Quantum 7, 964 (2023). https://doi.org/10.22331/q-2023-03-30-964 We develop and analyze a method for simulating quantum circuits on classical computers by representing quantum states as rooted tree tensor networks. Our algorithm first determines a suitable, fixed tree […]
Quantum 7, 963 (2023). https://doi.org/10.22331/q-2023-03-28-963 Semiclassically, laser pulses can be used to implement arbitrary transformations on atomic systems; quantum mechanically, residual atom-field entanglement spoils this promise. Transcoherent states are field states that fix this problem […]
Quantum 7, 962 (2023). https://doi.org/10.22331/q-2023-03-28-962 The implementation of time-evolution operators $U(t)$, called Hamiltonian simulation, is one of the most promising usage of quantum computers. For time-independent Hamiltonians, qubitization has recently established efficient realization of time-evolution […]
Quantum 7, 961 (2023). https://doi.org/10.22331/q-2023-03-23-961 We demonstrate an information erasure protocol that resets $N$ qubits at once. The method displays exceptional performances in terms of energy cost (it operates nearly at Landauer energy cost $kT […]
Quantum 7, 960 (2023). https://doi.org/10.22331/q-2023-03-23-960 The fidelity susceptibility is a tool for studying quantum phase transitions in the Hermitian condensed matter systems. Recently, it has been generalized with the biorthogonal basis for the non-Hermitian quantum […]
Quantum 7, 959 (2023). https://doi.org/10.22331/q-2023-03-23-959 One of the challenges of quantum computers in the near- and mid- term is the limited number of qubits we can use for computations. Finding methods that achieve useful quantum […]
Quantum 7, 958 (2023). https://doi.org/10.22331/q-2023-03-20-958 Field mediated entanglement experiments probe the quantum superposition of macroscopically distinct field configurations. We show that this phenomenon can be described by using a transparent quantum field theoretical formulation of […]
Quantum 7, 957 (2023). https://doi.org/10.22331/q-2023-03-20-957 Isometry operations encode the quantum information of the input system to a larger output system, while the corresponding decoding operation would be an inverse operation of the encoding isometry operation. […]
Quantum 7, 956 (2023). https://doi.org/10.22331/q-2023-03-20-956 As a cornerstone for many quantum linear algebraic and quantum machine learning algorithms, controlled quantum state preparation (CQSP) aims to provide the transformation of $|irangle |0^nrangle to |irangle |psi_irangle $ […]
Quantum 7, 955 (2023). https://doi.org/10.22331/q-2023-03-20-955 The time-marching strategy, which propagates the solution from one time step to the next, is a natural strategy for solving time-dependent differential equations on classical computers, as well as for […]
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