Quantum Cryptography Approaching the Classical Limit by Weedbrook, Christian, Pirandola, Stefano, Lloyd, Seth, Ralph, Timothy C.

“…We consider the security of continuous-variable quantum cryptography as we approach the classical limit, i.e., when the unknown preparation noise at the sender’s station becomes significantly noisy or thermal (even by as much as 10 (superscript 4) times greater than the variance of the vacuum mode). …”
Get full text

Efficient classical algorithms for simulating symmetric quantum systems by Anschuetz, Eric R., Bauer, Andreas, Kiani, Bobak T., Lloyd, Seth

“…In light of recently proposed quantum algorithms that incorporate symmetries in the hope of quantum advantage, we show that with symmetries that are restrictive enough, classical algorithms can efficiently emulate their quantum counterparts given certain classical descriptions of the input. …”
Get full text

Quantum-Locked Key Distribution at Nearly the Classical Capacity Rate by Lupo, Cosmo, Lloyd, Seth

“…Quantum data locking is a protocol that allows for a small secret key to (un)lock an exponentially larger amount of information, hence yielding the strongest violation of the classical one-time pad encryption in the quantum setting. …”
Get full text
Get full text

Horizons of Artificial Intelligence in Quantum Computation by Kiani, Bobak T.

“…Motivated by the success of deep neural networks in classical machine learning, a prevailing hope is that such success will translate to so-called quantum variational algorithms or quantum neural networks inspired by their classical counterparts. …”
Get full text

Measuring magic on a quantum processor by Oliviero, Salvatore F. E., Leone, Lorenzo, Hamma, Alioscia, Lloyd, Seth

“…Magic states are the resource that allows quantum computers to attain an advantage over classical computers. This resource consists in the deviation from a property called stabilizerness which in turn implies that stabilizer circuits can be efficiently simulated on a classical computer. …”
Get full text

An efficient quantum algorithm for spectral estimation by Eisert, Jens, Steffens, Adrian, Rebentrost, Frank, Marvian Mashhad, Iman, Lloyd, Seth

“…Our algorithm features an efficient quantum–classical division of labor: the time-critical steps are implemented in quantum superposition, while an interjacent step, requiring much fewer parameters, can operate classically. …”
Get full text
Get full text

Artificial Neural Networks for Programming Quantum Annealers by Bosch, Samuel

“…It has the potential to enable advances in artificial intelligence, such as solving problems intractable on classical computers. Some of the fundamental ideas behind quantum machine learning are very similar to kernel methods in classical machine learning. …”
Get full text

Sequential Projective Measurements for Channel Decoding by Lloyd, Seth, Giovannetti, Vittorio, Maccone, Lorenzo

“…We study the transmission of classical information in quantum channels. We present a decoding procedure that is very simple but still achieves the channel capacity. …”
Get full text

Quantum Generative Adversarial Learning by Lloyd, Seth, Weedbrook, Christian

“…Generative adversarial networks represent a powerful tool for classical machine learning: a generator tries to create statistics for data that mimics those of a true data set, while a discriminator tries to discriminate between the true and fake data. …”
Get full text

Direct and Reverse Secret-Key Capacities of a Quantum Channel by Braunstein, Samuel L., Garcia-Patron Sanchez, Raul, Lloyd, Seth, Pirandola, Stefano

“…We define the direct and reverse secret-key capacities of a memoryless quantum channel as the optimal rates that entanglement-based quantum-key-distribution protocols can reach by using a single forward classical communication (direct reconciliation) or a single feedback classical communication (reverse reconciliation). …”
Get full text

Analog Quantum Variational Embedding Classifier by Yang, Rui, Bosch, Samuel, Kiani, Bobak, Lloyd, Seth, Lupascu, Adrian

“…For current noisy intermediate-scale quantum computers, various quantum-classical hybrid algorithms have been proposed. One such previously proposed hybrid algorithm is a gate-based variational embedding classifier, which is composed of a classical neural network and a parameterized gate-based quantum circuit. …”
Get full text

Information Theoretical Analysis of Quantum Optimal Control by Montangero, S., Lloyd, Seth

“…We study the relations between classical information and the feasibility of accurate manipulation of quantum system dynamics. …”
Get full text

Quantum Data Hiding in the Presence of Noise by Lupo, Cosmo, Wilde, Mark M., Lloyd, Seth

“…When classical or quantum information is broadcast to separate receivers, there exist codes that encrypt the encoded data, such that the receivers cannot recover it when performing local operations and classical communication, but they can reliably decode if they bring their systems together and perform a collective measurement. …”
Get full text
Get full text

Quantum Optical Temporal Phase Estimation by Homodyne Phase-Locked Loops by Tsang, Mankei, Shapiro, Jeffrey H., Lloyd, Seth

“…Using classical estimation techniques, we design homodyne phase-locked loops for optical temporal phase and instantaneous frequency measurements at the quantum limit.…”
Get full text
Get full text
Get full text

Quantum Enigma Machines and the Locking Capacity of a Quantum Channel by Guha, Saikat, Hayden, Patrick, Krovi, Hari, Lloyd, Seth, Lupo, Cosmo, Shapiro, Jeffrey H., Takeoka, Masahiro, Wilde, Mark M.

“…In any case, the locking effect represents an extreme violation of Shannon’s classical theorem, which states that information-theoretic security holds in the classical case if and only if the secret key is the same size as the message. …”
Get full text
Get full text
Get full text

Quantum advantage for differential equation analysis by Kiani, Bobak Toussi, De Palma, Giacomo, Englund, Dirk, Kaminsky, William, Marvian, Milad, Lloyd, Seth

“…These quantum algorithms provide an exponential advantage over existing classical Monte Carlo methods.…”
Get full text

Quantum advantage in postselected metrology by Arvidsson-Shukur, David RM, Yunger Halpern, Nicole, Lepage, Hugo V, Lasek, Aleksander A, Barnes, Crispin HW, Lloyd, Seth

“…This advantage, we prove, is unrealizable in any classically commuting theory. Finally, we construct a preparation-and-postselection procedure that yields an arbitrarily large Fisher information. …”
Get full text

Quantum advantage in postselected metrology by Arvidsson-Shukur, David RM, Yunger Halpern, Nicole, Lepage, Hugo V, Lasek, Aleksander A, Barnes, Crispin HW, Lloyd, Seth

“…This advantage, we prove, is unrealizable in any classically commuting theory. Finally, we construct a preparation-and-postselection procedure that yields an arbitrarily large Fisher information. …”
Get full text

Quantum Algorithm for Linear Systems of Equations by Lloyd, Seth, Hassidim, Avinatan

“…In this case, when A is sparse, N×N and has condition number κ, the fastest known classical algorithms can find x⃗ and estimate x⃗†Mx⃗ in time scaling roughly as N√κ. …”
Get full text

Reverse Coherent Information by Lloyd, Seth, Pirandola, Stefano, Shapiro, Jeffrey H., Garcia-Patron Sanchez, Raul

“…In this Letter we define a family of entanglement distribution protocols assisted by feedback classical communication that gives an operational interpretation to reverse coherent information, i.e., the symmetric counterpart of the well-known coherent information. …”
Get full text
Get full text