Realizing distance-selective interactions in a Rydberg-dressed atom array

Abstract

Measurement-based quantum computing relies on the rapid creation of large-scale entanglement in a register of stable qubits. Atomic arrays are well suited to store quantum information, and entanglement can be created using highly-excited Rydberg states. Typically, isolating pairs during gate operation is difficult because Rydberg interactions feature long tails at large distances. Here, we engineer distance-selective interactions that are strongly peaked in distance through off-resonant laser coupling of molecular potentials between Rydberg atom pairs. Employing quantum gas microscopy, we verify the dressed interactions by observing correlated phase evolution using many-body Ramsey interferometry. We identify atom loss and coupling to continuum modes as a limitation of our present scheme and outline paths to mitigate these effects, paving the way towards the creation of large-scale entanglement.

Fast spin squeezing by distance-selective long-range interactions with Rydberg molecule dressing

“…The controllable interaction and dephasing furthermore open opportunities to simulate interesting many-body dynamics, complementary to other studies that aim at the creation of exotic phases and many-body states [72][73][74][75]. We note that a recent experiment has demonstrated the distance selection interaction in an atom array [76], where the ground state atom is dressed to Rydberg macrodimers [77]. Our scheme offers the flexibility to engineer the dressed interaction through tuning the MW field [58].…”

Fast spin squeezing by distance-selective long-range interactions with Rydberg molecule dressing

“…The controllable interaction and dephasing furthermore opens opportunities to quantum simulate interesting many-body dynamics, complementary to other studies that aim at the creation of exotic phases and manybody states [72][73][74][75]. We note that a recent experiment has demonstrated the distance selection interaction in an atom array [76], where the ground state atom is dressed to Rydberg macrodimers [77]. Our scheme offers the flexibility to engineer the dressed interaction through tuning the MW field [58].…”

Practical and fundamental limits of neutral atom entanglement using Rydberg dressing

“…We show here that by going beyond the perfect blockade regime one can use adiabatic dressing to reach the fundamental scaling of entanglement fidelity [31]. Such an approach may become more feasible, e.g., using bound states of doubly excited Rydberg macrodimers [32] that have been well resolved [32,33], and can be employed for such coherent control of entanglement [33]. In addition we find that one can implement entangling gates in the weak blockade regime using a dressing scheme that requires only a limited population in the doubly excited Rydberg state, unlike other protocols for entangling gates [2,3,11,12].…”