scalable photonic scheme that retains a clear advantage over the best classical strategy?

How can one manipulate and control the general case of $n$-photon, $d$-dimensional quantum states with experimentally meaningful photonic transformations?

Can one automatically discover a human-readable program that generates correct quantum-optical experiments for every size in a state family, including families for which no constru…

Can essential multiphoton gates be implemented non-locally between spatially separated photons without sending the photons to one location, pre-sharing entanglement, or performing…

For four particles and local dimension $D\geq4$, can a complete edge-coloured, complex-weighted graph have unit amplitude for every monochromatic inherited colouring and zero ampli…

Can $\operatorname{AME}(11,4)$ be realized by an explicit circulant graph-state construction?

Does an absolutely maximally entangled state of eleven local systems of dimension five exist?

For every finite two-player entangled game $G$ with $\omega^*(G)<1$, must $\omega^*(G^{\otimes n})$ decay exponentially in $n$?